DCI Directives

For Official Use Only

MANUAL

TABLE OF CONTENTS

1 INTRODUCTION

1.A    Purpose and Content
1.B    Applicability
1.C    Administration
1.D    Background
1.E    System Information Collection
1.F    How To Use This Manual
1.G    Use of Cryptography
1.H    General Notes

2.A    Overview

2.A.1    Separation of Roles
2.A.2    Applicability

2.B    Roles and Responsibilities

2.B.1    Special Provision for Waivers of Citizenship Requirements.
2.B.2    Principal Accrediting Authority
2.B.3    Data Owner
2.B.4    Designated Accrediting Authority
2.B.5    Designated Accrediting Authority Representative (DAA Rep)
2.B.6    Information System Security Manager (ISSM)
2.B.7    Information System Security Officer (ISSO)
2.B.8    Privileged Users
2.B.9    General Users

3.A    Overview

3.A.1    Conformance with technical security requirements
3.A.2    Non-Multi-User Systems

3.B    Description of Levels-of-Concern

3.B.1    Overview
3.B.2    Determining the Level-of-Concern

3.C    Protection Levels

3.C.1    Protection Level Overview
3.C.2    Determining Protection Levels

3.D    Determining Security Features and Assurances

4.A    Overview

4.B    Confidentiality Requirements

4.B.1    Protection Level 1
4.B.2    Protection Level 2
4.B.3    Protection Level 3
4.B.4    Protection Level 4
4.B.5    Protection Level 5

5.A    Overview

5.B    Integrity Requirements

5.B.1    Integrity - Basic
5.B.2    Integrity - Medium
5.B.3    Integrity - High

6.A    Overview

6.B    Availability Requirements

6.B.1   Availability - Basic
6.B.2    Availability - Medium
6.B.3    Availability - High

7.A    Overview

7.B    Controlled Interface

7.C    Web Security

7.D    Securing Servers

7.E    Mobile Code and Executable Content

7.F    Electronic Mail (E-mail)

7.G    Collaborative Computing

7.H    Distributed Processing.

8.A    Overview

8.B    Procedural Security

8.B.1    Security Training, Education, and Awareness
8.B.2    Marking and Labeling
8.B.3    Manual Review of Human-Readable Output.
8.B.4    Media Accountability.
8.B.5    Media Clearing and Sanitization.
8.B.6    Co-Location
8.B.7    Incident Reporting and Response
8.B.8    Maintenance
8.B.9    Records Management.

8.C    Environmental Security

8.C.1    Communications Security
8.C.2    Protected Hardware, Software, and Firmware
8.C.3    EMSEC/TEMPEST
8.C.4    Technical Surveillance Countermeasures (TSCM)

8.D    Physical Security

8.E    Personnel Security

8.F    Access by Foreign Nationals to Systems Processing Intelligence Information

8.G    Handling Caveats and Handling Restrictions

9.A    Overview

9.B    Risk Management

9.C    Certification

9.D    Accreditation

9.D.1    Overview
9.D.2    Accreditation Authority
9.D.3    Accreditation Process.
9.D.4    Accreditation Decision.:
9.D.5    Invalidation of an Accreditation.
9.D.6    Withdrawal of Accreditation
9.D.7    Re-evaluation of an Accreditation

9.E    The Certification and Accreditation (C&A) Process

9.F    C&A Process: Exceptions

9.G    Special Categories of ISs

9.G.1    General
9.G.2    Dedicated Servers
9.G.3    Embedded and Special-Purpose ISs.
9.G.4    Tactical or Deployable Systems.
9.G.5    ISs With Group Authenticators
9.G.6    Information Systems Using Periods Processing
9.G.7    Single-User, Standalone ISs.

1. INTRODUCTION
1. Purpose and Content
1. This manual provides uniform policy guidance and requirements for ensuring adequate protection of certain categories of intelligence information (hereinafter intelligence information) that is stored or processed on an information system (IS). For purposes of this manual, intelligence information refers to Sensitive Compartmented Information and special access programs for intelligence under the purview of the DCI. An information system is defined as any telecommunications and/or computer related equipment or interconnected system or subsystems of equipment that is used in the acquisition, storage, manipulation, management, movement, control, display, switching, interchange, transmission, or reception of voice and/or data (digital or analog); it includes software, firmware, and hardware. The Director of Central Intelligence requires all United States Government departments and agencies, their contractors, and Allied governments processing intelligence information to establish, implement, maintain, and abide by the protection measures identified in this manual.
2. This manual includes:
1. Requirements for an Information System Security Program;
2. Guidance on an approach to risk management for systems;
3. Technical and administrative security requirements for a system in a given environment; and
4. Examples of appropriate documentation.
3. This manual provides guidance to assist a Designated Accrediting Authority (DAA) or DAA Representative (described in Chapter 2) in determining the appropriate set of technical and non-technical safeguards for protecting the information in a given system.
4. This manual provides guidance to assist an Information System Security Manager (ISSM) or Information System Security Officer/Network Security Officer (ISSO/NSO) in structuring and implementing the security protections for a system.
2. Applicability
1. This manual applies to all entities that process, store, or communicate intelligence information, including United States government organizations, their commercial contractors, and Allied governments.
2. The term "information system," as defined in this manual, makes the distinction between traditional systems (e.g., computers, hosts) and networks irrelevant to the selection of protection requirements. Unless noted otherwise, the terms "system" and "information system" and "IS" are used interchangeably throughout this manual.
3. Traditionally, providing security for a system has meant protecting the confidentiality of the information on it, although for some systems protecting data integrity and system and data availability has always been a concern. While the traditional operational concern over confidentiality of classified information has not diminished, integrity and availability have become critical parts of security for all systems. The requirements in this manual reflect that understanding.
4. The operational elements of a government organization have, in the past, been concerned with and fiscally responsible for ensuring the integrity and availability of the information on the system. While this manual describes requirements for ensuring the integrity and availability of the system and of the information on it, nothing in this manual shall be construed to state or imply that there has been a transfer of fiscal responsibility to the security element(s) from the operational element(s).
5. This manual establishes the security requirements for all applicable systems. Accrediting authorities may establish additional security measures, if deemed appropriate. Any such measures shall comply with the relevant references listed in this manual.
3. Administration
1. The DDCI/CM has designated the Community Management Staff (CMS) to act in matters pertaining to the administration of this manual for intelligence related issues.
2. The DDCI/CM shall review any unresolved conflicts relating to this manual or its associated policy and will either attain agreed-to resolution of them by all affected parties or forward them with recommendations for resolution to the DCI.
3. CMS shall maintain a current directory of DAAs and a current directory of Data Owners.
4. This manual supersedes Director of Central Intelligence Directive (DCID) 1/16 Supplement dated July 1988.
4. Background
1. United States intelligence information has three attributes that require protection: confidentiality, integrity, and availability. The degree of emphasis on each varies with the type of information processed and the mission of the organization responsible for the data.
2. This manual recognizes the contributions to security made by operating environments, and allows the technical safeguards of systems to be modified accordingly. For example, while encryption can be an effective way to protect the confidentiality of information during transmission, if the information passes only through areas that are approved for open storage of the information or across a protected distribution system within an inspectable space, then encryption of the information for that purpose may be unnecessary.
3. The requirements specified in this manual are based on the assumption that the system is otherwise protected at an appropriate level for the information processed on it. These other protections include appropriate levels of physical, personnel, communications, emanations, and technical surveillance countermeasures (TSCM) security, as required in other directives.
5. System Information Collection. The following information must be collected to determine the requirements for operating a system:
1. The category, classification, and all applicable security markings for all of the information on, or to be put on, the system;
2. The need-to-know status of the users on the system, including their formal access approval(s), clearance(s), and nationality(ies);
3. The perimeter and boundary of the system;
4. The operating environment of the system and connecting systems, including the service provided (e.g., electronic mail, Internet access), and foreign access to the system, connecting systems, and the facilities housing these systems; and
5. The technical and administrative security requirements of the system.
6. How To Use This Manual. Eleven steps are required to accredit an IS. The following summarizes those steps and in each case refers to the relevant chapter or chapters of this manual:
1. Determine Levels-of-Concern (Ch. 3). The DAA, using formal specifications from the Data Owner, examines the information* characteristics in light of the material in Table 3.1 and determines the appropriate Level-of-Concern ratings, one each for confidentiality, integrity, and availability. The Level-of-Concern ratings for integrity and availability are each Basic, Medium, or High. Because all of the ISs covered by this manual process intelligence information, the Level-of-Concern rating for confidentiality is always High.
   

[*In this context, information is expressed as human-recognizable data and machine-recognizable data, in hardware, software, firmware, and, especially, data that is used to control security functions, such as router table entries.]

2. Determine Protection Level (Ch. 3). Based on the guidance provided in Chapter 3, the DAA determines a Protection Level for confidentiality for the system and also determines any threats unique to the system or the information.
3. Determine Interconnected System Requirements (Ch. 7) and Administrative Requirements (Ch. 8). The DAA determines the appropriate security requirements for interconnected systems and for the use of advanced technology specified in Chapter 7 and the administrative requirements specified in Chapter 8.
4. Identify Technical Security and Assurance Requirements (Ch. 4, 5, and 6). The applicable technical security requirements and assurances are identified. Chapter 4 presents the technical security requirements and assurances for confidentiality organized by Protection Levels. Chapters 5 and 6 present the technical security requirements and assurances for integrity and availability, respectively, organized by Levels-of-Concern.
5. Determine Required Documentation and Testing Activities (Ch. 4, 5, and 6). The assurance requirements in Chapters 4, 5, and 6 are examined to determine the appropriate documentation and testing activities required for the system.
6. Write the System Security Plan (Ch. 9 and Appendix C). The System Security Plan (SSP), described in Appendix C, is written to describe the planned operating conditions of the system and the expected residual risk of operating the system (Chapter 9). The DAA and/or ISSM approves the SSP, and the system is then implemented with the security requirements that have been determined for it (paragraphs 1.F.1 through 1.F.5). In the case of operational systems (with their security requirements already implemented), the SSP is written to describe the operating conditions of the system and the residual risk of operating the system.
7. Validate Security in Place. The ISSO ensures that the security requirements and procedures are in place for the system.
8. Testing against Security Requirements (Ch. 4, 5, and 6) The system is tested based on the security testing requirements in Chapters 4, 5, and 6 .
9. Prepare Certification Package (Ch. 4, 5, 6, 9). The ISSO and ISSM prepare the certification package, based on the documentation requirements in Chapters 4, 5, and 6, and the certification package requirements specified in Chapter 9.
10. Forward Certification Package. The certification package is presented to the DAA for accreditation.
11. Accreditation Decision by the DAA. The DAA* determines whether the level of residual risk is acceptable and consistent with that indicated in the SSP, and if it is, accredits the system. Testing shall be performed to validate the extent of residual risk.
    

[*When this manual refers to the DAA, the DAA Representative is assumed to be included, at the discretion of the DAA.]

1. If the DAA accredits the system, the system goes into operation (or continues to operate) according to the accreditation.
2. If the DAA grants an interim approval to operate, the system may be operated for up to 180 days, and the interim approval to operate can be renewed once for an additional 180 days. The DAA must indicate, in the agreement granting interim approval to operate, the actions necessary to meet accreditation. By the end of the second 180-day period, the system shall either be accredited or cease operation.
3. If the DAA neither accredits the system, nor grants an interim approval to operate, then the requester must modify the system or its safeguards, and the process repeats from paragraph 1.F.6, above, until the DAA accredits the system, grants an interim approval to operate, or decides to disallow system operation.
7. Use of Cryptography
1. Cryptography is a critical tool used to protect confidentiality of data, to assure the authenticity of information, and to detect the alteration of information. National policy requires the National Security Agency (NSA) to review and approve all cryptography used to protect classified information from access by unauthorized persons (i.e., not cleared for the information).
2. Cryptography may also be used to separate compartments or protect "need-to-know" among cleared users on classified systems. For such uses the DAA may select the cryptographic mechanisms (including commercially available products) to be used after consulting with the Data Owner on requirements. DAAs should also consult with NSA for assistance and advice regarding the security of the proposed implementation. They should pay particular attention to key management, since appropriate secure key management is an important factor in overall system security.
8. General Notes
1. In the following pages, the term "good engineering practice" refers to the state of the engineering art for commercial systems that have equivalent problems and solutions; a good engineering practice by definition meets commercial requirements. These practices are usually part of the normal installation and operating procedures for systems. When placing security reliance on items that implement good engineering practice (such as commercial off-the shelf [COTS] software), the DAAs or their designees shall verify that the item(s) are set up properly and are operating as expected.
2. In this manual, the word "or" is used in its common English meaning that includes all three cases of a single element in a list, any combination of elements in a list, and all elements in the list.
3. Conventionally, information protection has been expressed as a combination of the following characteristics: confidentiality, integrity, and availability. Other expressions include other characteristics (such as utility, user accountability, authenticity, possession, currency, and non-repudiation), but most of these other characteristics are not independent of confidentiality, integrity, and availability. In other words, these additional characteristics can be expressed as some function of confidentiality, integrity, and availability. Thus, this manual will use the conventional characteristics (confidentiality, integrity, and availability) as the appropriate descriptive elements, while recognizing that some systems have additional operational requirements for services.
4. The Security Support Structure consists of those components (hardware, firmware, and software) that are essential to maintaining the security policies of the system. To prevent access by general users, the Security Support Structure is normally protected at a greater level than the rest of the system.
5. While this manual primarily discusses protection mechanisms for the information on systems, it explicitly assumes that the hardware, software, and firmware related to the system are given appropriate levels of protection.
6. The terms "department" and "agency" refer to the organization that is responsible for information systems security in a given situation. When stating requirements, the terms "department" or "agency" are not limiting, but rather are intended to include all subordinate organizations involved in a given information systems security situation.
2. ROLES AND RESPONSIBILITIES
1. Overview. This chapter describes eight roles pertaining to IS security and assigns responsibilities to each.
1. Separation of Roles
1. Some systems are extensive enough to require a different individual to fill each of the eight roles.
2. More typically, however, the eight roles can be collapsed into four or five, depending on whether the Principal Accrediting Authority (PAA) is also the Data Owner. There is only one restriction on collapsing roles: at the operational level, implementers and examiners shall not be the same person. For example, this structure prohibits the Designated Accrediting Authority from also being the Information System Security Officer. In some agencies, the same individual (e.g., a PAA) may fill management roles at a high level, as both chief examiner and chief implementer, but no single individual can fill both operational roles.
3. The SSP shall specify which roles may be collapsed and which must remain separate.
2. Applicability. In the following subsections, the "system" referred to is the system or systems under the purview of the individual whose roles are being defined.
2. Roles and Responsibilities
1. Special Provision for Waivers of Citizenship Requirements. All concerned PAAs and Data Owners shall approve any exception to the citizenship requirements set forth below, including for systems jointly operated by the US and a foreign allied government.
2. Principal Accrediting Authority
1. Definition: For intelligence data, the designated PAAs, with responsibility for all intelligence systems within their respective purviews, are the DCI, EXDIR/CIA, AS/DOS (Intelligence & Research), DIRNSA, DIRDIA, ADIC/FBI (National Security Div), D/Office of Intelligence/DOE, SAS/Treasury (National Security), D/NIMA, and the D/NRO.
2. Responsibilities of the PAA include:
1. Establishing and maintaining the PAA’s department or agency’s Information System Security Program, including the certification and accreditation programs.
2. Requiring the establishment and operation of similar certification and accreditation programs in those components to which the PAAs have delegated accreditation authority.
3. Ensuring the formal written appointment of DAAs and approval or disapproval of the further delegation of the DAA's authority.
4. Exercising top-level management oversight of the development, implementation, and evaluation of the information system security program in the PAA’s organization. In general, much of the PAA’s operational authority is delegated to DAAs.
5. Implementing the security policy requirements set forth in this manual.
6. Ensuring the establishment of an information security incident response and reporting capability.
7. Ensuring accountability for the protection of the information under the PAA’s purview, including maintenance of required documents concerning the accreditation status of systems.
8. Establishing IS security education, training, and awareness programs to ensure consistency and reciprocity.
9. Establishing a compliance validation and oversight mechanism to ensure consistent implementation of the security policy requirements set forth in this manual.
10. When justified, approving the operation of a system that does not meet the requirements specified in this manual. However, such approval shall be in writing, and the PAA granting such approval shall also accept, in writing, the responsibility for the resulting residual risks and shall inform the other PAAs responsible for systems interconnected to this system. The PAA may choose to delegate this authority to the DAA.
11. Ensuring that security is incorporated as an element of the life-cycle process.
3. Data Owner
1. Definition: The head of the organization that has final statutory and operational authority for specified information. (In the Intelligence Community, the Data Owner is usually the agency head who establishes the controls used for the collection, processing, and dissemination of specified information.)
2. Responsibilities of the Data Owner include:
1. Providing instruction to the PAA/DAA concerning the sensitivity of information under the Data Owner's purview to assist in the PAA/DAA's decision regarding the Levels-of-Concern for confidentiality, integrity, and availability.
2. Determining whether foreign nationals may access information systems accredited under this manual. Access must be consistent with DCID 1/7 and DCID 5/6.
3. The Data Owner may revoke permission to process the information on any system if unsatisfied with the protections it provides, and will notify the PAA/DAA of any decision to revoke.
4. Designated Accrediting Authority
1. Definition: The official with the authority to assume formal responsibility for operating a system at an acceptable level of risk based on the implementation of an approved set of technical, managerial, and procedural safeguards.
2. The DAA shall:
1. Be a United States citizen;
2. Be an employee of United States government;
3. Have a level of authority commensurate with accepting, in writing, the risk of operating all ISs under the DAA’s jurisdiction. Though the DAA need not be technically trained to evaluate an IS, the appointing authority shall ensure that the DAA is supported by individuals knowledgeable in all areas of security such that a technically correct assessment of the security characteristics of the IS can be made.
4. Understand the operational need for the system(s) in question and the operational consequences of not operating the system(s).
3. The DAA grants formal accreditation to operate a system processing intelligence information. The DAA has the authority to withdraw accreditation, suspend operations, grant interim approval to operate, or grant variances when circumstances warrant. The approval shall be a written, dated statement of accreditation that clearly sets forth any conditions or restrictions to system operation. DAAs are responsible and accountable for the security of the information and systems that they accredit.
4. The DAA has the authority to specify, notwithstanding the requirements of this manual, a greater Level-of-Concern or amount of protection for any given system in any given environment.
5. Responsibilities of the DAA include:
1. Ensuring that each system is properly accredited based on (a) its environment and sensitivity levels, and (b) the review and approval of security safeguards and the issuing of written accreditation statements.
2. Providing written notification to the cognizant PAA and Data Owner prior to granting any foreign national access to the system.
3. Ensuring documentation is maintained for all IS accreditations under the DAA’s purview.
4. Ensuring all of the appropriate roles and responsibilities outlined in this directive are accomplished for each IS.
5. Ensuring that operational IS security policies are promulgated for each system, project, program, and site for which the DAA has approval authority.
6. Ensuring an IS’s security education, training, and awareness program is developed and implemented.
7. Overseeing and periodically reviewing system security to accommodate possible changes that may have taken place.
8. Ensuring that organizations plan, budget, allocate, and spend adequate resources in support of IS security.
9. Determining the Levels-of-Concern for confidentiality, integrity, and availability for the data on a system, and informing the ISSM/ISSO of the determination.
10. Ensuring that security is incorporated as an element of the life-cycle process.
11. Ensuring that the responsibilities of the DAA Representative (see paragraph 2.B.5, below) are performed.
12. Approving incident reporting procedures developed by the ISSM.
13. Reporting security-related events to affected parties (i.e., interconnected systems), Data Owners, and all involved PAAs.
14. Ensuring consideration and acknowledgment of Counter Intelligence activities during the C&A process.
6. Should the DAA choose to accredit a system even though the system implementers are unable (within fiscal and operational constraints) to implement all the requirements as specified in this manual, the DAA shall, prior to accreditation:
1. Identify in writing to the Data Owner(s) of all data on the system any requirements that are not being implemented and which mitigating safeguards are being applied to the system.
2. Identify in writing to the DAAs of directly connected systems any requirements that are not being implemented and which mitigating safeguards are being employed on the system.
3. State in writing that the DAA accepts responsibility for the risk of operating the system with lessened protection.
5. Designated Accrediting Authority Representative (DAA Rep)
1. Definition: The technical expert responsible to the DAA for ensuring that security is integrated into and implemented throughout the life cycle of a system. The DAA assigns responsibilities to the DAA Rep. The responsibilities listed below are those normally performed by a DAA Rep. In any given organization, there need not be a DAA Rep (i.e., the DAA or ISSM could perform these functions).
2. The DAA Rep shall:
1. Be a United States citizen.
2. Have a working knowledge of system function, security policies, technical security safeguards, and operational security measures.
3. Responsibilities of the DAA Rep (under the direction of the DAA) include:
1. Developing and overseeing the implementation of the security policy and providing guidance for securing ISs.
2. Ensuring that security testing and evaluation are completed and documented.
3. Advising the DAA on the selection and effective use of specific security mechanisms.
4. Maintaining appropriate system accreditation documentation.
5. Evaluating threats and vulnerabilities to ascertain whether additional safeguards are needed.
6. Ensuring that a record of all security-related vulnerabilities and incidents is maintained, and reporting serious or unresolved violations to the DAA.
7. Ensuring that certification is accomplished for each IS.
8. Evaluating certification documentation and providing written recommendations for accreditation to the DAA.
9. Ensuring that all ISSMs and ISSOs receive technical and security education and training to carry out their duties.
10. Assessing changes in the system, its environment, and operational needs that could affect the accreditation.
6. Information System Security Manager (ISSM)
1. Definition: The manager responsible for an organization's IS security program.
2. The ISSM shall:
1. Be a United States citizen.
2. Have a working knowledge of system functions, security policies, technical security safeguards, and operational security measures.
3. Hold US Government security clearances/access approvals commensurate with the level of information processed by the system.
4. Access only that data, control information, software, hardware, and firmware for which they are authorized access and have a need-to-know, and assume only those roles and privileges for which they are authorized.
3. Responsibilities of the ISSM include:
1. Developing and maintaining a formal Information Systems Security Program.
2. Implementing and enforcing IS security policies.
3. Reviewing all SSPs (described in Appendix C) and endorsing those found to be acceptable.
4. Overseeing all ISSOs to ensure that they are following established information security policies and procedures.
5. Ensuring that all ISSOs receive the necessary technical and security training to carry out their duties.
6. Ensuring the development of system certification documentation by reviewing and endorsing such documentation and recommending action by the DAA.
7. Ensuring approved procedures are in place for clearing, purging, declassifying, and releasing system memory, media, and output.
8. Maintaining, as required by the DAA, a repository for all system certification documentation and modifications.
9. Coordinating IS security inspections, tests, and reviews.
10. Developing procedures for responding to security incidents, and for investigating and reporting (to the DAA Representative and to local management) security violations and incidents, as appropriate.
11. Ensuring proper protection or corrective measures have been taken when an incident or vulnerability has been discovered within a system.
12. Ensuring that data ownership and responsibilities are established for each IS, to include accountability, access rights, and special handling requirements.
13. Ensuring development and implementation of an information security education, training, and awareness program.
14. Ensuring development and implementation of procedures for authorizing the use of software, hardware, and firmware on the system.
15. If a configuration management board exists, serving as a member of the board. (However, the ISSM may elect to delegate this responsibility to the ISSO).
7. Information System Security Officer (ISSO)
1. Definition: The person responsible to the ISSM for ensuring that operational security is maintained for a specific IS; sometimes referred to as a Network Security Officer.
2. The ISSO shall:
1. Be a United States citizen.
2. Have a working knowledge of system functions, security policies, technical security safeguards, and operational security measures.
3. Hold US Government security clearances/access approvals commensurate with the level of information processed by the system.
4. Access only that data, control information, software, hardware, and firmware for which they are authorized access and have a need-to-know, and assume only those roles and privileges for which they are authorized.
3. Responsibilities of the ISSO include:
1. Ensuring systems are operated, maintained, and disposed of in accordance with internal security policies and practices outlined in the security plan.
2. Ensuring that all users have the requisite security clearances, authorization, and need-to-know, and are aware of their security responsibilities before granting access to the IS.
3. Reporting all security-related incidents to the ISSM.
4. Initiating, with the approval of the ISSM, protective or corrective measures when a security incident or vulnerability is discovered.
5. Developing and maintaining an SSP as described in Appendix C.
6. Conducting periodic reviews to ensure compliance with the SSP.
7. Ensuring configuration management (CM) for security-relevant IS software, hardware, and firmware is maintained and documented. If a CM board exists, the ISSO may be a member of the CM board if so designated by the ISSM.
8. Ensuring that system recovery processes are monitored to ensure that security features and procedures are properly restored.
9. Ensuring all IS security-related documentation is current and accessible to properly authorized individuals.
10. Formally notifying the ISSM and the DAA when a system no longer processes intelligence or SAP information.
11. Formally notifying the ISSM and the DAA when changes occur that might affect accreditation.
12. Ensuring that system security requirements are addressed during all phases of the system life cycle.
13. Following procedures developed by the ISSM, authorizing software, hardware, and firmware use before implementation on the system.
8. Privileged Users
1. Definition: A user who has access to system control, monitoring, or administration functions. Example of privileged users include:
1. Users having "superuser," "root," or equivalent access to a system (e.g., system administrators, computer operators, perhaps ISSOs); users with near or complete control of an IS or who set up and administer user accounts, authenticators, and the like.
2. Users having access to change control parameters (routing tables, path priorities, addresses, etc.) on routers, multiplexers, and other key IS equipment.
3. Users who have been given the authority to control and change other users’ access to data or program files (e.g., applications software administrators, administrators of specialty file systems, database managers).
4. Users who have been given special access for troubleshooting or monitoring an IS’s security functions (e.g., those using IS analyzers, management tools).
2. Privileged users shall:
1. Be United States citizens.
2. Have a working knowledge of system functions, security policies, technical security safeguards, and operational security measures.
3. Be limited to the absolute minimum number of privileged users needed to manage the system.
4. Where technically feasible, be limited to the minimum number of privileges needed to perform their assigned duties.
5. Possess a clearance equal to or higher than the highest classification of data processed on or maintained by the IS.
6. Access only that data, control information, software, hardware, and firmware for which they are authorized access and have a need-to-know, and assume only those roles and privileges for which they are authorized.
3. Responsibilities of privileged users include:
1. Protecting the root or superuser authenticator at the highest level of data it secures and not sharing the authenticator and/or account.
2. Reporting all suspected security-related IS problems to the ISSO or ISSM.
3. Using special access or privileges granted only to perform authorized tasks and functions.
4. Enrolling authorized users in an IS.
5. Notifying the ISSO of any system configuration changes that might adversely impact system security.
9. General Users
1. Definition: An individual who can receive information from, input information to, or modify information on, a system without a reliable human review.
2. General users shall:
1. Access only that data, control information, software, hardware, and firmware for which they are authorized access and have a need-to-know, and assume only those roles and privileges for which they are authorized.
2. Immediately report all security incidents and potential threats and vulnerabilities involving an IS to the appropriate ISSO.
3. Protect their authenticators and report any compromise or suspected compromise of an authenticator to the appropriate ISSO.
4. Ensure that system media and system output are properly classified, marked, controlled, stored, transported, and destroyed.
5. Protect terminals/workstations from unauthorized access.
6. Inform the ISSO when access to a particular IS is no longer required (e.g., completion of project, transfer, retirement, resignation).
7. Observe rules and regulations governing the secure operation and authorized use of an IS.
8. Use the IS only for authorized purposes.
9. Not introduce malicious code into any IS or physically damage the system.
10. Not bypass, strain, or test security mechanisms. If security mechanisms must be bypassed for any reason, users shall coordinate the procedure with the ISSO and receive written permission from the ISSM for the procedure.
11. Not introduce or use unauthorized software, firmware, or hardware on an IS.
12. Not relocate or change IS equipment or the network connectivity of IS equipment without proper security authorization.
3. LEVELS-OF-CONCERN AND PROTECTION LEVELS
   
1. Overview. This chapter introduces and defines the concepts of Levels-of-Concern and Protection Levels, and explains how to use them to ascertain the appropriate technical security requirements for confidentiality, integrity, and availability that each IS must meet.
   
1. Conformance with Technical Security Requirements. In order to be certified and accredited, each IS must conform to a set of technical security requirements for confidentiality, integrity, and availability. The specific technical security requirements and associated assurances with which an IS must comply are provided in Chapters 4 (confidentiality), 5 (integrity), and 6 (availability) of this manual. To determine which of these requirements are appropriate for a given IS, the DAA must first ascertain the appropriate Levels-of-Concern and Protection Level for the IS.
2. Non-Multi-User Systems. The technical requirements provided in Chapters 4, 5, and 6 are intended for multi-user systems. Applying them by rote to non-multi-user systems is likely to result in unnecessary costs and detrimental operational impact. Chapter 9, paragraph 9.G, provides supplemental guidance for dealing with "special" systems that may be secured without applying all of the technical requirements of Chapters 4, 5, and 6.
2. Description of Levels-of-Concern
1. Overview
1. The DAA, using guidance from the Data Owner, and after examining the information characteristics of the IS in question, must determine the appropriate Levels-of-Concern ratings for confidentiality, integrity, and availability. The Level-of-Concern rating for each of these areas can be either Basic, Medium, or High. The Level-of-Concern rating is independent for each of these three areas. Thus, for example, a system’s Level-of-Concern for confidentiality could be High, for integrity could be Basic, and for availability could be Medium. When a system has more than one kind of information on it, the Level-of-Concern assigned is the highest Level-of-Concern for any information on the system.
2. The DAA shall determine and assign a Level-of-Concern rating for confidentiality, integrity, and availability for each IS that is to be accredited.
3. The decision regarding the Levels-of-Concern shall be explicit for all (including interconnected) systems. The record of this decision shall be written, and the DAA shall ensure that these records are retained for the operational life of the system(s) involved. At the DAA's discretion, the decision can be made for groups of systems, but it shall be explicit.
2. Determining the Level-of-Concern
1. Confidentiality. Here the Level-of-Concern rating is based on the sensitivity of the information that the IS maintains, processes, and transmits. The more sensitive the information, the higher the IS’s Level-of-Concern. Systems that process intelligence information require a High Level-of-Concern. Since all systems accredited under the authority of this manual by definition process intelligence information, all systems accredited under this manual must be assigned a High Confidentiality Level-of-Concern.
2. Integrity. Here the Level-of-Concern rating is based on the degree of resistance to unauthorized modification of the information maintained, processed, and transmitted by the IS that is necessary for accomplishing the mission of its users. The greater the needed degree of resistance to unauthorized modification, the higher is the Level-of-Concern.
3. Availability. Here the Level-of-Concern rating is based on the degree of ready availability required for the information maintained, processed, and transmitted by the IS in order to accomplish the mission of its users. The greater the need for rapid information availability the higher the Level-of-Concern.
4. Table 3.1 is designed to assist those involved in system development, implementation, certification, and accreditation in determining the appropriate Levels-of-Concern for confidentiality, integrity and availability for a given system processing a given set of information.
3. Protection Levels
1. Protection Level Overview
1. The concept of Protection Levels applies only to confidentiality. Having verified that an IS will maintain, process, or transmit intelligence information and therefore that its Level of Concern for confidentiality must be High, the DAA must next ascertain the appropriate Protection Level for the IS based on the required clearance(s), formal access approval(s), and need-to-know of all direct and indirect users who receive information from the IS without manual intervention and reliable human review. It indicates an implicit level of trust that is placed in the system’s technical capabilities.
2. The DAA must assign a Protection Level to each IS that is to be accredited. The decision regarding the Protection Levels shall be explicit for all (including interconnected) systems. The record of this decision shall be in writing, and the DAA shall ensure that these records are retained for the operational life of the system(s) involved. At the DAA’s discretion, the decision can be made for groups of systems, but it shall be explicit.
2. Determining Protection Levels
1. Table 4.1 presents the criteria for determining which of the five Protection Levels is appropriate for the IS being accredited.
1. An IS operates at Protection Level 1 when all users have all required approvals for access to all information on the IS. This means that all users have all required clearances, formal access approvals, and the need to know for all information on the IS.
2. An IS operates at Protection Level 2 when all users have all required formal approvals for access to all information on the IS, but at least one user lacks administrative approval for some of the information on the IS. This means that all users have all required clearances and all required formal access approvals, but at least one user lacks the need to know for some of the information on the IS.
3. An IS operates at Protection Level 3 when at least one user lacks at least one required formal approval for access to all information on the IS. This means that all users have all required clearances, but at least one user lacks formal access approval for some of the information on the IS.
4. An IS operates at Protection Level 4 when at least one user lacks sufficient clearance for access to some of the information on the IS, but all users have at least a Secret clearance.
5. An IS operates at Protection Level 5 when at least one user lacks any clearance for access to some of the information on the IS.
2. An IS operating at Protection Level 3 presents a potential risk of loss of compartmented information to users lacking the necessary formal access approvals. An IS operating at Protection Levels 4 or 5 presents a potential risk of the loss of classified information to users lacking the necessary clearance. DAAs must recognize the technical risk of operating such ISs, and shall require all reasonably available assurances of the effectiveness of the protection mechanisms for such ISs.
4. Determining Security Features and Assurances
1. Having determined the appropriate Levels-of-Concern and Protection Level for an IS, the DAA next needs to ascertain the specific technical security requirements and assurances for confidentiality, integrity, and availability provided in Chapters 4, 5, and 6, respectively. For example, assume that a system has a Protection Level of 2, a Medium Integrity Level-of-Concern, and a High Availability Level-of-Concern. That system would have to conform to the security features and assurance requirements of Protection Level 2 in Chapter 4, the security features and assurance requirements for a Medium Integrity Level-of-Concern provided in Chapter 5, and the security features and assurance requirements for a High Availability Level-of-Concern provided in Chapter 6.
2. The security features and assurances for confidentiality, integrity, and availability are independent of each other. The DAA is responsible for ascertaining the appropriate security features and assurances for confidentiality, integrity, and availability.

TABLE 3.1 Consolidated Levels-of-Concern

Level of Concern	Confidentiality Indicators (Chapter 4)	Integrity Indicators (Chapter 5)	Availability Indicators (Chapter 6)
Basic	Not applicable to this manual.	Reasonable degree of resis-tance required against unau-thorized modification, or loss of integrity will have an adverse effect.	Information must be available with flexible tolerance for delay,1 or loss of availability will have an adverse effect.
Medium	Not applicable to this manual.	High degree of resistance required against unauthorized modification, or bodily injury might result from loss of integrity, or loss of integrity will have an adverse effect on organizational-level interests.	Information must be readily available with minimum tolerance for delay,2 or bodily injury might result from loss of availability, or loss of availability will have an ad-verse effect on organiza-tional-level interests.
High3	All Information Protect-ing Intelligence Sources, Methods and Analytical Procedures. All Sensitive Compart-mented Information.	Very high degree of resis-tance required against unau-thorized modification, or loss of life might result from loss of integrity, or loss of integrity will have an adverse effect on national-level interests, or loss of integrity will have an adverse effect on confiden-tiality.	Information must always be available upon request, with no tolerance for delay, or loss of life might result from loss of availability, or loss of availability will have an adverse effect on national-level interests, or loss of availability will have an adverse effect on confiden-tiality.

Notes

1 In this context, "flexible tolerance for delay" means that routine system outages do not endanger mission accomplishment; however, extended system outages (days to weeks) may endanger the mission.

2 In this context, "minimum tolerance for delay" means that routine system outages do not endanger mission accomplishment; however, extended system outages (seconds to hours) may endanger the mission.

3 See Table 4.1 (Protection Levels) for more information regarding confidentiality requirements for High Level-of-Concern.

4. CONFIDENTIALITY SYSTEM SECURITY FEATURES AND ASSURANCES
1. Overview
1. This chapter provides the detailed confidentiality* technical security features and assurances. As noted in Chapter 3, the DAA must select the appropriate technical security features and assurances for an IS based on the Protection Level of the IS.

[*Integrity and availability security features and assurances are provided in Chapters 5 and 6, respectively. As noted in Chapter 3, the DAA must ascertain the technical security requirements and assurances for confidentiality, integrity, and availability prior to accrediting an IS.]

2. The chapter separately sets forth the confidentiality requirements for systems operating at each of the five Protection Levels.
3. The underscored terms in brackets preceding the sets of requirements (e.g., [Access1]) indicate how those requirements are identified in the tabular presentation in Appendix D.
4. The annotations in the upper outside margin are intended to aid the readers in quickly determining which Protection Level they are examining. The notations PL1, PL2, PL3, PL4, and PL5 refer to Protection Levels 1, 2, 3, 4 and 5, respectively.
5. Requirements listed in boldface type are in addition to (or different from) the requirements for the previous Protection Level. Entries for Protection Level 1 are in boldface type because the lowest level is the first entry for a given requirement.
2. Confidentiality Requirements. Each IS shall incorporate security features that will control the release of information commensurate with the sensitivity of the information being processed, as well as with the clearance, formal access approval, and need-to-know of the users* of the IS, as determined by the Protection Level assigned. For each IS, assurance commensurate with the Protection Level shall be provided. Table 4.1 identifies the factors used to select the appropriate Protection Level, and cites the paragraphs of this chapter where the relevant requirements can be located.

[*As noted in the previous chapter, the Protection Level for confidentiality is based on clearance(s), formal access approval(s), and need-to-know of all users, where users refers to direct and indirect users who receive information from the IS without manual intervention and reliable human review. But, when applying the confidentiality requirements of this chapter the term user refers only to the direct users of the system.]

TABLE 4.1 Protection Levels

Lowest Clearance	Formal Access Approval	Need To Know	Protection Level
At Least Equal to Highest Data	All Users Have ALL	All Users Have ALL	1 (paragraph 4.B.1)
At Least Equal to Highest Data	All Users Have ALL	NOT ALL Users Have ALL	2 (paragraph 4.B.2)
At Least Equal to Highest Data	NOT ALL users have ALL	Not Contributing to Decision	3 (paragraph 4.B.3)
Secret	Not Contributing to Decision	Not Contributing to Decision	4 (paragraph 4.B.4)
Uncleared	Not Contributing to Decision	Not Contributing to Decision	5 (paragraph 4.B.5)

1. Protection Level 1
1. A system operating at Protection Level 1 shall employ the following features:
1. [Access1] Access control, including:
1. Denial of physical access by unauthorized individuals unless under constant supervision of technically qualified, authorized personnel.
2. Procedures for controlling access by users and maintainers to IS resources, including those that are at remote locations.
2. [I&A1] Identification and Authentication (I&A) procedures that include provisions for uniquely identifying and authenticating the users. Procedures can be external to the system (e.g., procedural or physical controls) or internal to the system (i.e., technical). Electronic means shall be employed where technically feasible.
3. [ParamTrans] Parameter Transmission. Security parameters (e.g., labels, markings) shall be reliably associated (either explicitly or implicitly) with information exchanged between systems.
4. [Recovery] Recovery procedures and technical system features to assure that system recovery is done in a trusted and secure manner. If any circumstances can cause an untrusted recovery, such circumstances shall be documented and appropriate mitigating procedures shall be put in place.
5. [ScrnLck] Screen Lock. Unless there is an overriding technical or operational problem, a terminal/desktop/laptop screen-lock functionality shall be associated with each terminal/desktop/laptop computer. When activated, a screen-lock function shall place an unclassified pattern onto the entire screen of the terminal/desktop/laptop, totally hiding what was previously visible on the screen. Such a capability shall:
1. Be enabled either by explicit user action or if the terminal/desktop/laptop is left idle for a specified period of time (e.g., 15 minutes or more).
2. Ensure that once the terminal/desktop/laptop security/screen-lock software is activated, access to the terminal/desktop/laptop requires knowledge of a unique authenticator.
3. Not be considered a substitute for logging out (unless a mechanism actually logs out the user when the user idle time is exceeded).
6. [SessCtrl1] Session Controls, including:
1. Notification to all users prior to gaining access to a system that system usage may be monitored, recorded, and subject to audit. Electronic means shall be employed where technically feasible.
2. Notification to all users that use of the system indicates (1) the consent of the user to such monitoring and recording and (2) that unauthorized use is prohibited and subject to criminal and civil penalties. Electronic means shall be employed where technically feasible.
7. [Storage] Data Storage, implementing at least one of the following:
1. Information stored in an area approved for open storage* of the information.

[*In the context of storage confidentiality, "approved for open storage" must include consideration of the possibility of access by all users who have direct access to the system or network, wherever physically located.]

2. Information stored in an area approved for continuous personnel access control (when continuous personnel access control is in effect), i.e., a 24-hour, 7-day-per-week operational area.
3. Information secured as appropriate for closed storage.
4. Information encrypted using NSA-approved encryption mechanisms appropriate (see paragraph 1.G.1) for the classification of stored data.
8. [Trans1] Data Transmission.
1. Data transmission that implements at least one of the following:
1. Information distributed only within an area approved for open storage of the information.
2. Information distributed via a Protected Distribution System* (PDS).

[*A PDS provides physical protection or intrusion detection for communications lines. A PDS can also provide need-to-know isolation for communications lines.]

3. Information distributed using NSA-approved encryption mechanisms appropriate (see paragraph 1.G.1) for the classification of the information.
4. Information distributed using a trusted courier.
2. Dial-up lines, other than those that are protected with nationally certified cryptographic devices or PDSs, shall not be used for gaining access to system resources that process intelligence information unless the DAA provides specific written authorization for a system to operate in this manner.
2. If the DAA requires technical controls, a system operating at Protection Level 1 shall employ all of the following features in addition to those mandated in paragraph 4.B.1.a:
1. [AcctMan] Account Management procedures that include:
1. Identifying types of accounts (individual and group, conditions for group membership, associated privileges).
2. Establishing an account (i.e., required paperwork and processes).
3. Activating an account.
4. Modifying an account (e.g., disabling an account, changing privilege level, group memberships, authenticators).
5. Terminating an account (i.e., processes and assurances).
2. [Audit1] Auditing procedures, including:
1. Providing the capability to ensure that all audit records include enough information to allow the ISSO to determine the date and time of action (e.g., common network time), the system locale of the action, the system entity that initiated or completed the action, the resources involved, and the action involved.
2. Protecting the contents of audit trails against unauthorized access, modification, or deletion.
3. Maintaining collected audit data at least 5 years and reviewing at least weekly.
4. The system’s creating and maintaining an audit trail that includes selected records of:
1. Successful and unsuccessful logons and logoffs.
2. Accesses to security-relevant objects and directories, including opens, closes, modifications, and deletions.
3. Activities at the system console (either physical or logical consoles), and other system-level accesses by privileged users.
3. [I&A2] An Identification and Authentication (I&A) management mechanism that ensures a unique identifier for each user and that associates that identifier with all auditable actions taken by the user. The following must be specified:*

[*Alternative controls, such as biometrics or smart cards, may be used at the discretion of the DAA. These alternative methods may have similar requirements. For example, the electronically stored version of biometric authentication patterns needs to be protected, as do password authenticators.]

1. Initial authenticator content and administrative procedures for initial authenticator distribution.
2. Individual and Group authenticators. (Group authenticators may only be used in conjunction with an individual/unique authenticator, that is, individuals must be authenticated with an individual authenticator prior to use of a group authenticator).
3. Length, composition, and generation of authenticators.
4. Change Processes (periodic and in case of compromise).
5. Aging of static authenticators (i.e., not one-time passwords or biometric patterns)
6. History of static authenticator changes, with assurance of non-replication of individual authenticators, per direction in approved SSP.
7. Protection of authenticators to preserve confidentiality and integrity.
4. [I&A3] Identification and Authentication (I&A). Access to the IS by privileged users who either reside outside of the IS’s perimeter or whose communications traverse data links (extranets, Internet, phone lines) that are outside of the IS’s perimeter shall require the use of strong authentication (i.e., an I&A technique that is resistant to replay attacks).
3. Requirements for system assurance at Protection Level 1.
1. [Doc1] Documentation shall include:
1. A System Security Plan (see Appendix C).
2. A Security Concept of Operations (CONOPS). (The Security CONOPS may be included in the System Security Plan). The CONOPS shall at a minimum include a description of the purpose of the system, a description of the system architecture, the system’s accreditation schedule, the system’s Protection Level, integrity Level-of-Concern, availability Level-of-Concern, and a description of the factors that determine the system’s Protection Level, integrity Level-of-Concern, and availability Level-of-Concern.
2. [SysAssur1] System Assurance shall include:
1. Features and procedures to validate the integrity and the expected operation of the security-relevant software, hardware, and firmware.
2. Features or procedures for protection of the operating system from improper changes.
3. [Test1] Assurance shall be provided by the ISSM to the DAA that the system operates in accordance with the approved SSP, and that the security features, including access controls and configuration management, are implemented and operational.
2. Protection Level 2
1. A system operating at Protection Level 2 shall employ the following features:
1. [Access1] Access control, including:
1. Denial of physical access by unauthorized individuals unless under constant supervision of technically qualified, authorized personnel.
2. Procedures for controlling access by users and maintainers to IS resources, including those that are at remote locations.
2. [Access2] Access Control, including a Discretionary Access Control (DAC) Policy. A system has implemented DAC when the Security Support Structure defines and controls access between named users and named objects (e.g., files and programs) in the system. The DAC policy includes administrative procedures to support the policy and its mechanisms. The enforcement mechanisms (e.g., self/group/public controls, access control lists, communities of interest [COIs], encryption) shall allow users to specify and control sharing of those objects by named individuals, or by defined groups of individuals, or by both, and shall provide controls to limit propagation of access rights. The DAC mechanism shall, either by explicit user action or by default, provide that objects are protected from unauthorized access. These access controls shall be capable of including or excluding access to the granularity of a single user. Access permission to an object by users not already possessing access permission shall only be assigned by authorized users.
3. [AcctMan] Account Management procedures that include:
1. Identifying types of accounts (individual and group, conditions for group membership, associated privileges).
2. Establishing an account (i.e., required paperwork and processes).
3. Activating an account.
4. Modifying an account (e.g., disabling an account, changing privilege level, group memberships, authenticators).
5. Terminating an account (i.e., processes and assurances).
4. [Audit1] Auditing procedures, including:
1. Providing the capability to ensure that all audit records include enough information to allow the ISSO to determine the date and time of action (e.g., common network time), the system locale of the action, the system entity that initiated or completed the action, the resources involved, and the action involved.
2. Protecting the contents of audit trails against unauthorized access, modification, or deletion.
3. Maintaining collected audit data at least 5 years and reviewing at least weekly.
4. The system’s creating and maintaining an audit trail that includes selected records of:
1. Successful and unsuccessful logons and logoffs.
2. Accesses to security-relevant objects and directories, including opens, closes, modifications, and deletions.
3. Activities at the system console (either physical or logical consoles), and other system-level accesses by privileged users.
5. [Audit2] Auditing procedures, including:
1. Individual accountability (i.e., unique identification of each user and association of that identity with all auditable actions taken by that individual).
2. Periodic testing by the ISSO or ISSM of the security posture of the IS by employing various intrusion/attack detection and monitoring tools. The ISSO/M shall not invoke such attack software without approval from the appropriate authorities and concurrence of legal counsel. The output of such tools shall be protected against unauthorized access, modification, or deletion.
6. [Audit3] At the discretion of the DAA, audit procedures that include the existence and use of audit reduction and analysis tools.
7. [I&A2] An Identification and Authentication (I&A) management mechanism that ensures a unique identifier for each user and that associates that identifier with all auditable actions taken by the user. The following must be specified:*

[*Alternative controls, such as biometrics or smart cards, may be used at the discretion of the DAA. These alternative methods may have similar requirements. For example, the electronically stored version of biometric authentication patterns needs to be protected, as do password authenticators.]

1. Initial authenticator content and administrative procedures for initial authenticator distribution.
2. Individual and Group Authenticators. (Group authenticators may only be used in conjunction with the use of an individual/unique authenticator, that is, individuals must be authenticated with an individual authenticator prior to use of a group authenticator).
3. Length, composition, and generation of authenticators.
4. Change Processes (periodic and in case of compromise).
5. Aging of static authenticators (i.e., not one-time passwords or biometric patterns)
6. History of static authenticator changes, with assurance of non-replication of individual authenticators, per direction in approved SSP.
7. Protection of authenticators to preserve confidentiality and integrity.
8. [I&A3] Identification and Authentication (I&A). Access to the IS by privileged users who either reside outside of the IS’s perimeter or whose communications traverse data links (extranets, Internet, phone lines) that are outside of the IS’s perimeter shall require the use of strong authentication (i.e., an I&A technique that is resistant to replay attacks).
9. [I&A4] Identification and Authentication. In those instances where the means of authentication is user-specified passwords, the ISSO or ISSM may employ (under the auspices of the DAA) automated tools to validate that the passwords are sufficiently strong to resist cracking and other attacks intended to discover a user’s password.
10. [LeastPrv] Least Privilege procedures, including the assurance that each user or process is granted the most restrictive set of privileges or accesses needed for the performance of authorized tasks shall be employed.
11. [ParamTrans] Parameter Transmission. Security parameters (e.g., labels, markings) shall be reliably associated (either explicitly or implicitly) with information exchanged between systems.
12. [Recovery] Recovery procedures and technical system features to assure that system recovery is done in a trusted and secure manner. If any circumstances can cause an untrusted recovery, such circumstances shall be documented and appropriate mitigating procedures shall be put in place.
13. [ResrcCtrl] Resource Control. All authorizations to the information contained within an object shall be revoked prior to initial assignment, allocation, or reallocation to a subject from the Security Support Structure’s pool of unused objects. No information, including encrypted representations of information, produced by a prior subject’s actions is to be available to any subject that obtains access to an object that has been released back to the system. There must be no residual data from the former object.
14. [ScrnLck] Screen Lock. Unless there is an overriding technical or operational problem, a terminal/desktop/laptop screen-lock functionality shall be associated with each terminal/desktop/laptop computer. When activated, a screen-lock function shall place an unclassified pattern onto the entire screen of the terminal/desktop/laptop, totally hiding what was previously visible on the screen. Such a capability shall:
1. Be enabled either by explicit user action or if the terminal/desktop/laptop is left idle for a specified period of time (e.g., 15 minutes or more).
2. Ensure that once the terminal/desktop/laptop security/screen-lock software is activated, access to the terminal/desktop/laptop requires knowledge of a unique authenticator.
3. Not be considered a substitute for logging out (unless a mechanism actually logs out the user when the user idle time is exceeded).
15. [SessCtrl1] Session Controls, including:
1. Notification to all users prior to gaining access to a system that system usage may be monitored, recorded, and subject to audit. Electronic means shall be employed where technically feasible.
2. Notification to all users that use of the system indicates (1) the consent of the user to such monitoring and recording and (2) that unauthorized use is prohibited and subject to criminal and civil penalties. Electronic means shall be employed where technically feasible.
16. [SessCtrl2] Enforcement of Session Controls, including:
1. Procedures for controlling and auditing concurrent logons from different workstations.
2. Station or session time-outs, as applicable.
3. Limited retry on logon as technically feasible.
4. System actions on unsuccessful logons (e.g., blacklisting of the terminal or user identifier).
17. [Storage] Data Storage, implementing at least one of the following:
1. Information stored in an area approved for open storage* of the information.

[*In the context of storage confidentiality, "approved for open storage" must include consideration of the possibility of access by all users who have direct access to the system or network, wherever physically located.]

2. Information stored in an area approved for continuous personnel access control (when continuous personnel access control is in effect), i.e., a 24-hour, 7-day-per week operational area.
3. Information secured as appropriate for closed storage.
4. Information encrypted using NSA-approved encryption mechanisms appropriate (see paragraph 1.G.1) for the classification of stored data.
18. [Trans1] Data Transmission.
1. Data transmission that implements at least one of the following:
1. Information distributed only within an area approved for open storage of the information.
2. Information distributed via a Protected Distribution System* (PDS).

[*A PDS provides physical protection or intrusion detection for communications lines. A PDS can also provide need-to-know isolation for communications lines.]

3. Information distributed using NSA-approved encryption mechanisms appropriate (see paragraph 1.G.1) for the classification of the information.
4. Information distributed using a trusted courier.
2. Dial-up lines, other than those that are protected with nationally certified cryptographic devices or PDSs, shall not be used for gaining access to system resources that process inform intelligence information unless the DAA provides specific written authorization for a system to operate in this manner.
2. Requirements for system assurance at Protection Level 2.
1. [Doc1] Documentation shall include:
1. A System Security Plan (see Appendix C).
2. A Security Concept of Operations (CONOPS) (the Security CONOPS may be included in the System Security Plan). The CONOPS shall at a minimum include a description of the purpose of the system, a description of the system architecture, the system’s accreditation schedule, the system’s Protection Level, integrity Level-of-Concern, availability Level-of-Concern, and a description of the factors that determine the system’s Protection Level, integrity Level-of-Concern, and availability Level-of-Concern.
2. [Doc2] Documentation shall include guide(s) or manual(s) for the system’s privileged users. The manual(s) shall at a minimum provide information on (1) configuring, installing, and operating the system; (2) making optimum use of the system’s security features; and (3) identifying known security vulnerabilities regarding the configuration and use of administrative functions. The documentation shall be updated as new vulnerabilities are identified.
3. [Doc3] The DAA may direct that documentation also shall include:
1. Certification test plans and procedures detailing the implementation of the features and assurances for the required Protection Level.
2. Reports of test results.
3. A general user’s guide that describes the protection mechanisms provided and that supplies guidelines on how the mechanisms are to be used and how they interact.
4. [SysAssur1] System Assurance shall include:
1. Features and procedures to validate the integrity and the expected operation of the security-relevant software, hardware, and firmware.
2. Features or procedures for protection of the operating system from improper changes.
5. [SysAssur2] System Assurance shall include:
1. Control of access to the Security Support Structure (i.e., the hardware, software, and firmware that perform operating system or security functions).
2. Assurance of the integrity of the Security Support Structure.
6. [Test2] The ISSM shall provide written verification to the DAA that the system operates in accordance with the approved SSP, and that the security features, including access controls, configuration management, and discretionary access controls, are implemented and operational.
7. [Test3] Additional testing, at the discretion of the DAA.
1. Certification testing shall be conducted including verification that the features and assurances required for the Protection Level are functional.
2. A test plan and procedures shall be developed and include:
1. A detailed description of the manner in which the system’s Security Support Structure meets the technical requirements for the Protection Levels and Levels-of-Concern for integrity and availability.
2. A detailed description of the assurances that have been implemented, and how this implementation will be verified.
3. An outline of the inspection and test procedures used to verify this compliance.
3. Protection Level 3
1. A system operating at Protection Level 3 shall employ the following features:
1. [Access1] Access control, including:
1. Denial of physical access by unauthorized individuals unless under constant supervision of technically qualified, authorized personnel.
2. Procedures for controlling access by users and maintainers to IS resources, including those that are at remote locations.
2. [Access2] Access Control, including a Discretionary Access Control (DAC) Policy. A system has implemented DAC when the Security Support Structure defines and controls access between named users and named objects (e.g., files and programs) in the system. The DAC policy includes administrative procedures to support the policy and its mechanisms. The enforcement mechanisms (e.g., self/group/public controls, access control lists, communities of interest [COIs], encryption) shall allow users to specify and control sharing of those objects by named individuals, or by defined groups of individuals, or by both, and shall provide controls to limit propagation of access rights. The DAC mechanism shall, either by explicit user action or by default, provide that objects are protected from unauthorized access. These access controls shall be capable of including or excluding access to the granularity of a single user. Access permission to an object by users not already possessing access permission shall only be assigned by authorized users.
3. [Access3] Access Control, including:
1. Some process or mechanism(s) that allows users (or processes acting on their behalf) to determine the formal access approvals (e.g., compartments into which users are briefed) granted to another user. This process or mechanism is intended to aid the user in determining the appropriateness of information exchange.
2. Some process or mechanism(s) that allow users (or processes acting on their behalf) to determine the sensitivity level (i.e., classification level, classification category, and handling caveats) of data. This process or mechanism is intended to aid the user in determining the appropriateness of information exchange.
4. [AcctMan] Account Management procedures that include:
1. Identifying types of accounts (individual and group, conditions for group membership, associated privileges).
2. Establishing an account (i.e., required paperwork and processes).
3. Activating an account.
4. Modifying an account (e.g., disabling an account, changing privilege level, group memberships, authenticators).
5. Terminating an account (i.e., processes and assurances).
5. [Audit1] Auditing procedures, including:
1. Providing the capability to ensure that all audit records include enough information to allow the ISSO to determine the date and time of action (e.g., common network time), the system locale of the action, the system entity that initiated or completed the action, the resources involved, and the action involved.
2. Protecting the contents of audit trails against unauthorized access, modification, or deletion.
3. Maintaining collected audit data at least 5 years and reviewing at least weekly.
4. The system’s creating and maintaining an audit trail that includes selected records of:
1. Successful and unsuccessful logons and logoffs.
2. Accesses to security-relevant objects and directories, including opens, closes, modifications, and deletions.
3. Activities at the system console (either physical or logical consoles), and other system-level accesses by privileged users.
6. [Audit3] Audit procedures that include the existence and use of audit reduction and analysis tools.
7. [Audit4] An audit trail, created and maintained by the IS, that is capable of recording changes to the mechanism’s list of user formal access permissions. (Note: Applicable only if the [Access3] access control mechanism is automated.)
8. [Audit5] Auditing procedures, including:
1. Individual accountability (i.e., unique identification of each user and association of that identity with all auditable actions taken by that individual).
2. Periodic testing by the ISSO or ISSM of the security posture of the IS by employing various intrusion/attack detection and monitoring tools. The ISSO/M shall not invoke such attack software without approval from the appropriate authorities and concurrence of legal counsel. The output of such tools shall be protected against unauthorized access, modification, or deletion. These tools shall build upon audit reduction and analysis tools to aid the ISSO or ISSM in the monitoring and detection of suspicious, intrusive, or attack-like behavior patterns.
9. [I&A2] An Identification and Authentication (I&A) management mechanism that ensures a unique identifier for each user and that associates that identifier with all auditable actions taken by the user. The following must be specified:*

[*Alternative controls, such as biometrics or smart cards, may be used at the discretion of the DAA. These alternative methods may have similar requirements. For example, the electronically stored version of biometric authentication patterns needs to be protected, as do password authenticators.]

1. Initial authenticator content and administrative procedures for initial authenticator distribution.
2. Individual and Group authenticators. (Group authenticators may only be used in conjunction with the use of an individual/unique authenticator, that is, individuals must be authenticated with an individual authenticator prior to use of a group authenticator).
3. Length, composition, and generation of authenticators.
4. Change Processes (periodic and in case of compromise).
5. Aging of static authenticators (i.e., not one-time passwords or biometric patterns)
6. History of static authenticator changes, with assurance of non-replication of individual authenticators, per direction in approved SSP.
7. Protection of authenticators to preserve confidentiality and integrity.
10. [I&A4] Identification and Authentication. In those instances where the means of authentication is user-specified passwords, the ISSO or ISSM may employ (under the auspices of the DAA) automated tools to validate that the passwords are sufficiently strong to resist cracking and other attacks intended to discover a user’s password.
11. [I&A5] Identification and Authentication. In those instances where the users are remotely accessing the system, the users shall employ a strong authentication mechanism (i.e., an I&A technique that is resistant to replay attacks).
12. [LeastPrv] Least Privilege procedures, including the assurance that each user or process is granted the most restrictive set of privileges or accesses needed for the performance of authorized tasks shall be employed.
13. [Marking] Marking procedures and mechanisms to ensure that either the user or the system itself marks all data transmitted or stored by the system to reflect the sensitivity of the data (i.e., classification level, classification category, and handling caveats). Markings shall be retained with the data.
14. [ParamTrans] Parameter Transmission. Security parameters (e.g., labels, markings) shall be reliably associated (either explicitly or implicitly) with information exchanged between systems.
15. [Recovery] Recovery procedures and technical system features to assure that system recovery is done in a trusted and secure manner. If any circumstances can cause an untrusted recovery, such circumstances shall be documented and appropriate mitigating procedures shall be put in place.
16. [ResrcCtrl] Resource Control. All authorizations to the information contained within an object shall be revoked prior to initial assignment, allocation, or reallocation to a subject from the Security Support Structure’s pool of unused objects. No information, including encrypted representations of information, produced by a prior subject’s actions is to be available to any subject that obtains access to an object that has been released back to the system. There must be no residual data from the former object.
17. [ScrnLck] Screen Lock. Unless there is an overriding technical or operational problem, a terminal/desktop/laptop screen-lock functionality shall be associated with each terminal/desktop/laptop computer. When activated, a screen-lock function shall place an unclassified pattern onto the entire screen of the terminal/desktop/laptop, totally hiding what was previously visible on the screen. Such a capability shall:
1. Be enabled either by explicit user action or if the terminal/desktop/laptop is left idle for a specified period of time (e.g., 15 minutes or more).
2. Ensure that once the terminal/desktop/laptop security/screen-lock software is activated, access to the terminal/desktop/laptop requires knowledge of a unique authenticator.
3. Not be considered a substitute for logging out (unless a mechanism actually logs out the user when the user idle time is exceeded).
18. [Separation] Separation of Roles. The functions of the ISSO and the system manager/system administrator shall not be performed by the same person.
19. [SessCtrl1] Session Controls, including:
1. User notification such that all IS users shall be notified prior to gaining access to a system that system usage may be monitored, recorded, and subject to audit. Electronic means shall be employed where technically feasible.
2. The user shall also be advised that use of the system indicates (1) the consent of the user to such monitoring and recording and (2) that unauthorized use is prohibited and subject to criminal and civil penalties. Electronic means shall be employed where technically feasible.
20. [SessCtrl2] Enforcement of Session Controls, including:
1. Procedures for controlling and auditing concurrent logons from different workstations.
2. Station or session time-outs, as applicable.
3. Limited retry on logon as technically feasible.
4. System actions on unsuccessful logons (e.g., blacklisting of the terminal or user identifier).
21. [Storage] Data Storage, implementing at least one of the following:
1. Information stored in an area approved for open storage* of the information.

[*In the context of storage confidentiality, "approved for open storage" must include consideration of the possibility of access by all users who have direct access to the system or network, wherever physically located.]

2. Information stored in an area approved for continuous personnel access control (when continuous personnel access control is in effect), i.e., a 24-hour, 7-day-per week operational area.
3. Information secured as appropriate for closed storage.
4. Information encrypted using NSA-approved encryption mechanisms appropriate (see paragraph 1.G.1) for the classification of stored data.
22. [Trans1] Data Transmission.
1. Data transmission that implements at least one of the following:
1. Information distributed only within an area approved for open storage of the information.
2. Information distributed via a Protected Distribution System* (PDS).

[*A PDS provides physical protection or intrusion detection for communications lines. A PDS can also provide need-to-know isolation for communications lines.]

3. Information distributed using NSA-approved encryption mechanisms appropriate (see paragraph 1.G.1) for the classification of the information.
4. Information distributed using a trusted courier.
2. Dial-up lines, other than those that are protected with nationally certified cryptographic devices or PDSs, shall not be used for gaining access to system resources that process intelligence information unless the DAA provides specific written authorization for a system to operate in this manner.
2. Requirements for system assurance at Protection Level 3.
1. [Doc1] Documentation shall include:
1. A System Security Plan (see Appendix C).
2. A Security Concept of Operations (CONOPS) (the Security CONOPS may be included in the System Security Plan). The CONOPS shall at a minimum include a description of the purpose of the system, a description of the system architecture, the system’s accreditation schedule, the system’s Protection Level, integrity Level-of-Concern, availability Level-of-Concern, and a description of the factors that determine the system’s Protection Level, integrity Level-of-Concern, and availability Level-of-Concern.
2. [Doc2] Documentation shall include guide(s) or manual(s) for the system’s privileged users. The manual(s) shall at a minimum provide information on (1) configuring, installing, and operating the system; (2) making optimum use of the system’s security features; and (3) identifying known security vulnerabilities regarding the configuration and use of administrative functions. The documentation shall be updated as new vulnerabilities are identified.
3. [Doc3] Documentation shall include:
1. Certification test plans and procedures detailing the implementation of the features and assurances for the required Protection Level.
2. Reports of test results.
3. A general user’s guide that describes the protection mechanisms provided, and that supplies guidelines on how the mechanisms are to be used, and how they interact.
4. [SysAssur1] System Assurance shall include:
1. Features and procedures to validate the integrity and the expected operation of the security-relevant software, hardware, and firmware.
2. Features or procedures for protection of the operating system from improper changes.
5. [SysAssur2] System Assurance shall include:
1. Control of access to the Security Support Structure (i.e., the hardware, software, and firmware that perform operating system or security functions).
2. Assurance of the integrity of the Security Support Structure.
6. [SysAssur3] System Assurance shall include:
1. Isolating the Security Support Structure, by means of partitions, domains, etc., including control of access to, and integrity of, hardware, software, and firmware that perform security functions.
2. Using up-to-date vulnerability assessment tools to validate the continued integrity of the Security Support Structure by ensuring that the system configuration does not contain any well-known security vulnerabilities.
7. [Test2] The ISSM shall provide written verification to the DAA that the system operates in accordance with the approved SSP, and that the security features, including access controls, configuration management, and discretionary access controls, are implemented and operational.
8. [Test3] Additional testing.
1. Certification testing shall be conducted including verification that the features and assurances required for the Protection Level are functional.
2. A test plan and procedures shall be developed and include:
1. A detailed description of the manner in which the system’s Security Support Structure meets the technical requirements for the Protection Levels and Levels-of-Concern for integrity and availability.
2. A detailed description of the assurances that have been implemented, and how this implementation will be verified.
3. An outline of the inspection and test procedures used to verify this compliance.
9. [Test4] Testing, as required by the DAA:
1. Security Penetration Testing shall be conducted to determine the level of difficulty in penetrating the security countermeasures of the system.
2. An Independent Validation and Verification team shall be formed to assist in the security testing and to perform validation and verification testing of the system.
4. Protection Level 4
1. A system operating at Protection Level 4 shall employ the following features:
1. [Access1] Access control, including:
1. Denial of physical access by unauthorized individuals unless under constant supervision of technically qualified, authorized personnel.
2. Procedures for controlling access by users and maintainers to IS resources, including those that are at remote locations.
2. [Access2] Access Control, including a Discretionary Access Control (DAC) Policy. A system has implemented DAC when the Security Support Structure defines and controls access between named users and named objects (e.g., files and programs) in the system. The DAC policy includes administrative procedures to support the policy and its mechanisms. The enforcement mechanisms (e.g., self/group/public controls, access control lists, communities of interest [COIs], encryption) shall allow users to specify and control sharing of those objects by named individuals, or by defined groups of individuals, or by both, and shall provide controls to limit propagation of access rights. The DAC mechanism shall, either by explicit user action or by default, provide that objects are protected from unauthorized access. These access controls shall be capable of including or excluding access to the granularity of a single user. Access permission to an object by users not already possessing access permission shall only be assigned by authorized users.
3. [Access4] Access Control, including assurance that each user shall receive from the system only that information to which the user is authorized access.
4. [Access5] Access Control, including a Mandatory Access Control (MAC) Policy that shall require:
1. The Security Support Structure to enforce a mandatory access control policy over all subjects and storage objects under its control (e.g., processes, files, segments, devices).
2. These subjects and objects to be assigned sensitivity labels that combine hierarchical classification levels and non-hierarchical categories; the labels shall be used as the basis for mandatory access control decisions.
3. The Security Support Structure to be able to support two or more such security levels.
4. Identification and authentication data to be used by the Security Support Structure to authenticate the user's identity and to assure that the security level and authorization of subjects external to the Security Support Structure that may be created to act on behalf of the individual user are dominated by the clearance and authorization of that user.
5. Application of the following restrictions to all accesses between subjects and objects controlled by the Security Support Structure:
1. A subject can read an object only if the security level of the subject dominates^* the security level of the object (i.e., a subject can "read down").

[*Security level S1 is said to dominate security level S2 if the hierarchical classification of S1 is greater than or equal to that of S2 and the non-hierarchical categories of S1 include all those of S2].

2. A subject can write to an object only if two conditions are met: the security level of the object must dominate the security level of the subject, and the security level of the user’s clearance* must dominate the security level of the object (i.e., a subject can "write up," but no higher than the user’s clearance).

[*In those instances where a subject is an electronic entity (e.g., a process), then the subject is generally acting on the behalf of a user.]

5. [AcctMan] Account Management procedures that include:
1. Identifying types of accounts (individual and group, conditions for group membership, associated privileges).
2. Establishing an account (i.e., required paperwork and processes).
3. Activating an account.
4. Modifying an account (e.g., disabling an account, changing privilege level, group memberships, authenticators).
5. Terminating an account (i.e., processes and assurances).
6. [Audit1] Auditing procedures, including:
1. Providing the capability to ensure that all audit records include enough information to allow the ISSO to determine the date and time of action (e.g., common network time), the system locale of the action, the system entity that initiated or completed the action, the resources involved, and the action involved.
2. Protecting the contents of audit trails against unauthorized access, modification, or deletion.
3. Maintaining collected audit data at least 5 years and reviewing at least weekly.
4. The system’s creating and maintaining an audit trail that includes selected records of:
1. Successful and unsuccessful logons and logoffs.
2. Accesses to security-relevant objects and directories, including opens, closes, modifications, and deletions.
3. Activities at the system console (either physical or logical consoles), and other system-level accesses by privileged users.
7. [Audit3] Audit procedures that include the existence and use of audit reduction and analysis tools.
8. [Audit5] Auditing procedures, including:
1. Individual accountability (i.e., unique identification of each user and association of that identity with all auditable actions taken by that individual).
2. Periodic testing by the ISSO or ISSM of the security posture of the IS by employing various intrusion/attack detection and monitoring tools. The ISSO/M shall not invoke such attack software without approval from the appropriate authorities and concurrence of legal counsel. The output of such tools shall be protected against unauthorized access, modification, or deletion. These tools shall build upon audit reduction and analysis tools to aid the ISSO or ISSM in the monitoring and detection of suspicious, intrusive, or attack-like behavior patterns.
9. [Audit6] Auditing procedures, including :
1. Enforcement of the capability to audit changes in security labels.
2. Enforcement of the capability to audit accesses or attempted accesses to objects or data whose labels are inconsistent with user privileges.
3. Enforcement of the capability to audit all program initiations, information downgrades and overrides, and all other security-relevant events (specifically including identified events that may be used in the exploitation of covert channels).
4. In the event of an audit failure, system shutdown unless an alternative audit capability exists.
10. [Audit7] Auditing procedures, including:
1. The capability of the system to monitor occurrences of, or accumulation of, auditable events that may indicate an imminent violation of security policies.
2. The capability of the system to notify the ISSO of suspicious events and taking the least-disruptive action to terminate the suspicious events.
11. [I&A2] An Identification and Authentication (I&A) management mechanism that ensures a unique identifier for each user and that associates that identifier with all auditable actions taken by the user. The following must be specified:*

[*Alternative controls, such as biometrics or smart cards, may be used at the discretion of the DAA. These alternative methods may have similar requirements. For example, the electronically stored version of biometric authentication patterns needs to be protected, as do password authenticators.]

1. Initial authenticator content and administrative procedures for initial authenticator distribution.
2. Individual and Group authenticators. (Group authenticators may only be used in conjunction with the use of an individual/unique authenticator, that is, individuals must be authenticated with an individual authenticator prior to use of a group authenticator).
3. Length, composition, and generation of authenticators.
4. Change Processes (periodic and in case of compromise).
5. Aging of static authenticators (i.e., not one-time passwords or biometric patterns)
6. History of static authenticator changes, with assurance of non-replication of individual authenticators, per direction in approved SSP.
7. Protection of authenticators to preserve confidentiality and integrity.
12. [I&A4] Identification and Authentication. In those instances where the means of authentication is user-specified passwords, the ISSO or ISSM may employ (under the auspices of the DAA) automated tools to validate that the passwords are sufficiently strong to resist cracking and other attacks intended to discover a user’s password.
13. [I&A5] Identification and Authentication. In those instances where the users are remotely accessing the system, the users shall employ a strong authentication mechanism (i.e., an I&A technique that is resistant to replay attacks).
14. [I&A6] Identification and Authentication (I&A) management mechanisms that include:
1. Implementation and support of a trusted communications path between the user and the Security Support Structure of the desktop for login and authentication. Communication via this path shall be initiated exclusively by the user and shall be unmistakably distinguishable from other paths.
2. In the case of communication between two or more systems (e.g. client server architecture), bi-directional authentication between the two systems.
15. [Label1] Labeling procedures, including:
1. Internal security labels that are an integral part of the electronic data or media.
2. Procedures for managing content, generation, attachment, and persistence of internal labels that are documented in the SSP.
3. Security labels that reflect the sensitivity (i.e., classification level, classification category, and handling caveats) of the information.
4. Maintenance by the Security Support Structure of a record of the kind(s) of data allowed on each communications channel.
5. A means for the system to ensure that labels a user associates with information provided to the system are consistent with the sensitivity levels that the user is allowed to access.
16. [Label2] Labeling procedures, including internal and external labeling such as label integrity, exportation, subject-sensitivity labels, and device labels, as applicable.
17. [LeastPrv] Least Privilege procedures, including the assurance that each user or process is granted the most restrictive set of privileges or accesses needed for the performance of authorized tasks.
18. [ParamTrans] Parameter Transmission. Security parameters (e.g., labels, markings) that are reliably associated (either explicitly or implicitly) with information exchanged between systems.
19. [Recovery] Recovery procedures and technical system features to assure that system recovery is done in a trusted and secure manner. If any circumstances can cause an untrusted recovery, such circumstances shall be documented and appropriate mitigating procedures shall be put in place.
20. [ResrcCtrl] Resource Control. All authorizations to the information contained within an object shall be revoked prior to initial assignment, allocation, or reallocation to a subject from the Security Support Structure’s pool of unused objects. No information, including encrypted representations of information, produced by a prior subject’s actions is to be available to any subject that obtains access to an object that has been released back to the system. There must be no residual data from the former object.
21. [ScrnLck] Screen Lock. Unless there is an overriding technical or operational problem, a terminal/desktop/laptop screen-lock functionality shall be associated with each terminal/desktop/laptop computer. When activated, a screen-lock function shall place an unclassified pattern onto the entire screen of the terminal/desktop/laptop, totally hiding what was previously visible on the screen. Such a capability shall:
1. Be enabled either by explicit user action or if the terminal/desktop/laptop is left idle for a specified period of time (e.g., 15 minutes or more).
2. Ensure that once the terminal/desktop/laptop security/screen-lock software is activated, access to the terminal/desktop/laptop requires knowledge of a unique authenticator.
3. Not be considered a substitute for logging out (unless a mechanism actually logs out the user when the user idle time is exceeded).
22. [Separation] Separation of Roles. The functions of the ISSO and the system manager/system administrator shall not be performed by the same person.
23. [SessCtrl1] Session Controls, including:
1. User notification such that all IS users shall be notified prior to gaining access to a system that system usage may be monitored, recorded, and subject to audit. Electronic means shall be employed where technically feasible.
2. The user shall also be advised that use of the system indicates (1) the consent of the user to such monitoring and recording and (2) that unauthorized use is prohibited and subject to criminal and civil penalties. Electronic means shall be employed where technically feasible.
24. [SessCtrl2] Enforcement of Session Controls, including:
1. Procedures for controlling and auditing concurrent logons from different workstations.
2. Station or session time-outs, as applicable.
3. Limited retry on logon as technically feasible.
4. System actions on unsuccessful logons (e.g., blacklisting of the terminal or user identifier).
25. [Storage] Data Storage, implementing at least one of the following:
1. Information stored in an area approved for open storage* of the information.

[*In the context of storage confidentiality, "approved for open storage" must include consideration of the possibility of access by all users who have direct access to the system or network, wherever physically located.]

2. Information stored in an area approved for continuous personnel access control (when continuous personnel access control is in effect), i.e., a 24-hour 7-day-per-week operational area.
3. Information secured as appropriate for closed storage.
4. Information encrypted using NSA-approved encryption mechanisms appropriate (see paragraph 1.G.1) for the classification of stored data.
26. [Trans1] Data Transmission.
1. Data transmission that implements at least one of the following:
1. Information distributed only within an area approved for open storage of the information.
2. Information distributed via a Protected Distribution System* (PDS).

[*A PDS provides physical protection or intrusion detection for communications lines. A PDS can also provide need-to-know isolation for communications lines.]

3. Information distributed using NSA-approved encryption mechanisms appropriate (see paragraph 1.G.1) for the classification of the information.
4. Information distributed using a trusted courier.
2. Dial-up lines, other than those that are protected with nationally certified cryptographic devices or PDSs, shall not be used for gaining access to system resources that process intelligence information unless the DAA provides specific written authorization for a system to operate in this manner.
27. [TranSep] Separation of Data. Information transmissions of different security levels shall be segregated from each other (e.g., encryption, physical separation).
2. Requirements for system assurance at Protection Level 4.
1. [CCA] At the discretion of the DAA, a thorough search for covert channels shall be conducted, and a determination shall be made of the maximum bandwidth of each identified channel.
2. [Doc1] Documentation shall include:
1. A System Security Plan (see Appendix C).
2. A Security Concept of Operations (CONOPS) (the Security CONOPS may be included in the System Security Plan). The CONOPS shall at a minimum include a description of the purpose of the system, a description of the system architecture, the system’s accreditation schedule, the system’s Protection Level, integrity Level-of-Concern, availability Level-of-Concern, and a description of the factors that determine the system’s Protection Level, integrity Level-of-Concern, and availability Level-of-Concern.
3. [Doc2] Documentation shall include guide(s) or manual(s) for the system’s privileged users. The manual(s) shall at a minimum provide information on (1) configuring, installing, and operating the system; (2) making optimum use of the system’s security features; and (3) identifying known security vulnerabilities regarding the configuration and use of administrative functions. The documentation shall be updated as new vulnerabilities are identified.
4. [Doc4] Documentation shall include:
1. Certification test plans and procedures detailing the implementation of the features and assurances for the required Protection Level.
2. Reports of test results.
3. A general user’s guide that describes the protection mechanisms provided, and that supplies guidelines on how the mechanisms are to be used, and how they interact.
4. Documentation, including System Design Documentation, if applicable.
5. [SysAssur1] System Assurance shall include:
1. Features and procedures to validate the integrity and the expected operation of the security-relevant software, hardware, and firmware.
2. Features or procedures for protection of the operating system from improper changes.
6. [SysAssur2] System Assurance shall include:
1. Control of access to the Security Support Structure (i.e., the hardware, software, and firmware that perform operating system or security functions).
2. Assurance of the integrity of the Security Support Structure.
7. [SysAssur3] System Assurance shall include:
1. Isolating the Security Support Structure, by means of partitions, domains, etc., including control of access to, and integrity of, hardware, software, and firmware that perform security functions.
2. Using up-to-date vulnerability assessment tools to validate the continued integrity of the Security Support Structure by ensuring that the system configuration does not contain any well-known security vulnerabilities.
8. [SysAssur4] System Assurance. The Security Support Structure shall maintain separate execution domains (e.g., address spaces) for each executing process.
9. [Test2] The ISSM shall provide written verification to the DAA that the system operates in accordance with the approved SSP, and that the security features, including access controls, configuration management, and discretionary access controls, are implemented and operational.
10. [Test3] Additional testing.
1. Certification testing shall be conducted including verification that the features and assurances required for the Protection Level are functional.
2. A test plan and procedures shall be developed and include:
1. A detailed description of the manner in which the system’s Security Support Structure meets the technical requirements for the Protection Levels and Levels-of-Concern for integrity and availability.
2. A detailed description of the assurances that have been implemented, and how this implementation will be verified.
3. An outline of the inspection and test procedures used to verify this compliance.
11. [Test4] Testing shall include:
1. Security Penetration Testing to determine the level of difficulty in penetrating the security countermeasures of the system.
2. Formation of an Independent Verification and Validation team to assist in the security testing and to perform validation and verification testing of the system.
5. Protection Level 5
1. A system operating at Protection Level 5 shall employ the following features:
1. [Access1] Access control, including:
1. Denial of physical access by unauthorized individuals unless under constant supervision of technically qualified, authorized personnel.
2. Procedures for controlling access by users and maintainers to IS resources, including those that are at remote locations.
2. [Access2] Access Control, including a Discretionary Access Control (DAC) Policy. A system has implemented DAC when the Security Support Structure defines and controls access between named users and named objects (e.g., files and programs) in the system. The DAC policy includes administrative procedures to support the policy and its mechanisms. The enforcement mechanisms (e.g., self/group/public controls, access control lists, communities of interest [COIs], encryption) shall allow users to specify and control sharing of those objects by named individuals, or by defined groups of individuals, or by both, and shall provide controls to limit propagation of access rights. The DAC mechanism shall, either by explicit user action or by default, provide that objects are protected from unauthorized access. These access controls shall be capable of including or excluding access to the granularity of a single user. Access permission to an object by users not already possessing access permission shall only be assigned by authorized users.
3. [Access4] Access Control, including assurance that each user shall receive from the system only that information to which the user is authorized access.
4. [Access5] Access Control, including a Mandatory Access Control (MAC) Policy that shall require:
1. The Security Support Structure to enforce a mandatory access control policy over all subjects and storage objects under its control (e.g., processes, files, segments, devices).
2. These subjects and objects to be assigned sensitivity labels that combine hierarchical classification levels and non-hierarchical categories; the labels shall be used as the basis for mandatory access control decisions.
3. The Security Support Structure to be able to support two or more such security levels.
4. Identification and authentication data to be used by the Security Support Structure to authenticate the user's identity and to assure that the security level and authorization of subjects external to the Security Support Structure that may be created to act on behalf of the individual user are dominated by the clearance and authorization of that user.
5. Application of the following restrictions to all accesses between subjects and objects controlled by the Security Support Structure:
1. A subject can read an object only if the security level of the subject dominates* the security level of the object (i.e., a subject can "read down").

[*Security level S1 is said to dominate security level S2 if the hierarchical classification of S1 is greater than or equal to that of S2 and the non-hierarchical categories of S1 include all those of S2.]

2. A subject can write to an object only if two conditions are met: the security level of the object must dominate the security level of the subject, and the security level of the user’s clearance* must dominate the security level of the object (i.e., a subject can "write up," but no higher than the user’s clearance).

[*In those instances where a subject is an electronic entity (e.g., a process), then the subject is generally acting on the behalf of a user.]

5. [AcctMan] Account Management procedures that include:
1. Identifying types of accounts (individual and group, conditions for group membership, associated privileges).
2. Establishing an account (i.e., required paperwork and processes).
3. Activating an account.
4. Modifying an account (e.g., disabling an account, changing privilege level, group memberships, authenticators).
5. Terminating an account (i.e., processes and assurances).
6. [Audit1] Auditing procedures, including:
1. Providing the capability to ensure that all audit records include enough information to allow the ISSO to determine the date and time of action (e.g., common network time), the system locale of the action, the system entity that initiated or completed the action, the resources involved, and the action involved.
2. Protecting the contents of audit trails against unauthorized access, modification, or deletion.
3. Maintaining collected audit data at least 5 years and reviewing at least weekly.
4. The system’s creating and maintaining an audit trail that includes selected records of:
1. Successful and unsuccessful logons and logoffs.
2. Accesses to security-relevant objects and directories, including opens, closes, modifications, and deletions.
3. Activities at the system console (either physical or logical consoles), and other system-level accesses by privileged users.
7. [Audit3] Audit procedures that include the existence and use of audit reduction and analysis tools.
8. [Audit6] Auditing procedures, including:
1. Enforcement of the capability to audit changes in security labels.
2. Enforcement of the capability to audit accesses or attempted accesses to objects or data whose labels are inconsistent with user privileges.
3. Enforcement of the capability to audit all program initiations, information downgrades and overrides, and all other security-relevant events (specifically including identified events that may be used in the exploitation of covert channels).
4. In the event of an audit failure, system shutdown unless an alternate audit capability exists.
9. [Audit8] Auditing procedures, including:
1. Individual accountability (i.e., unique identification of each user and association of that identity with all auditable actions taken by that individual).
2. At least monthly testing by the ISSO or ISSM of the security posture of the IS by employing various intrusion/attack detection and monitoring tools. The ISSO/M shall not invoke such attack software without approval from the appropriate authorities and concurrence of legal counsel. The output of such tools shall be protected against unauthorized access, modification, or deletion. These tools shall build upon audit reduction and analysis tools to aid the ISSO or ISSM in the monitoring and detection of suspicious, intrusive, or attack-like behavior patterns.
10. [Audit9] Auditing procedures, including:
1. The capability of the system to monitor, in real-time, occurrences of, or accumulation of, auditable events that may indicate an imminent violation of security policies.
2. The capability of the system to notify the ISSO of suspicious events and taking the least-disruptive action to terminate the suspicious event.
11. [I&A2] An Identification and Authentication (I&A) management mechanism that ensures a unique identifier for each user and that associates that identifier with all auditable actions taken by the user. The following must be specified:*

[*Alternative controls, such as biometrics or smart cards, may be used at the discretion of the DAA. These alternative methods may have similar requirements. For example, the electronically stored version of biometric authentication patterns needs to be protected, as do password authenticators.]

1. Initial authenticator content and administrative procedures for initial authenticator distribution.
2. Individual and Group authenticators. (Group authenticators may only be used in conjunction with the use of an individual/unique authenticator, that is, individuals must be authenticated with an individual authenticator prior to use of a group authenticator).
3. Length, composition, and generation of authenticators.
4. Change Processes (periodic and in case of compromise).
5. Aging of static authenticators (i.e., not one-time passwords or biometric patterns)
6. History of static authenticator changes, with assurance of non-replication of individual authenticators, per direction in approved SSP.
7. Protection of authenticators to preserve confidentiality and integrity.
12. [I&A4] Identification and Authentication. In those instances where the means of authentication is user-specified passwords, the ISSO or ISSM may employ (under the auspices of the DAA) automated tools to validate that the passwords are sufficiently strong to resist cracking and other attacks intended to discover a user’s password.
13. [I&A5] Identification and Authentication. In those instances where the users are remotely accessing the system, the users shall employ a strong authentication mechanism (i.e., an I&A technique that is resistant to replay attacks).
14. [I&A6] Identification and Authentication (I&A) management mechanisms that include:
1. Implementation and support of a trusted communications path between the user and the Security Support Structure of the desktop for login and authentication. Communication via this path shall be initiated exclusively by the user and shall be unmistakably distinguishable from other paths.
2. In the case of communication between two or more systems (e.g. client server architecture), bi-directional authentication between the two systems.
15. [Label1] Labeling procedures, including:
1. Internal security labels that are an integral part of the electronic data or media.
2. Procedures for managing content, generation, attachment, and persistence of internal labels that are documented in the SSP.
3. Security labels that reflect the sensitivity (i.e., classification level, classification category, and handling caveats) of the information .
4. Maintenance by the Security Support Structure of a record of the kind(s) of data allowed on each communications channel.
5. A means for the system to ensure that labels a user associates with information provided to the system are consistent with the sensitivity levels that the user is allowed to access.
16. [Label2] Labeling procedures, including internal and external labeling such as label integrity, exportation, subject-sensitivity labels, and device labels, as applicable.
17. [LeastPrv] Least Privilege procedures, including the assurance that each user or process is granted the most restrictive set of privileges or accesses needed for the performance of authorized tasks.
18. [ParamTrans] Parameter Transmission. Security parameters (e.g., labels, markings) that are reliably associated (either explicitly or implicitly) with information exchanged between systems.
19. [Recovery] Recovery procedures and technical system features to assure that system recovery is done in a trusted and secure manner. If any circumstances can cause an untrusted recovery, such circumstances shall be documented and appropriate mitigating procedures shall be put in place.
20. [ResrcCtrl] Resource Control. All authorizations to the information contained within an object shall be revoked prior to initial assignment, allocation, or reallocation to a subject from the Security Support Structure’s pool of unused objects. No information, including encrypted representations of information, produced by a prior subject’s actions is to be available to any subject that obtains access to an object that has been released back to the system. There must be no residual data from the former object.
21. [ScrnLck] Screen Lock. Unless there is an overriding technical or operational problem, a terminal/desktop/laptop screen-lock functionality shall be associated with each terminal/desktop/laptop computer. When activated, a screen-lock function shall place an unclassified pattern onto the entire screen of the terminal/desktop/laptop, totally hiding what was previously visible on the screen. Such a capability shall:
1. Be enabled either by explicit user action or if the terminal/desktop/laptop is left idle for a specified period of time (e.g., 15 minutes or more).
2. Ensure that once the terminal/desktop/laptop security/screen-lock software is activated, access to the terminal/desktop/laptop requires knowledge of a unique authenticator.
3. Not be considered a substitute for logging out (unless a mechanism actually logs out the user when the user idle time is exceeded).
22. [Separate] Separation of Roles. The functions of the ISSO and the system manager/system administrator shall not be performed by the same person.
23. [SessCtrl1] Session Controls, including:
1. User notification such that all IS users shall be notified prior to gaining access to a system that system usage may be monitored, recorded, and subject to audit. Electronic means shall be employed where technically feasible.
2. The user shall also be advised that use of the system indicates (1) the consent of the user to such monitoring and recording and (2) that unauthorized use is prohibited and subject to criminal and civil penalties. Electronic means shall be employed where technically feasible.
24. [SessCtrl2] Enforcement of Session Controls, including:
1. Procedures for controlling and auditing concurrent logons from different workstations.
2. Station or session time-outs, as applicable.
3. Limited retry on logon as technically feasible.
4. System actions on unsuccessful logons (e.g., blacklisting of the terminal or user identifier).
25. [Storage] Data Storage, implementing at least one of the following:
1. Information stored in an area approved for open storage* of the information.

[*In the context of storage confidentiality, "approved for open storage" must include consideration of the possibility of access by all users who have direct access to the system or network, wherever physically located.]

2. Information stored in an area approved for continuous personnel access control (when continuous personnel access control is in effect), i.e., a 24-hour, 7-day-per week operational area.
3. Information secured as appropriate for closed storage.
4. Information encrypted using NSA-approved encryption mechanisms appropriate (see paragraph 1.G.1) for the classification of stored data.
26. [Trans1] Data Transmission.
1. Data transmission that implements at least one of the following:
1. Information distributed only within an area approved for open storage of the information.
2. Information distributed via a Protected Distribution System* (PDS).

[*A PDS provides physical protection or intrusion detection for communications lines. A PDS can also provide need-to-know isolation for communications lines.]

3. Information distributed using NSA-approved encryption mechanisms appropriate (see paragraph 1.G.1) for the classification of the information.
4. Information distributed using a trusted courier.
2. Dial-up lines, other than those that are protected with nationally certified cryptographic devices or PDSs, shall not be used for gaining access to system resources that process intelligence information unless the DAA provides specific written authorization for a system to operate in this manner.
27. [TranSep] Separation of Data. Information transmissions of different security levels shall be segregated from each other (e.g., encryption, physical separation).
2. Requirements for system assurance at Protection Level 5.
1. [CCA] A thorough search for covert channels shall be conducted, and a determination shall be made of the maximum bandwidth of each identified channel.
2. [Doc1] Documentation shall include:
1. A System Security Plan (see Appendix C).
2. A Security Concept of Operations (CONOPS) (the Security CONOPS may be included in the System Security Plan). The CONOPS shall at a minimum include a description of the purpose of the system, a description of the system architecture, the system’s accreditation schedule, the system’s Protection Level, integrity Level-of-Concern, availability Level-of-Concern, and a description of the factors that determine the system’s Protection Level, integrity Level-of-Concern, and availability Level-of-Concern.
3. [Doc2] Documentation shall include guide(s) or manual(s) for the system’s privileged users. The manual(s) shall at a minimum provide information on (1) configuring, installing, and operating the system; (2) making optimum use of the system’s security features; and (3) identifying known security vulnerabilities regarding the configuration and use of administrative functions. The documentation shall be updated as new vulnerabilities are identified.
4. [Doc4] Documentation shall include:
1. Certification test plans and procedures detailing the implementation of the features and assurances for the required Protection Level.
2. Reports of test results.
3. A general user’s guide that describes the protection mechanisms provided, and that supplies guidelines on how the mechanisms are to be used, and how they interact.
4. Documentation, including System Design Documentation, if applicable.
5. [SysAssur1] System Assurance shall include:
1. Features and procedures to validate the integrity and the expected operation of the security-relevant software, hardware, and firmware.
2. Features or procedures for protection of the operating system from improper changes.
6. [SysAssur2] System Assurance shall include:
1. Control of access to the Security Support Structure (i.e., the hardware, software, and firmware that perform operating system or security functions).
2. Assurance of the integrity of the Security Support Structure.
7. [SysAssur3] System Assurance shall include:
1. Isolating the Security Support Structure, by means of partitions, domains, etc., including control of access to, and integrity of, hardware, software, and firmware that perform security functions.
2. Using up-to-date vulnerability assessment tools to validate the continued integrity of the Security Support Structure by ensuring that the system configuration does not contain any well-known security vulnerabilities.
8. [SysAssur4] System Assurance. The Security Support Structure shall maintain separate execution domains (e.g., address spaces) for each executing process.
9. [Test2] The ISSM shall provide written verification to the DAA that the system operates in accordance with the approved SSP, and that the security features, including access controls, configuration management, and discretionary access controls, are implemented and operational.
10. [Test3] Additional testing.
1. Certification testing shall be conducted including verification that the features and assurances required for the Protection Level are functional.
2. A test plan and procedures shall be developed and include:
1. A detailed description of the manner in which the system’s Security Support Structure meets the technical requirements for the Protection Levels and Levels-of-Concern for integrity and availability.
2. A detailed description of the assurances that have been implemented, and how this implementation will be verified.
3. An outline of the inspection and test procedures used to verify this compliance.
11. [Test5] Testing shall include:
1. Security Penetration Testing to determine the level of difficulty in penetrating the security countermeasures of the system.
2. Formation of an Independent Verification and Validation team that at least annually assists in security testing and performing validation and verification testing of the system.
5. INTEGRITY SYSTEM SECURITY FEATURES AND ASSURANCES
   
1. Overview
1. This chapter provides the detailed integrity* technical security features and assurances. As noted in Chapter 3, the DAA must select the appropriate integrity technical security features and assurances for an IS based on the Integrity Level-of-Concern of the IS.

[*Chapters 4 and 6 provide confidentiality and availability security features and assurances are provided in Chapters 4 and 6, respectively. As noted in Chapter 3, the DAA must ascertain the technical security requirements and assurances for confidentiality, integrity and availability prior to accrediting an IS.]

2. The chapter separately sets forth the integrity requirements for systems at each of the three Integrity Levels-of-Concern (Basic, Medium, and High).
3. The underscored terms in brackets preceding the sets of requirements (e.g., [Backup1]) indicate how they are identified in the tabular presentation in Appendix D.
4. The annotations in the upper outside margin are intended to aid the readers in quickly determining which Integrity Level-of-Concern they are examining. The notations INTEG-B, INTEG-M, and INTEG-H indicate integrity Basic, integrity Medium, and integrity High, respectively.
5. Requirements listed in boldface type are in addition to (or different from) the requirements for the previous Level-of-Concern. Entries for the Basic Level-of-Concern are in boldface type because the lowest level is the first entry for a given requirement.
2. Integrity Requirements. Each IS shall implement security features that will ensure the degree of resistance to unauthorized modification of the information that is commensurate with its determined Integrity Level-of-Concern (see Chapter 3 for more information on Levels-of-Concern). For each IS, assurance commensurate with the Integrity Level-of-Concern shall be provided. Table 5.1 identifies factors used to select the appropriate Integrity Level-of-Concern and cites the paragraphs of this chapter where the relevant requirements can be located.

 

TABLE 5.1 Integrity Level-of-Concern

Level-of-Concern	Integrity Factors	Location In Manual
Basic	Reasonable degree of resistance required against unauthorized modification, or loss of integrity will have an adverse effect.	paragraph 5.B.1
Medium	High degree of resistance required against unauthorized modification, but not absolute, or bodily injury might result from loss of integrity; or loss of integrity will have an adverse effect on organizational-level interests.	paragraph 5.B.2
High	Very high degree of resistance required against unauthorized modification, or loss of life might result from loss of integrity; or loss of integrity will have an adverse effect on national-level interests, or loss of integrity will have an adverse effect on confidentiality.	paragraph 5.B.3

1. Integrity - Basic
1. A system operating at the Basic Level-of-Concern for integrity shall implement the following features:
1. [Backup1] Backup procedures, including good engineering practice with regard to backup policies and procedures.
2. [CM1] Configuration Management (CM) that includes:
1. Policies that assure the effectiveness of storage integrity.
2. Procedures to assure the appropriate physical and technical protection of the backup and restoration hardware, firmware, and software, such as router tables, compilers, and other security-related system software.
3. [Integrty1] Good engineering practice with regard to COTS integrity mechanisms, such as parity checks and Cyclical Redundancy Checks (CRCs).
4. [MalCode] Procedures to prevent the introduction of malicious code into the system, including the timely updating of those mechanisms intended to prevent the introduction of malicious code (e.g., updating anti-viral software).
2. The following assurance shall be provided a system operating at a Basic Level-of-Concern for Integrity:
1. [Verif1] Verification by the ISSM that the necessary security procedures and mechanisms are in place; testing of them by the ISSM to ensure that they work appropriately.
2. Integrity - Medium
1. A system operating at the Medium Level-of-Concern for integrity shall implement the following features:
1. [Backup2] Backup procedures to ensure both the existence of sufficient backup storage capability and effective restoration* of the backup data.

[*In this context, restoration includes both incremental and complete replacement of the system’s contents from the contents of the backup media.]

2. [Backup3] Backup storage that is located to allow the prompt restoration of data. If required by the DAA, there shall additionally be off-site backup storage of data, as per approved SSP; such storage is intended to enable recovery if a single event eliminates both the original data and the on-site backup data. If regular off-site backup is not feasible, such as on a ship at sea, alternative procedures, such as secure transmission of the data to an appropriate off-site location, should be considered.
3. [Change1] Change Control that includes:
1. Mechanisms that notify users of the time and date of the last change in data content.
2. Procedures and technical system features to assure that changes to the data or to security-related items are:
1. Executed only by authorized personnel.
2. Properly implemented.
4. [CM1] Configuration Management (CM) that includes:
1. Policies that assure the effectiveness of storage integrity.
2. Procedures to assure the appropriate physical and technical protection of the backup and restoration hardware, firmware, and software, such as router tables, compilers, and other security-related system software.
5. [CM2] Configuration Management that includes:
1. A CM Plan, including:
1. Policies that assure storage integrity.
2. Procedures for identifying and documenting system connectivity, including any software, hardware, and firmware used for all communications (including, but not limited to wireless, IR, etc.).
3. Procedures for identifying and documenting the type, model, and brand of system or component, security relevant software, hardware, and firmware product names and version or release numbers, and physical locations.
2. A CM process to implement the CM Plan.
6. [Integrty2] Data and software storage integrity protection, including the use of strong integrity mechanisms (e.g., integrity locks, encryption).
7. [Integrty3] Integrity, including the implementation of specific non-repudiation capabilities (e.g., digital signatures), if mission accomplishment requires non-repudiation.
8. [MalCode] Procedures to prevent the introduction of malicious code into the system, including the timely updating of those mechanisms intended to prevent the introduction of malicious code (e.g., updating anti-viral software).
2. The following assurances shall be provided a system operating at a Medium Level-of-Concern for Integrity:
1. [Validate] Security Support Structure Validation, including procedures or features to validate, periodically, the correct operation of the hardware, software, and firmware elements of the Security Support Structure.
2. [Verif1] Verification by the ISSM that the necessary security procedures and mechanisms are in place; testing of them by the ISSM to ensure that they work appropriately.
3. Integrity - High
1. A system operating at the High Level-of-Concern for integrity shall implement the following features:
1. [Backup4] Backup procedures, including:
1. A capability to conduct backup storage and restoration of data and access controls.
2. Frequent backups of data.*

[*In this context, frequent means after any significant system hardware, software, or firmware change, and, in any case, no less often than once per year.]

3. At least annual restoration of backup data.
4. Backup storage that is located to allow the immediate restoration of data. There shall additionally be off-site backup storage of the data, as per approved SSP; such storage is intended to enable recovery if a single event eliminates both the original data and the on-site backup data. If regular off-site backup is not feasible, such as on a ship at sea, alternative procedures, such as secure transmission of the data to an appropriate off-site location, should be considered.
2. [Change1] Change Control that includes:
1. Mechanisms that notify users of the time and date of the last change in data content.
2. Procedures and technical system features to assure that changes to the data or to security-related items are:
1. Executed only by authorized personnel.
2. Properly implemented.
3. [Change2] Change Control that includes:
1. A secure, unchangeable audit trail that will facilitate the correction of improper data changes.
2. Transaction-based systems (e.g., database management systems, transaction processing systems) that implement transaction roll-back and transaction journaling, or technical equivalents.
4. [CM1] Configuration Management (CM) that includes:
1. Policies that assure the effectiveness of storage integrity.
2. Procedures to assure the appropriate physical and technical protection of the backup and restoration hardware, firmware, and software, such as router tables, compilers, and other security-related system software.
5. [CM2] Configuration Management that includes:
1. A CM Plan, including:
1. Policies that assure storage integrity.
2. Procedures for identifying and documenting system connectivity, including any software, hardware, and firmware used for all communications (including, but not limited to wireless, IR, etc.).
3. Procedures for identifying and documenting the type, model, and brand of system or component, security relevant software, hardware, and firmware product names and version or release numbers, and physical locations.
2. A CM process to implement the CM Plan.
6. [CM3] Configuration management that includes:
1. A CM process to test, and verify the CM Plan periodically.
2. A CM control board, which includes the ISSM/ISSO as a member.
3. A verification process that assures it is neither technically nor procedurally feasible to make changes to the Security Support Structure outside of the CM process.
7. [Integrty2] Data and software storage integrity protection, including the use of strong integrity mechanisms (e.g., integrity locks, encryption).
8. [Integrty3] Integrity, including the implementation of specific non-repudiation capabilities (e.g., digital signatures), if mission accomplishment requires non-repudiation.
9. [MalCode] Procedures to prevent the introduction of malicious code into the system, including the timely updating of those mechanisms intended to prevent the introduction of malicious code (e.g., updating anti-viral software).
10. [Recovery] Recovery procedures and technical system features that assure that system recovery is done in a trusted and secure manner. If any circumstances can cause an untrusted recovery, such circumstances shall be documented and appropriate mitigating procedures shall be put in place.
11. [Trans2] Data Transmission, including:
1. Integrity mechanisms adequate to assure the integrity of all transmitted information (including labels and security parameters).
2. Mechanisms to detect or prevent the hijacking of a communication session (e.g., encrypted communication channels).
2. The following assurances shall be provided for a system operating at a High Level-of-Concern for Integrity:
1. [SysIntgr1] System Integrity that includes the isolation of the Security Support Structure, by means of partitions, domains, etc., including control of access to, and integrity of, hardware, software, and firmware that perform security functions.
2. [SysIntgr2] System Integrity, such that the Security Support Structure maintains separate execution domains (e.g., address spaces) for each executing process.
3. [Validate] Security Support Structure Validation that includes procedures or features to validate, periodically, the correct operation of the hardware, software, and firmware elements of the Security Support Structure.
4. [Verif2] Verification by the DAA Rep that the necessary security procedures and mechanisms are in place; testing of them by the DAA Rep to ensure that they work appropriately.
6. AVAILABILITY SYSTEM SECURITY FEATURES AND ASSURANCES
1. Overview
1. This chapter provides the detailed availability* technical security features and assurances. As noted in Chapter 3, the DAA must select the appropriate availability technical security features and assurances for an IS based on the Availability Level-of-Concern of the IS.

[*Chapters 4 and 5 provide confidentiality and integrity security features and assurances, respectively. As noted in Chapter 3, the DAA must ascertain the technical security requirements and assurances for confidentiality, integrity and availability prior to accrediting an IS.]

2. This chapter separately sets forth the availability requirements for systems at each of the three Availability Levels-of-Concern (Basic, Medium, and High).
3. The underscored terms in brackets preceding the sets of requirements (e.g., [Verif1]) indicate how they are identified in the tabular presentation in Appendix D.
4. The annotations in the upper outside margin are intended to aid the readers in quickly determining which Availability Level-of-Concern they are examining. The notations AVAIL-B, AVAIL-M and AVAIL-H indicate availability Basic, availability Medium, and availability High, respectively.
5. Requirements listed in boldface type are in addition to (or different from) the requirements for the previous Level-of-Concern. Entries for the Basic Level-of-Concern are all in boldface type because the lowest level is the first entry for a given requirement.
2. Availability Requirements. Each IS shall implement security features that will ensure information is available for use when, where, and in the form required, commensurate with its determined Availability Level-of-Concern (see Chapter 3 for more information on Levels-of-Concern). For each IS, assurance commensurate with the Level-of-Concern for Availability shall be provided. Table 6.1 identifies factors used to select the appropriate Availability Level-of-Concern and cites the paragraphs of this chapter where the relevant requirements can be located.

Table 6.1 Availability Level-of-Concern

Level-of-Concern	Availability Factors	Location In Manual
Basic	Information must be available with flexible tolerance for delay,1 or loss of availability will have an adverse effect.	paragraph 6.B.1
Medium	Information must be readily available with minimum tolerance for delay,2 or bodily injury might result from loss of availability; or loss of availability will have an adverse effect on organizational-level interests.	paragraph 6.B.2
High	Information must always be available upon request, with no tolerance for delay; or loss of life might result from loss of availability; or loss of availability will have an adverse effect on national-level interests; or loss of availability will have an adverse effect on confidentiality.	paragraph 6.B.3

Notes

1 In this context, "flexible tolerance for delay" means that routine system outages do not endanger mission accomplishment; however, extended system outages (days to weeks) may endanger the mission.

2 In this context, "minimum tolerance for delay" means that mission accomplishment requires retrieval of the information from this system in a short time (seconds to hours).

1. Availability - Basic
1. A system operating at the Basic Level-of-Concern for Availability shall implement the following features:
1. [Avail] Processes and procedures to allow for the restoration* of the system.

[*Restoration of service is a necessary function to guard against both natural disasters and denial-of-service attacks.]

2. [Backup1] Backup procedures, including good engineering practice with regard to backup policies and procedures.
2. The following assurances shall be provided for a system operating at a Basic Level-of-Concern for Availability:
1. [Verif1] Verification by the ISSM that the necessary security procedures and mechanisms are in place; testing of them by the ISSM to ensure that they work appropriately.
2. Availability - Medium
1. A system operating at the Medium Level-of-Concern for Availability shall implement the following features:
1. [Avail] Processes and procedures to allow for the restoration* of the system.

[*Restoration of service is a necessary function to guard against both natural disasters and denial-of-service attacks.]

2. [Backup3] Backup storage that is located to allow the prompt restoration of data. If required by the DAA, there shall additionally be off-site backup storage of the data, as per approved SSP; such storage is intended to enable recovery if a single event eliminates both the original data and the on-site backup data. If regular off-site backup is not feasible, as, for example, on a ship at sea, alternative procedures, such a secure transmission of the data to an appropriate off-site location, should be considered.
3. [Backup5] Backup procedures to allow the restoration of operational capabilities with minimal loss of service or data. These procedures shall require:
1. Frequent backups of data.
2. To the extent deemed necessary by the DAA, assurance that the system state after the restore will reflect the security-relevant changes to the system between the backup and the restore.
3. Assurance that the availability of information in storage is adequate for all operational situations, and that catastrophic damage to any single storage entity will not result in system-wide loss of information. These policies shall include, among others, procedures for ensuring the physical protection of operational and backup media and equipment, and for ensuring the continued functionality of the operational and backup media and equipment.
4. Restoration of any security-relevant segment of the system state (e.g., access control lists, cryptologic keys, deleted system status information) without requiring destruction of other system data.
4. [Commun] Communications capability that provides adequate communications to accomplish the mission when the primary operations communications capabilities are unavailable.
5. [Maint] Maintenance procedures that include preventive maintenance, scheduled to maximize the availability of the system, and thus to minimize interference with the operation of the system. Planning for maintenance shall include at least:
1. On-call maintenance.
2. On-site diagnostics.
3. Control of Remote Diagnostics, where applicable. (See para. 8B.8.d, for a discussion of remote diagnostics.)
6. [Power1] System Availability, including, by default for a multi-user system, conditioned, battery-backed power adequate to allow the system to be fail-soft. If the system is multi-user, the decision not to use an Uninterruptible Power Supply (UPS) for the system shall be explicit.
7. [Power2] System Availability, including, as required by the DAA, procedures for graceful transfer of the system to an alternate power source; these procedures shall ensure that the transfer is completed within the timing requirements of the application(s) on the system.
8. [Recovery] Recovery procedures and technical system features that assure that system recovery is done in a trusted and secure manner. If any circumstances can cause an untrusted recovery, such circumstances shall be documented and appropriate mitigating procedures shall be put in place.
2. The following assurances shall be provided for a system operating at a Medium Level-of-Concern for Availability:
1. [Cont1] Contingency Planning that includes a Contingency/Disaster Recovery Plan.
2. [Verif1] Verification by the ISSM that the necessary security procedures and mechanisms are in place; testing by the ISSM to ensure that they work appropriately.
3. Availability - High
1. A system operating at the High Level-of-Concern for Availability shall implement the following features:
1. [Avail] Processes and procedures to allow for the restoration* of the system.

[*Restoration of service is a necessary function to guard against both natural disasters and denial-of-service attacks.]

2. [Backup4] Backup procedures, including:
1. A capability to conduct backup storage and restoration of data.
2. Frequent backups of data.*

[*In this context, frequent means after any significant system hardware, software, or firmware change, and, in any case, no less often than once per year.]

3. At least annual restoration of backup data.
4. Backup storage that is located to allow the immediate restoration of data. There shall additionally be off-site backup storage of the data, as per approved SSP; such storage is intended to enable recovery if a single event eliminates both the original and the on-site, backup data. If regular off-site backup is not feasible, as, for example, on a ship at sea, alternative procedures such as secure transmission of the data to an appropriate off-site location, should be considered.
3. [Backup5] Backup procedures to allow the restoration of operational capabilities with minimal loss of service or data. These procedures shall require:
1. Frequent backups of data.
2. To the extent deemed necessary by the DAA, assurance that the system state after the restore will reflect security-relevant changes to the system between the backup and the restore.
3. Assurance that the availability of information in storage is adequate for all operational situations, and that catastrophic damage to any single storage entity will not result in system-wide loss of information. These policies shall include, among others, procedures for ensuring the physical protection of operational and backup media and equipment, and for ensuring the continued functionality of the operational and backup media and equipment.
4. Restoration of any security-relevant segment of the system state (e.g., access control lists, cryptologic keys, deleted system status information) without requiring destruction of other system data.
4. [Backup6] Backup procedures, including:
1. Assurance that the system state after the restore will reflect security-relevant changes to the system between the backup and the restore.
2. Consideration to the use of technical features that enhance data integrity and availability including, among others, remote journaling, Redundant Array of Inexpensive Disks (RAID) 1 and above, and similar techniques.
5. [Commun] Communications capability that provides adequate communications to accomplish the mission when the primary operations communications capabilities are unavailable.
6. [DOS] Prevention of Denial of Service Attacks.* Where technically feasible, procedures and mechanisms shall be in place to curtail or prevent well-known, detectable, and preventable denial of service attacks (e.g., SYN attack).

[*Only a limited number of denial-of-service attacks are detectable and preventable. Often, prevention of such attacks is handled by a controlled interface. (See Chapter 7 for a discussion on controlled interfaces.)]

7. [Maint] Maintenance procedures that include preventive maintenance, scheduled to maximize the availability of the system, and so minimize interference with the operation of the system. Planning for maintenance shall include at least:
1. On-call maintenance.
2. On-site diagnostics.
3. Control of Remote Diagnostics, where applicable. (See para. 8B.8.d, for a discussion of remote diagnostics.)
8. [Monit] Periodic testing by the ISSO or ISSM of the security posture of the IS by employing various intrusion/attack detection and monitoring tools. The ISSO/M shall not invoke such attack software without approval from the appropriate authorities and concurrence of legal counsel. The monitoring tools shall be used for the monitoring and detection of suspicious, intrusive, or attack-like behavior patterns.
9. [Power1] System Availability, including, by default for a multi-user system, conditioned, battery-backed power adequate to allow the system to be fail-soft. If the system is multi-user, the decision not to use an Uninterruptible Power Supply (UPS) for the system shall be explicit.
10. [Power2] System Availability, including procedures for graceful transfer of the system to an alternate power source; these procedures shall ensure that the transfer is completed within the timing requirements of the application(s) on the system.
11. [Priority] Priority protection that includes no "Deny Up" (i.e., a lower-priority process shall not be able to interfere with the system's servicing of any higher-priority process).
12. [Recovery] Recovery procedures and technical system features that assure that system recovery is done in a trusted and secure manner. If any circumstances can cause an untrusted recovery, such circumstances shall be documented and appropriate mitigating procedures shall be put in place.
2. The following assurances shall be provided for a system operating at a High Level-of-Concern for Availability:
1. [Cont1] Contingency Planning that includes a Contingency/Disaster Recovery Plan.
2. [Cont2] Contingency Planning, including:
1. Adequate hardware, firmware, software, power, and cooling to accomplish the mission when the operational equipment is unavailable. Consideration shall be given to fault-tolerant or "hot-backup" operations. The decision whether or not to use these techniques shall be explicit.
2. Regular exercising and testing of the contingency plans. The plans for the tests shall be documented in the Contingency/Disaster Recovery Plan.
3. [Verif2] Verification by the DAA Rep that the necessary security procedures and mechanisms are in place; testing by the DAA Rep to ensure that they work appropriately.
7. REQUIREMENTS FOR INTERCONNECTED ISs AND ADVANCED TECHNOLOGY
   
1. Overview. This chapter discusses the security requirements for safeguarding interconnected information systems, and for safeguarding information systems that employ advanced technologies such as such as World Wide Web servers, mobile code, electronic mail, or collaborative computing.
   
1. An interconnected IS is composed of separately accredited ISs. Each self-contained IS maintains its own intra-system services and controls, protects its own resources, and retains its individual accreditation. Each participating IS has its own ISSO.
1. Interconnected ISs shall have a mechanism capable of adjudicating the different security policy implementations of the participating ISs.
2. Interconnected ISs require accreditation that explicitly addresses their interconnectivity (see Chapter 9 for discussion and definition of accreditation).
2. When connecting two or more ISs, the DAA(s) shall review the security attributes of each system to determine whether the combination of data or the combination of users who have access to the interconnected ISs necessitates a higher level of security requirements. DAA(s) shall explicitly make this determination, even if the systems are accredited at the same level of technical requirements.
3. The characteristics and capabilities of interconnected ISs require special security considerations (e.g., controlling the flow of information into or out of an interconnected IS). This chapter introduces additional requirements for interconnected ISs and expands on the security requirements stated in Chapters 4, 5, and 6 as they apply to interconnected ISs.
4. Many environments employ technologies such as World Wide Web servers, mobile code, electronic mail, or collaborative computing to accomplish their mission. Such technologies may be employed across interconnected ISs to enhance inter-system services, or within an IS to enhance intra-system services. These technologies have security ramifications that are not always readily handled by the requirements provided in Chapters 4, 5, and 6. This chapter introduces additional security requirements for such technology and expands upon the security requirements in Chapters 4, 5, and 6 as they apply to such technologies.
2. Controlled Interface
1. Controlled Interface Overview
1. A Controlled Interface is a mechanism that facilitates adjudicating the security policies of different interconnected ISs (e.g., controlling the flow of information into or out of an interconnected IS). Controlling the flow of information into an interconnected IS helps preserve the integrity of the IS, and the integrity and confidentiality of the information maintained and processed by the IS. Controlling the flow of information out of the IS* helps preserve the confidentiality of the information leaving the IS, and may protect the integrity of the receiving ISs. The adjudication of integrity and confidentiality policies may be handled in a variety of ways. For example:

[*Controlled Interfaces that control the flow of information out of an IS are often employed to facilitate push technology, where the goal is to push information to an indirect user residing outside of the IS perimeter, but within the IS boundary.]

1. A single Controlled Interface may perform all of the confidentiality and integrity adjudication; or
2. One Controlled Interface may be employed for adjudicating confidentiality policies while another adjudicates integrity policies; or
3. The adjudication of confidentiality and integrity policies may be distributed across a set of Controlled Interfaces where each performs some subset of confidentiality and integrity policy adjudication. In this instance, the set of Controlled Interfaces adjudicates all of the required integrity and confidentiality policies.
2. While a Controlled Interface is often implemented as a mechanism (or a set of mechanisms) separate from the ISs it is intended to protect, this need not be the case. A Controlled Interface can be constructed so that some of its functionality resides in the ISs themselves. Regardless of its implementation, the Controlled Interface must conform to the requirements provided below.
2. Common Controlled Interface Requirements
1. The DAA shall ensure that:
1. Mechanisms or procedures exist to prohibit general users from modifying the functional capabilities of the Controlled Interface.
2. Automated mechanisms are employed that can monitor the Controlled Interface for symptoms of failure or compromise. The mechanisms shall be protected against failure or compromise.
3. The Controlled Interface is physically protected.
2. Routing information, employed for either controlling the release of outgoing information or the delivery of incoming information, shall be supplied or alterable only by the Security Support Structure of the Controlled Interface.
3. Each Controlled Interface shall be configured and located to facilitate its ability to provide controlled communication between the interconnected systems.
4. Each Controlled Interface shall be configured to ensure that all (incoming and outgoing) communications protocols, services, and communications not explicitly permitted are prohibited.
5. Each Controlled Interface shall be tested to ensure that it satisfies all of the appropriate Controlled Interface criteria listed in this chapter.
6. The Controlled Interface shall be included in a configuration management program. Security policies, procedures, etc., shall be documented.
7. Safeguards shall be provided to assure that users cannot circumvent technical controls.
8. All direct user access to the Controlled Interface shall be audited.
9. Remote administration of the Controlled Interface is discouraged. All remote administration of Controlled Interfaces requires written approval of the DAA. If remote administration is employed, the session must be protected through the use of the following techniques:
1. Strong authentication, and either
2. Physically separate communications paths, or
3. Logically separated communications paths based upon either
1. NSA-approved encryption; or
2. NSA-approved encryption and DAA-approved privacy encryption to provide privacy of the remote administration session.
4. Direct user access to the Controlled Interface shall require strong authentication.
5. The requirements imposed upon Controlled Interfaces do not release the DAA, ISSO, or ISSM of the obligation to ensure that the ISs comprising the interconnected IS provide the required security functionality.
6. The introduction of a Controlled Interface does not impact the determination of the Protection Level or Levels-of-Concern of the ISs comprising the interconnected IS.
3. Controlled Interface Confidentiality Requirements
1. A Controlled Interface shall be required for facilitating the adjudication of confidentiality policies if:
1. The two interconnected ISs are approved to process information of different classifications; and
2. Neither interconnected IS is operating at Protection Level 4 or 5.
2. A Controlled Interface shall be required for facilitating the adjudication of confidentiality policies if:
1. The compartments, sub-compartments, caveats, control markings, or special handling of information processed by one interconnected IS is different than the compartments, sub-compartments, caveats, control markings, or special handling of information processed by the other interconnected IS; and
2. Neither interconnected IS is operating at Protection Levels 3, 4, or 5.
3. At a minimum,* the following confidentiality policy adjudication features shall be provided:

[*One circumstance in which additional security requirements should be considered involves the IS receiving information via the Controlled Interface, which in turn is directly connected to another system accessible by a user holding a lower clearance. This topic is further discussed in paragraph 9.D.3.c(1).]

1. Traffic Review. Review the classification of all outgoing (i.e., going outside of the interconnected IS perimeter) traffic based on associated security labels (where provided) or data content (if applicable) before being released. If labels are used, the Controlled Interface must maintain the integrity of the labels.
2. Controlled Release. Ensure that only traffic that is explicitly permitted (based on traffic review) is released from the perimeter of the interconnected IS.
3. Encryption. Encrypt (as needed) all outgoing communication (including the body and attachment of the communication) with the appropriate level of encryption for the information, transmission medium, and target system.
4. Protection. Ensure that users and processes in a lower protection domain are prevented from accessing information for which they are not authorized that resides in a higher domain. In addition, when information at a higher security level is made available to a lower security level, the information shall be protected and maintained at the higher security level until it satisfies the traffic review and controlled release requirements described above.
5. Audit/Logging. Log all data release activities, to include identity of releaser, identity of recipient, identity of data released, device identifier (id) (e.g., port id), time, and date of release, modification, or application of security labels.
6. Fail-secure. Ensure that the operational failure of the Controlled Interface does not result in any unauthorized release of information outside of the IS perimeter.
4. The Availability Level-of-Concern of each Confidentiality Controlled Interface shall be at least as high as the lowest Availability Level-of-Concern level of the interconnected ISs.
5. In addition to the requirements imposed upon the Controlled Interface, each interconnected IS that is receiving information shall:
1. Be accredited to process the level(s) and compartment(s) of information that it receives.
2. Provide the features and assurances necessary to ensure that information received is made available only to those authorized to receive the information.
6. The security requirements imposed upon Confidentiality Controlled Interfaces are less stringent than those imposed upon PL4 or PL5 systems because Confidentiality Controlled Interfaces are more constrained in their operation and function than complete ISs. The information that flows through the Controlled Interface is generally push only or pull only. In those instances where the Controlled Interface supports both push and pull capabilities, some other constraint limits the bandwidth or format of information flowing through (e.g., information may be limited to a fixed format, or users may be limited to a set of fixed-format queries). Where information is flowing between systems approved to process different security levels or compartments and the information flow is not constrained in some manner similar to that described above, then the requirements of PL3, PL4, or PL5 as appropriate shall be applied.
4. Controlled Interface Integrity Requirements
1. A Controlled Interface facilitating the adjudication of integrity policies shall control all information flows into an interconnected IS. The Controlled Interface shall be required regardless of (1) the Protection Level of the systems comprising the IS; or (2) the Protection Level of the systems comprising the interconnected systems with which it communicates.
2. At a minimum,^* the following integrity policy adjudication features shall be provided:

[*One circumstance in which additional security requirements should be considered involves the IS sending information to the Controlled Interface, which in turn is directly connected to another system accessible by users holding a lower clearance. This topic is further discussed in paragraph 9.D.3.c(1).]

1. Malicious code screening.* Review incoming information for viruses and other malicious code as feasible.

[*Having the Controlled Interface review incoming information for malicious code does not relieve the receiving IS from the responsibility of also checking for malicious code.]

2. Delivery. Ensure that incoming communications have an authorized user (and, as applicable, authorized addresses) as a destination.
3. Filtering. Support and filter communications protocols/services from outside the perimeter of the interconnected IS according to IS-appropriate needs (e.g., filter based on addresses, identity, protocol, authenticated traffic, and applications).
4. Proxies. Support, as appropriate, protocol-mediation software (i.e., proxies) that are able to understand and take protective action based on application-level protocols and associated data streams (e.g., filtering FTP connections to deny the use of the put command, effectively prohibiting the ability to write to an anonymous FTP server).
5. Extensibility. Where appropriate, provide security support for the incorporation of additional system services as they become available.
6. Auditing/Logging. Log data communications into the interconnected IS, to include identity of sender (e.g., person, end-system), identity of recipient (e.g., IP address, host and user), device id (e.g., port id), data, time, and event.
7. Fail-secure. Ensure that in the event of the operational failure of the Controlled Interface, no information external to the interconnected IS shall enter the IS.
3. The Availability Level-of-Concern of each Integrity Controlled Interface shall be at least as high as the Availability Level-of-Concern of the IS into which the information flows are directed.
5. Controlled Interface Platform Protection Requirements. Unless the DAA provides a written exemption, the platform underlying the Controlled Interface mechanism must be able to isolate and protect the Controlled Interface application.
3. Web Security
1. Overview
1. Web technology is that part of network communications in which the parties communicate through the use of the HyperText Transfer Protocol (HTTP) (or some variant).
2. Many organizations are employing Web technology (i.e., HTTP Web servers and clients) to establish intranets and extranets. An intranet is a Web communications system established within limited confines of a given enterprise (e.g., internal to a given business or agency). An extranet is private network using Web technology to share part of an enterprise’s information or operations with suppliers, vendors, partners, customers or other enterprises. The technology employed in intranets and extranets is the same as that employed in the larger World Wide Web, but is confined (usually by controlled interfaces such as firewalls) to a limited audience.
3. Because the Web technology is an enhanced form of network communications, many of the security requirements stated elsewhere in this manual apply directly to the use of Web technology. For example, NSA-approved encryption technology would be required to prevent the exposure of classified information to individuals who are not cleared for the information (see paragraph 1.G.1 and 1.G.2).
2. Securing Web Clients
1. Because of the power of Web technology, the Web client and associated workstation must be appropriately configured and secured. It is particularly important to be sensitive to combinations of unclassified data that in aggregate reveal classified information, and to combinations of information classified at one level that in aggregate reveal more highly classified information.
1. All certificates* shall be protected via passwords that adhere to DAA guidelines or some DAA-approved biometric mechanism.

[*A certificate is an association between an identity and a public key. Certificates are used as a way to verify the authenticity of an organization or individual.]

2. Only DAA-approved certification authorities* shall issue certificates that are installed on ISs that process intelligence information.

[*A Certification Authority is an organization that issues public key certificates.]

3. If the Web client supports other capabilities (e.g., e-mail, collaborative computing, mobile code) in addition to traditional browser capabilities, then the use of these other capabilities shall be consistent with the appropriate guidelines stated elsewhere in this manual or as called for by the DAA.
2. In addition, as Web client updates that address known security flaws become available, the ISSO shall ensure that they are implemented as soon as possible.
4. Securing Servers
1. Various technologies such as Web or file transfer protocol (FTP) provide a convenient means for sharing information. Such technologies are examples of push/pull technology, which allow one entity to push information into a location and another entity to pull it from that location. Documents that an organization wishes to share with other organizations could be placed on (pushed out to) an external Web or FTP server (i.e., outside of the organization’s IS), and then anyone able to access the server could access (pull off) the information. Documents that an organization wishes to share internally could be placed on an internal Web or FTP server (i.e., within an organization’s IS) and then anyone within the organization able to access the server could obtain (pull off) the information.
2. Because such servers are by their nature relatively accessible, they are potentially subject to attacks that could result in modification or destruction of the operating system, or insertion of malicious code. To address these concerns, unless the DAA provides written permission to do otherwise:
1. External servers shall be located external to a site’s Controlled Interface (e.g., firewall) or shall be on a network separate from the site’s intranet.
2. The operating services and programs on servers (external and internal) shall be kept to a minimum, and services that are security risks (e.g., tftp, rlogin, rshell, , ) or not required shall be disabled.
3. The system that supports the server functionality shall, as much as possible, be dedicated to that purpose.
4. All operating system, protocol and application (e.g., FTP and Web) security patches shall be implemented as soon as possible after they become known and their functionality has been tested.
5. Remote access to servers by privileged users requires the use of a strong authentication mechanism, and all such accesses shall be audited.
3. Servers can be delineated into two broad categories: public (i.e., general access) servers and restricted access servers, described below.
1. Public Servers. The information that is placed on a public server shall be limited to general access holdings that can be accessed by anyone who has authorized access to the inter/intranet/LAN on which the server resides. Servers employed as public servers shall implement all of the requirements stated in paragraph 7.D.2, above, and no general user accounts shall be permitted on the server.
2. Restricted Access Servers. The information that is placed on a restricted access server is information which should only be accessed by authorized, authenticated users. In addition to the requirements stated in paragraph 7.D.2, above, restricted access servers shall implement the following security requirements:
1. The underlying operating system shall satisfy the confidentiality requirements of Protection Level 2 or higher, integrity requirements for Basic Level-of-Concern or higher, and availability requirements for Basic Level-of-Concern or higher.
2. Web servers shall implement secure Web technology (e.g., Secure Sockets Layer, Secure HTTP) where capable.
3. Strong authentication shall be required for all users accessing the restricted servers, and all such accesses shall be audited.
5. Mobile Code and Executable Content
1. Mobile code is code obtained from remote systems,* transmitted across a network, and then downloaded onto and executed on a local system. In recent years mobile code has come to refer to Web-based code downloaded onto a user’s client and run by the user’s browser. Examples of such Web-based mobile code include Java, JavaScript, and ActiveX. The larger set of mobile code normally involves an explicit decision to execute – either by the user or by an application. Examples of mobile code that are directly executed by the user include Perl, Tcl/TK, REXX, Python, Java, and platform-specific executables (e.g., *.com, *.exe). Examples of mobile code that are executed by an application with little or no explicit user action include macros, ActiveX, PostScript and Java.

[*In this instance, a remote system would include any system which is physically separate from another IS, but is able to communicate via some data link. This would include systems connected via internets, intranets, client-server local area networks (LANs), etc.]

2. Executable content is the subset of mobile code that is largely invisible to the user and that operates without a user decision. Executable content consists of code that is referenced or embedded in HyperText Markup Language (HTML) and eXtensible Markup Language (XML) page, or an e-mail message. Typically, executable content is automatically activated upon viewing or loading the containing document, without any specific user interaction. The user may be unaware that a separate executable has been downloaded on the user’s machine. Examples of executable content include Java Applets, ActiveX Controls, JavaScript, and VBScript.
3. Hostile mobile code or executable content could be used to introduce viruses or other malicious code, modify programs and allow unauthorized access to a system, corrupt data, or deny service.
4. Hostile mobile code or executable content is completely different from more traditional malicious code such as viruses and worms and is not currently detectable by conventional anti-viral software.
5. Until reliable executable content scanning detection technology* is available (as determined by the DAA) to address the security concerns with regard to mobile code or executable content obtained via the Web, the following requirements apply:

[*Anticipated security enhancements to Web-based mobile code or executable content include mobile code or executable content that is digitally signed (so as to identify the author) and constrained by the browser so that the privileges granted to the mobile code or executable content would be based on who signed the code/content, from where it was downloaded and other factors which could be tailored by an ISSO/M to the needs of the specific environment. Also under development are tools that would search for the signatures of known malicious mobile code or executable content, in a manner analogous to the way current anti-viral software detects viruses.]

1. All mobile code or executable content employed within an intelligence intranet enclave shall be registered within that enclave unless the DAA authorizes otherwise.
2. As feasible, organizations shall implement a code review and quality control process for deployed mobile code or executable content and shall be responsible for the mobile code or executable content that they deploy.
3. For those instances where there is no operational need to download mobile code or executable content, the ISSO or appropriate privileged user shall configure the IS or Controlled Interface to prevent the downloading of mobile code or executable content.
4. Unless a written exception is granted by the DAA, organizations shall not run mobile code or executable content on mission-critical information systems.
5. Downloading of mobile code or executable content from a system that processes information of a different classification level shall only be permitted if a Controlled Interface appropriately configured to handle such a download is in place, and with the written approval of the DAA.
6. Electronic Mail (E-mail)
1. Encryption and E-Mail. E-mail shall conform to the electronic communications and transmission requirements regarding confidentiality stated elsewhere in this manual. In particular, an e-mail message (and associated attachments) shall be appropriately encrypted if during its transmission it may be accessible to individuals who lack either clearance or formal access approval for the information contained in the e-mail (and associated attachments).
2. Viruses and E-mail
1. The DAA shall ensure that the threat of viruses in e-mail or attachments is addressed.
2. Where technically feasible the DAA shall require the use of anti-viral mechanisms to detect and eradicate viruses in incoming and outgoing e-mail and attachments.
3. The means employed to address the virus threat shall be stated in the SSP.
4. The use of anti-viral procedures and mechanisms to detect and eradicate viruses transported by e-mail or attachments does not relieve the ISSO of ensuring that there are procedures and mechanisms (e.g., central choke points where diskettes are scanned for viruses prior to distribution within the IS) in place to safeguard against virus infection of the IS from other sources.
7. Collaborative Computing
1. Collaborative computing allows members of a work group to share electronically any information, applications, and hardware to accomplish group assignments. Examples of collaborative computing mechanisms include shared white boards, application sharing, LAN-based video and audio conferencing, screen sharing, and text chatter. Collaborative computing may be done in either a peer-to-peer manner, in which user workstations act as servers to other group users, or in a client-server manner, in which user workstations connect to a common server where the data sharing is handled.
2. If not correctly configured, collaborative computing technologies can allow a user to see and hear everything happening at another user’s workstation area, or to read, modify, and delete any information on or accessible to a user’s workstation.
3. Until collaborative computing technologies incorporate security capabilities (e.g., I&A, access control, auditing) to the satisfaction of the DAA, the following requirements apply:
1. Collaborative computing mechanisms shall be hosted only on systems operating at Protection Levels 1, 2, and 3, and between systems that process information of the same classifications. But hosting collaborative computing mechanisms on systems operating at Protection Level 3 requires the explicit, written approval of the DAA, and the DAA may impose additional technical or other security safeguards as needed.
2. Collaborative computing mechanisms shall not be remotely activated. Activation requires an explicit action by the workstation user (e.g., in the case of a desktop video teleconference, the user of the desktop shall be required to take an explicit action to turn on the camera and microphone, remote users shall not be allowed to activate a user’s camera or microphone remotely).
3. Peer-to-peer collaborative computing mechanisms between systems operating at Protection Level 2 shall be configured to ensure that only the information on the screen is observable to the remote user. Information located elsewhere on the workstation shall not be observable, nor shall the remote user be able to modify or delete any information on the workstation. These restrictions also apply to any other IS to which the user’s workstation is logically connected (e.g., any logically mounted disks).
4. Collaborative computing mechanisms that provide video and/or audio conference capabilities shall provide some explicit indication that the video and audio mechanisms are operating.
5. Running collaborative computing mechanisms on mission-critical systems is discouraged and shall require explicit, written DAA approval.
6. The server portion of the client-server collaborative computing mechanism shall authenticate all users or processes acting on their behalf.
7. While conducting a collaborative computing session, the user shall take all reasonable measures to ensure that no sensitive information is inadvertently made either audibly or visually accessible to the collaborative computing mechanism. This includes advising all personnel in the immediate area that the collaborative computing mechanism will be operating.
8. Once the collaborative session is completed, the user shall immediately take an explicit action to disconnect/terminate the collaborative computing mechanism.
9. Users shall not leave the workstation unattended while a peer-to-peer collaborative computing mechanism is in progress.
8. Distributed Processing. Distributed processing systems can be considered single or network systems, and can be handled in accordance with the guidelines provided in Chapters 4, 5, 6, and 8. Distributed parallel processing occurs when an application on one IS divides a task into two or more parts and then sends the parts to the other ISs on the network for processing. This allows the idle CPU cycles on many ISs to be used for CPU intensive calculations. The results are then sent back to the originating IS for final processing. Distributed parallel processing should be restricted to Protection Level 1 and Basic Level of concern networks, and not be permitted on mission critical systems.
8. ADMINISTRATIVE SECURITY REQUIREMENTS
1. Overview. The security requirements specified in this chapter are in addition to those identified in Chapters 4, 5, 6, and 7.
2. Procedural Security
1. Security Training, Education, and Awareness
1. Security education, training, and awareness are essential to a successful IS security program. Employees who are informed of applicable organizational policies and procedures can be expected to act effectively to ensure the security of system resources. Instruction is more effective when targeted to a specific audience. General users require different training than those employees with specialized responsibilities.
2. All individuals involved in the Certification and Accreditation (C&A) process shall be trained in that process and in its documentation requirements.
1. As a minimum, training shall include the following:
1. System security regulations and policies (individuals shall have the ability to implement and interpret national and agency/department regulations and policies).
2. Common information security technologies and practices.
3. Testing and evaluation techniques.
4. Risk management concepts.
5. Interconnected systems security concepts.
6. Procedures for incident handling.
7. C&A concepts, policies, and procedures.
8. Audit analysis procedures and tools.
2. In addition to the requirements specified in (1), above, DAAs and DAA Reps shall have the following training:
1. General information security orientation. An overview of what is expected of the person in this position, to include: infrastructure, risk management, the responsibility for accepting risks and the consequences, residual risks, basic security requirements, Protection Levels and Levels-of-Concern, C&A process.
2. Software protection and validation techniques.
3. In addition to the requirements specified in (1) above, ISSMs shall have training in the destruction and release procedures for systems, components, and media.
4. In addition to the requirements specified in (1) above, ISSOs shall have the following training:
1. How to implement common information systems security practices and technologies. This training shall include information on support infrastructures, help teams, and organizations that could assist the ISSO.
2. How to implement testing and evaluation procedures.
3. How to implement configuration management concepts.
4. Destruction and release procedures for systems, components, and media.
5. Other security disciplines that affect the ISSO's operations.
3. The following individuals shall be trained in their responsibilities and those of their subordinates:
1. Privileged Users, with training to include:
1. How to protect the physical area, media, and equipment (e.g., locking doors, care of diskettes).
2. How to protect authenticators and operate the applicable system security features.
3. Security consequences and costs so that security can be factored into their decisions (manager).
4. How to implement and use specific access control products (system administrators).
5. How to recognize and report potential security vulnerabilities, threats, security violations, or incidents.
6. The organization's policy for protecting information and systems and the roles and responsibilities of various organizational units with which they may have to interact.
7. The system security regulations and policies.
8. What constitutes misuse or abuse of system privileges.
2. General Users, with training to include:
1. How to protect the physical area, media, and equipment (e.g., locking doors, care of diskettes).
2. How to protect authenticators and operate the applicable system security features.
3. How to recognize and report security violations and incidents.
4. The organization's policy for protecting information and systems.
2. Marking and Labeling. This subsection sets forth the policy and procedures for use of security markings and labels of system media that may contain classified information under the purview of the signatories of this manual. It implements Information Security Oversight Office (ISOO) Directive 1. It specifies the use of standard external labels for identifying the security classification of removable IS media. Any downgrading or declassification of media shall be clearly reflected in its markings and shall be documented.
1. Marking Storage Media
1. Removable information storage media shall bear external labels indicating the security classification of the information and applicable associated security markings, such as handling caveats and dissemination control labels. SSPs shall identify the removable storage media to be used with a system. Classified removable media shall be controlled and protected in a manner similar to that used for classified paper materials. Removable media shall be marked as classified if the media has ever been used on the classified system, AND during any use on the system, was writeable (i.e., the write-protect feature could not be verified).
1. In those areas, designated in the SSP, where classified information is processed, unmarked media that are not in factory-sealed packages shall be protected at the highest level of classification processed within the facility, until the media has been reviewed and appropriately labeled.
2. In those areas, designated in the SSP, where both classified and unclassified information are processed or stored, unclassified media labels (SF 710) shall be used to identify media that contain only unclassified information.
2. Non-removable information storage media shall bear external labels indicating the security classification of the information and applicable associated security markings, such as handling caveats and dissemination control labels. If it is difficult to mark the non-removable media itself, the labels described below may be placed in a readily visible position on the cabinet enclosing the media.
3. External Labels
1. For a system operating at Protection Level 1, 2, or 3, storage media shall bear external labels indicating the highest classification level and applicable associated security markings of information ever processed on the system, unless a reliable human review of the media's entire contents is performed.
2. For a system operating at Protection Level 4 or 5, storage media shall be labeled with the classification level and applicable associated security markings of information on the media.
2. Marking Hardware Components. Procedures identified in the SSP shall be implemented to ensure that all components of an IS, including input/output devices that have the potential for retaining information,* terminals, standalone microprocessors, and word processors used as terminals, bear a conspicuous, external label stating the highest classification level and most restrictive classification category of the information accessible to the component in the IS. This labeling may consist of permanent markings on the component or a sign placed on the terminal.

[*For example, mice and trackballs do not normally retain information.]

3. Marking Human-Readable Output. Human-readable output shall be marked appropriately, on each human-readable page, screen, or equivalent (e.g., the proper classification must appear on each classified microfiche and on each page of text on the fiche).
1. Adding a Banner Page. Except as provided by the DAA, the first page of the output (the banner page) shall include a warning message reminding the person receiving the output to control every page according to the markings on the banner page until a reliable human review has determined that the output is marked appropriately.
1. If the capability to provide automatic banner pages does not exist, procedures shall be developed to mark manually or otherwise assure review of printed output, as appropriate.
2. Using procedures approved by the Data Owner or responsible official, explicit approval shall be obtained from the DAA or his designee before forwarding output, which has not had a reliable human review for appropriate security classification and marking, to recipients who do not have system access. Such approval(s) can be for a specific release, for the overall release procedure(s), or for both.
2. Marking Printed Output. Individual pages of output shall be marked as appropriate either (a) to reflect the classification and applicable associated security markings of the data that is printed on each page, or (b) with the highest classification and all applicable associated security markings of the data that is to be printed.
3. Marking Output From Shared Printers
1. At the DAA's discretion, systems operating at Protection Level 1, 2, or 3 shall mark the beginning (banner) page of all human-readable, paged, hardcopy output (printer output) with a human-readable representation of the system's security parameter, which is the highest classification and all appropriate associated security markings of the information processed by the system. For Protection Level 3, procedures shall be implemented to ensure output is given only to authorized users.
2. For systems that operate at Protection Level 4 or 5, the banner page of output shall be marked with the appropriate level of classification contained in the document produced.
4. Variations. DAAs or their designees may identify specific types of media or hardware components that need not be marked in accordance with this policy so long as they remain within a single, secure environment, and:
1. All systems are operating at the same classification level and access authorizations;
2. The media or hardware components are documented in the SSP;
3. Mechanisms or procedures have been established to provide the security protection intended by this policy; and
4. If removed from the single, secure environment, the media are either appropriately marked or sanitized or declassified in accordance with paragraph 8.B.5, below.
5. Removable system media shall be externally marked with the established classification label (or a facsimile of it), specified in Table 8-1 and published by the Information Security Oversight Office (ISOO).
   

Table 8-1 Classification Labeling

Label	Color1	Form Number	Size2
CLASSIFIED SCI	Yellow(101)	SF 712 (10-87)	2.500" by 1.375"
TOP SECRET	Orange(165)	SF 706 ( 1-87)	2.125" by 1.250"
SECRET	Red(186)	SF 707 ( 1-87)	2.125" by 1.250"
CONFIDENTIAL	Blue(286)	SF 708 ( 1-87)	2.125" by 1.250"
UNCLASSIFIED	Green(356)	SF 710 ( 1-87)	1.938" by 1.183"

Notes

1 Color tones should be similar to the industry standard Pantone Matching System (PMS) ink colors that correspond to the listed PMS reference numbers.

2 ISOO is considering publishing classification labels that are half of the size of the current labels while continuing publication of the current labels. The half-size classification labels would be developed to accommodate new types of portable IS media that have been introduced since October 1987.

6. Definition. For the purposes of this subsection, the term portable system media means cassette tapes, floppy disks, cartridge disks, reel tapes, hard disks, compact disks, optical disks, and other removable system devices that store non-volatile data.
7. Implementation. Security labels shall be conspicuously placed on media; however, their placement must not adversely affect the operation of the equipment on which the media is used. A security label may be placed on the protective cover rather than on the media only if labeling the media would impair operation or if the media is too small to accommodate a label. The intent of marking is to provide a visible indicator of content to support proper handling and storage of the media.
8. The security marking does not replace internal classification control detail. DAAs or their designees shall approve any other identifying marking (e.g., library retrieval number/locator) to be placed externally on the media.
9. The downgrading or declassification instructions applicable to the data contained on the portable system media shall accompany the data when it is transferred from one security control point to another. These instructions may be internal to the media.
3. Manual Review of Human-Readable Output. Before human-readable output is released outside the security boundary, an appropriately authorized individual shall provide a reliable human review of the output to determine whether it is accurately marked with the appropriate classification and applicable associated security markings. The authorized reviewer shall be knowledgeable enough about the data to determine the presence of improper data in the information being reviewed, and shall be cleared for and have formal access approval for he information being reviewed. The review shall be at a level of detail, as set forth by the DAA, to allow the reviewer to accept security responsibility for releasing the data to its recipient.
1. The electronic output (i.e., softcopy) to be released outside the security boundary shall be verified by a review (in human-readable form) of all data including embedded text (e.g., headers and footers, hidden text, notes, edited text, control characters) before being released.
2. Information on media that is not in human-readable form (e.g., embedded graphics, sound, video, imagery) shall be examined for content with the appropriate software, hardware, and firmware. Care is required to ensure that all layers or levels of the graphics or image are reviewed.
3. Random or representative sampling techniques may be used to verify the proper marking of large volumes of output.
4. If available, automated techniques approved by the DAA may be used to verify the proper output marking of data.
4. Media Accountability. Media accountability shall be implemented that provides a set of protection mechanisms comparable to those required for equivalent paper documents.
5. Media Clearing and Sanitization. Storage media shall be physically controlled and safeguarded in the manner prescribed for the most-sensitive designation, or highest classification level, and category of data ever recorded on it until destroyed or sanitized using approved procedures. The SSP shall specify the approved release procedure for the media of a given system. Procedures to be used for the sanitization, declassification, and reuse of storage media are described below:
1. Clearing vs. Sanitizing vs. Destroying Media
1. Clearing is the process of eradicating the data on the media before reusing the media in an environment that provides an acceptable level of protection for the data that was on the media before clearing. In general, laboratory techniques allow the retrieval of information that has been cleared, but normal operations do not allow such retrieval. Purging or sanitizing is the process of removing the data from the media before reusing the media in an environment that does not provide an acceptable level of protection for the data that was on the media before purging or sanitizing. In general, laboratory techniques cannot retrieve data that has been purged or sanitized. Destroying is the process of physically damaging the media so that it is not usable as media, and so that no known method can retrieve data from it.
2. Overwriting, clearing, purging, degaussing, and sanitizing are not synonymous with declassification. Declassification is the separate administrative process resulting in a determination that given media no longer requires protection as classified information. Procedures for declassifying media require DAA approval.
1. Overwriting Media
1. Overwriting is a software process that replaces the data previously stored on magnetic storage media with a predetermined set of meaningless data. Overwriting is an acceptable method for clearing.
2. Several factors can reduce the effectiveness of overwriting. These include ineffectiveness of the overwrite procedures, equipment failure (e.g., misalignment of read/write heads), and inability to overwrite bad sectors or tracks or information in inter-record gaps.
3. To clear magnetic disks, overwrite all locations three times (the first time with a random character, the second time with a specified character, and the third time with the complement of that specified character).
2. Degaussing Media
1. Degaussing (i.e., demagnetizing) is a procedure that reduces the magnetic flux on media virtually to zero by applying a reverse magnetizing field. Properly applied, degaussing renders any previously stored data on magnetic media unreadable and may be used in the sanitization process. Degaussing is more effective than overwriting magnetic media.
2. Magnetic media are divided into three types based on their coercivity. Coercivity of magnetic media defines the magnetic field necessary to reduce a magnetically saturated material's magnetization to zero. Type I degaussers are used to degauss Type I media (i.e., media whose coercivity is no greater than 350 Oersteds [Oe]). Type IIa degaussers are used to degauss Type IIa media (i.e., media whose coercivity is no greater than 900 Oe). Currently, no degaussers can effectively degauss all Type III media (i.e., media whose coercivity is over 900 Oe). Some degaussers are rated up to 1700 Oe, but their specific approved rating must be determined prior to use. The correct use of degaussing products improves assurance that data is no longer retrievable and that inadvertent disclosure will not occur.
3. Refer to the current issue of NSA's Information Systems Security Products and Services Catalogue (Degausser Products List Section) for the identification of degaussers acceptable for the procedures specified in this manual. The vendor will provide test procedures to verify continued compliance. The ISSM, using these vendor-supplied test procedures, shall ensure testing at least annually of these products to verify that they continue to meet their manufacturers’ specifications.
3. Sanitizing Media. Sanitization removes information from media or equipment so that data recovery using any known techni