User:Shawndouglas/sandbox/sublevel14

Appendix 1. A simplified description of NIST Special Publication 800-53 controls, with ties to LIMSpec

What follows is essentially a simplification of the NIST control descriptions found in NIST Special Publication 800-53, Revision 5: Security and Privacy Controls for Information Systems and Organizations. As mentioned earlier, most of the "Low" baseline controls, as well as select "Moderate" and "High" baseline controls, are worthy of consideration for most any systems and organizations. Also worth noting again is that if the NIST SP 800-53 controls and framework is too technical for your tastes, a simplified version was derived from 800-53 by NIST in the form of NIST Special Publication 800-171, Revision 2: Protecting Controlled Unclassified Information in Nonfederal Systems and Organizations. In addition to making the controls and methodology a bit easier to understand, NIST includes a mapping table in Appendix D of 800-171 which maps its security requirements to both NIST SP 800-53 (Revision 4, with plans to update it to Revision 5) and ISO/IEC 27001. As such, you're able to not only see how it connects to the more advanced document but also to the International Organization for Standardization's international standard "for establishing, implementing, maintaining and continually improving an information security management system within the context of the organization." For an even broader, more simplified NIST approach to 800-53, you may rather want to turn to the NIST Cybersecurity Framework, which is suitable for those without a technical background.

The general format used in Appendix 1 is to first separate the control descriptions by their NIST family, then their control name. Occasionally, you will also see selected NIST control enhancements in the form of NIST family, the control enhancement number in parentheses, the control name, and then the control enhancement name. Then, a simplified description—with occasional outside references—is added, based on the original text. Additional resources are included, where applicable. Those resources are typically based on references NIST used in making its framework, or additional resources that help you, the reader, gain additional context.

Finally, if you are implementing or have implemented information management software in your laboratory, you may also find links to LIMSpec in the additional resources. The LIMSpec has seen a handful of iterations over the years, but its primary goal remains the same: to provide software requirements specifications for the ever-evolving array of laboratory informatics systems being developed. We attempted to link NIST's security and privacy controls to specific software requirements specifications in LIMSpec. It should be noted that some 40+ NIST controls could not be directly linked to a software specification in LIMSpec. In almost every single case, those non-linked items reflect as organizational policy rather than an actual software specification. If a LIMSpec comparison was made, you'll find a link to the relevant section. If no LIMSpec comparison could be made, you'll see something like "No LIMSpec comp (organizational policy rather than system specification)." (Note that the selected control enhancements largely appear in this appendix because they both have a comp to LIMSpec and don't have a tight relation to another NIST control.)

In some cases the LIMSpec comparison may seem slightly confusing. For example, all NIST controls encouraging the establishment of policy and procedure are linked to LIMSpec 7.1 and 7.2. LIMSpec 7.1 states "the system shall be capable of creating, managing, and securely holding a variety of document types, while also allowing for the review and approval of those documents using version and release controls." To be clear, it's not that any particular software system itself conforms to the NIST controls specifying policies be created and managed. Rather, this particular software specification ensures that any software system built to meet the specification will provide the means for creating and managing policies and procedures, which in hand aids the organization in conforming to the NIST controls specifying policies be created and managed.

NOTE: Under "Additional resources," occasionally a guide, brochure, or blog post from a particular company will appear. That guide or brochure is added solely because it provides contextual information about the specific NIST control. The inclusion as a resource of such a guide, brochure, or blog post should not be considered an endorsement for the company that published it.

Appendix 1.1 Access control

AC-1 Policy and procedures

This control recommends the organization develop, document, disseminate, review, and update an access control policy. Taking into account regulations, standards, policy, guidance, and law, this policy essentially details the security controls and enhancements "that specify how access is managed and who may access information under what circumstances."

Additional resources:

• NIST Access Control Policy and Implementation Guides
• NIST Special Publications 800-12, Rev. 1, page 59
• OWASP Authorization Cheat Sheet
• LIMSpec 7.1, 7.2

AC-2 Account management

This control recommends the organization develop a series of account management steps for its information systems. Among its many recommendations, it asks the organization to clearly define account types (e.g., individual, group, vendor, temporary, etc.), their associated membership requirements, and policy dictating how accounts should be managed; appoint one or more individuals to be in charge of account creation, approval, modification, compliance review, and removal; and provide proper communication to those account managers when an account needs to be modified, disabled, or removed.

Additional resources:

• AAA Technical Writing LLC Sample Account Management Policy
• NIST Special Publication 1800-18 (Draft)
• No LIMSpec comp (organizational policy rather than system specification)

AC-2 (3) Account management: Disable accounts

This control enhancement recommends the system have the ability to automatically disable specific accounts (i.e., expired, unassociated, in-violation, and inactive) after a designated period of time.

Additional resources:

• LIMSpec 32.28

AC-2 (4) Account management: Automated audit actions

This control enhancement recommends the system have the ability to automatically audit creation, modification, enabling, disabling, and removal actions performed on accounts, as well as notify designated individuals or roles of those actions.

Additional resources:

• LIMSpec 9.2

AC-2 (7) Account management: Privileged user accounts

This control enhancement recommends the organization take additional action in regards to accounts with privileged roles. AC-2 (7) defines privileged roles as "organization-defined roles assigned to individuals that allow those individuals to perform certain security-relevant functions that ordinary users are not authorized to perform." The organization should not only use a role-based mechanism for assigning privileges to an account, but also the organization should monitor the activities of privileged accounts and manage those accounts when the role is no longer appropriate.

Additional resources:

• LIMSpec 32.35 and 34.4

AC-2 (11) Account management: Usage conditions

This control enhancement recommends the system allow for the configuration of specific usage conditions or circumstances under which an account type can be used. Conditions or circumstances for account activity may include physical location, logical location, network address, or chronometric criterion (time of day, day of week/month).

Additional resources:

• LIMSpec 32.23

AC-3 Access enforcement

This control recommends the system be capable of enforcing system access based upon the configured access controls (policies and mechanisms) put into place by the organization. This enforcement could occur at the overall information system level, or be more granular at the application and service levels.

Additional resources:

• LIMSpec 32.25, 32.35, 34.4, and 35.3

AC-3 (7) Access enforcement: Role-based access control

This control enhancement recommends the system be able to effectively monitor and enforce a role-based access control policy to objects and system functions, as well users of a defined role. However, this requires system administrators and organizational managers work together to ensure only those permissions critical to supporting "organizational missions or business functions" are enacted upon the assignable roles, and that those assigned roles are appropriate for the user account.

Additional resources:

• LIMSpec 32.23

AC-6 Least privilege

This control recommends the organization use the principle of "least privilege" when implementing and managing accounts in the system. The concept of least privilege essentially "requires giving each user, service, and application only the permissions needed to perform their work and no more."

Additional resources:

• CISA Least Privilege (archived)
• Netwrix Best Practice Guide to Implementing the Least Privilege Principle
• LIMSpec 36.4

AC-6 (1) Least privilege: Authorize access to security functions

This control enhancement recommends the organization provide access to specific security-related functions and information in the system to explicitly authorized personnel. In other words, one or more specific system administrators, network administrators, security officers, etc. should be given access to configure security permissions, monitoring, cryptographic keys, services, etc. required to ensure the system is correctly protected.

Additional resources:

• LIMSpec 32.18

AC-6 (4) Least privilege: Separate processing domains

This control enhancement recommends the system provide separate processing domains in order to make user privilege allocation more granular. This essentially means that through using virtualization, domain separation mechanisms, or separate physical domains, the overall information system can create additional fine layers of access control for a particular domain.

Additional resources:

• LIMSpec 21.16

AC-6 (9) Least privilege: Log use of privileged functions

This control enhancement recommends the system perform auditing functions on any privileged functions that get executed in the system. This allows organizations to review audit records to ensure the effects of intentional or unintentional misuse of privileged functions is caught early and mitigated effectively.

Additional resources:

• Centrify Privileged User Activity Auditing (archived)
• LIMSpec 9.2

AC-7 Unsuccessful logon attempts

This control recommends the system be capable of not only enforcing a specific number of failed logon attempts in a given period of time, but also automatically locking or disabling an account until released by the system after a designated period of time, or manually by an administrator.

Additional resources:

• Microsoft "Account lockout threshold" (Specific to Windows 10 and 11, but information still broadly useful)
• LIMSpec 32.32

AC-8 System use notification

This control recommends the system be configurable to allow the creation of a system-wide notification message or banner before logon that provides vital privacy, security, and authorized use information related to the system. The message or banner should remain on the screen until acknowledged by the user and the user logs on. Note that the wording of such message or banner may require legal review and approval before implementation.

Additional resources:

• LIMSpec 32.30

AC-10 Concurrent session control

This control recommends the system be able to limit the number of concurrent (running at the same time) sessions (log ins) globally, for a given account type, for a given a user, or by using a combination of such limiters. NIST gives the example of wanting to tighten security by limiting the number of concurrent sessions for system administrators or users working in domains containing sensitive data.

Additional resources:

• OWASP Session Management Cheat Sheet
• LIMSpec 32.29

AC-11 Device lock

This control recommends the system be able to prevent further access to a system using a device lock, which activates after a defined period of inactivity or upon a user request. AC-11 defines a device lock as "temporary actions taken to prevent logical access to organizational systems when users stop work and move away from the immediate vicinity of those systems but do not want to log out because of the temporary nature of their absences." The device lock must be able to remain in place until the user associated with the session again goes through the system's identification and authentication process.

Additional resources:

• LIMSpec 34.1

AC-12 Session termination

This control recommends the system be able to automatically terminate a user session after a defined period of time or pre-defined events (e.g., time-of-day restriction) occur.

Additional resources:

• LIMSpec 34.1

AC-14 Permitted actions without identification or authentication

This control recommends the organization develop a list of user actions, if any, that can be performed on the system without going through the system's identification and authentication process. Any such list should be documented and provide supporting rationale as to why the authentication can be bypassed. This may largely pertain to public websites or other publicly accessible systems.

Additional resources:

• No LIMSpec comp (organizational policy rather than system specification)

AC-17 Remote access

This control recommends the organization develop and document a remote access policy that addresses each type of remote access allowed into the system. Remote access involves communicating with the system through an external network, usually the internet. The policy should address the usage restrictions, configuration requirements, connection requirements, and implementation rules for the approved methods (e.g., wireless, broadband, Bluetooth, etc.). Some sort of access enforcement process should take place prior to allowing remote access (see AC-3 for said access enforcement).

Additional resources:

• NIST Special Publications 800-46, Rev. 2
• NIST Special Publications 800-113
• NIST Special Publications 800-114, Rev. 1
• NIST Special Publications 800-121, Rev. 2
• No LIMSpec comp (organizational policy rather than system specification)

AC-17 (1) Remote access: Monitoring and control

This control enhancement recommends the system have the ability to automatically monitor and control remote access methods. By enabling the automatic auditing of the connection activity of remote users, compliance with remote access policies (see AC-17) can be ensured and cyber attacks caught early.

Additional resources:

• LIMSpec 21.9

AC-17 (2) Remote access: Protection of confidentiality and integrity using encryption

This control enhancement recommends the system have the ability to implement encryption mechanisms for remote access. This involves using "encryption to protect communications between the access device and the institution," using encryption "to protect sensitive data residing on the access device," or both.

Additional resources:

• LIMSpec 21.12 and 35.1

AC-18 Wireless access

This control recommends the organization develop and document a wireless access policy, probably best done in conjunction with AC-17. NIST gives examples of wireless technologies such as microwave, packet radio, 802.11x, and Bluetooth. The policy should address the usage restrictions, configuration requirements, connection requirements, and implementation rules for the approved wireless technologies. Some sort of access enforcement process should take place prior to allowing a wireless connection to the system (see AC-3 for said access enforcement). In most cases this will be a built-in authentication protocol for the wireless network.

Additional resources:

• NIST Special Publications 800-97
• NIST Special Publications 800-121, Rev. 2
• NIST Special Publications 800-187
• No LIMSpec comp (organizational policy rather than system specification)

AC-19 Access control for mobile devices

This control recommends the organization develop and document a mobile device (e.g., smart phone, tablet, e-reader) use and access policy. The policy should address the usage restrictions, configuration requirements, connection requirements, and implementation rules for the approved wireless technologies. Some sort of access enforcement process should take place prior to allowing a mobile connection to the system (see AC-3 for said access enforcement).

Additional resources:

• NIST Special Publications 800-114, Rev. 1
• NIST Special Publications 800-124, Rev. 1
• NIST Special Publications 800-164, Draft
• No LIMSpec comp (organizational policy rather than system specification)

AC-20 Use of external systems

This control recommends the organization develop and document a policy concerning the use of external systems to access, process, store, and transmit data from the organization's system. External systems include (but are not limited to) personal devices, private or public computing devices in commercial or public facilities, non-federal government systems, and federal systems not operated or owned by the organization. This includes the use of cloud-based service providers. The organization should consider the trust relationships already established with internal business divisions, as well as contractors and other third parties when developing this policy.

• No LIMSpec comp (organizational policy rather than system specification)

AC-22 Publicly accessible content

This control recommend the organization develop and document policy on the use and management of public-facing components of the system, typically the public website. This control ensures that sensitive, protected, or classified information is not accessible by the general public. The organizational policy should address who's responsible for posting information to the public-facing system; how to verify the information being posted does not contain sensitive, protected, or classified information; and how to monitor the public-facing system to ensure any non-public information is removed upon discovery.

• No LIMSpec comp (organizational policy rather than system specification)

Appendix 1.2 Awareness and training

AT-1 Policy and procedures

This control recommends the organization develop, document, disseminate, review, and update security training policies and procedures. It asks organizations to not only address the purpose, scope, roles, responsibilities, and enforcement of security training but also to address how it will be implemented, reviewed, and updated.

Additional resources:

• NIST Special Publications 800-12, Rev. 1, pages 59–60
• NIST Special Publications 800-50
• NIST Special Publications 800-100, pages 26–34
• LIMSpec 7.1, 7.2

AT-2 Literacy training and awareness

This control recommends the organization provide the necessary basic security awareness training as part of initial training, as well as follow-up training, when the system changes, or at a specific mandated frequency. This broadly applies to all information system users and includes the use of training material, informational posters, security reminders and notices, system messages, and awareness events towards meeting the requirements of this control. Ideally, the training and awareness efforts will also be updated periodically and incorporate internal and external "lessons learned."

Additional resources:

• NIST Special Publications 800-50
• LIMSpec 8.3, 8.4, 8.5, and 8.7

AT-3 Role-based training

This control recommends the organization provide the necessary role-specific security and privacy training to personnel with specific assigned security roles and responsibilities. The training should occur before authorization to access the system is provided, as well as when the system changes or at a specific mandated frequency. This includes the use of training material, policy and procedure documents, role-based security tools, manuals, and other materials towards meeting the requirements of this control. Ideally, the training and awareness efforts will also be updated periodically and incorporate internal and external "lessons learned."

Additional resources:

• NIST Special Publications 800-16
• NIST Special Publications 800-50
• LIMSpec 8.3, 8.4, 8.5, and 8.7

AT-4 Training records

This control recommends the organization document and monitor basic and role-specific security training activities and retain that information for a designated period of time. Note that record retention requirements may vary based on regulations and standards that affect the organization and its operations.

Additional resources:

• LIMSpec 8.1, 8.5, and 31.4

Appendix 1.3 Audit and accountability

AU-1 Policy and procedures

This control recommends the organization develop, document, disseminate, review, and update audit and accountability policies and procedures. It asks organizations to not only address the purpose, scope, roles, responsibilities, and enforcement of audit and accountability action but also to address how those policies and procedures will be implemented, reviewed, and updated.

Additional resources:

• NIST Special Publications 800-12, Rev. 1, page 60
• State of North Carolina Audit and Accountability Policy
• LIMSpec 7.1, 7.2

AU-2 Event logging

This control recommends the organization scrutinize the information system to ensure it's fully capable of logging the events the organization requires to meet its business, cybersecurity, and regulatory goals. It also recommends the organization find common ground within other areas of the organization to improve selection of loggable events, provide rationale for their selection, and implement within the information system the selected loggable events at the recommended frequency or during a specific situation. NIST SP 800-53, Rev. 5 also notes: "Audit records can be generated at various levels, including at the packet level as information traverses the network. Selecting the appropriate level of event logging is an important part of a monitoring and auditing capability and can identify the root causes of problems."

Additional resources:

• NIST Special Publications 800-92
• LIMSpec 9.2, 9.3, and 9.4

AU-3 Content of audit records

This control recommends the system be capable of generating audit records that, at a minimum, provide the source of an event, who enacted an event, when it was enacted, where it occurred, what occurred, and what the outcome was. Regulations and standards may dictate what must be recorded beyond those aspects.

Additional resources:

• LIMSpec 9.2, 9.3, and 9.4

AU-4 Audit log storage capacity

This control recommends the organization allocate sufficient resources to ensure the storage capacity of the system is sufficient to hold all its audit logging records. What that storage capacity should be will be most heavily dictated by data retention regulations and standards (see AU-11), followed by available organizational resources to commit to long-term storage. Additional safeguards such as sending warning messages to designated personnel or system roles when storage space reaches a critical minimum may be useful.

Additional resources:

• No LIMSpec comp (organizational policy rather than system specification)

AU-5 Response to audit logging processes failures

This control recommends the system be able to alert specific personnel or system roles when an audit logging process fails and take action as specified by the organization. This action includes shutting down the system, overwriting the oldest audit record (because storage capacity is maxed), or discontinuing the generation of audit records. The system should also allow the organization to specify action differently for various types of failures.

Additional resources:

• LIMSpec 31.8

AU-6 Audit record review, analysis, and reporting

This control recommends the organization—as part of policy—review, analyze, and report on the results from generated system audit records at defined frequencies, focusing on inappropriate or unusual activity that may compromise the security of the system. The finding may be reported to designated individuals within the organization, designated departments within the organization, or even regulatory bodies outside the organization.

Additional resources:

• LIMSpec 9.7

AU-6 (1) Audit record review, analysis, and reporting: Automated process integration

This control enhancement recommends the organization implement some sort of automation into their system to better integrate audit review, analysis, and reporting processes with organizational investigation processes (e.g., incident response, continuous monitoring, etc.) in order to better and more quickly respond to cyber threats.

Additional resources:

• LIMSpec 16.7

AU-8 Time stamps

This control recommends the system use a reliable system clock for generating its audit records. The system clock should be able to generate time stamps in Coordinated Universal Time (UTC) or Greenwich Mean Time (GMT) and meet organizational requirements for granularity, all the way down to the millisecond level.

Additional resources:

• LIMSpec 9.3 and 31.5

AU-9 Protection of audit information

This control recommends the system be capable of logically protecting audit information (records, settings, and reports) and tools from unauthorized access, modification, and deletion.

Additional resources:

• LIMSpec 31.7

AU-10 Non-repudiation

This control recommends the system provide an irrefutable means of linking specific system actions or processes (e.g., signing a report or approving a sample) to a specific individual. This can include the use of digital signatures or other specific means of associating identity with action.

Additional resources:

• LIMSpec 9.5, 9.6
• LIMSpec 32.7, 32.36, 32.37

AU-10 (3) Non-repudiation: Chain of custody

This control enhancement recommends that a system maintaining chain of custody information also accurately maintain the credentials of reviewers and releasers of information related to that chain of custody, or in the case of automated process, that only approved review and release functions are used by the system.

Additional resources:

• LIMSpec 1.18
• LIMSpec 4.4
• LIMSpec 32.36, 32.37

AU-11 Audit record retention

This control recommends the organization, in tandem with the its overall record retention policy, retain audit records for a defined period of time. That time period may be dictated by administrative, operational, or regulatory policy.

Additional resources:

• National Archives Federal Records Management and General Records Schedules
• LIMSpec 31.4

AU-11 (1) Audit record retention: Long-term retrieval capability

This control enhancement recommends the organization ensure the availability and retrievability of audit information stored long-term. This assurance can be made in several ways, including verifying the information system is correctly providing access to the information to authorized individuals; ensuring records in old, difficult-to-read formats get updated; and retaining the necessary documentation and hardware to read and interpret older record systems.

Additional resources:

• LIMSpec 31.4

AU-12 Audit record generation

This control aligns with AU-2 and AU-3, in as much as it recommends the system be capable of generating audit records for the auditable events defined in AU-2 at various organization-defined points in the information system. This control also recommends the system to allow authorized users to assign which auditable events are to be audited by which points in the system. And of course, the system should be capable of generating the audit records with the content as defined in AU-3.

Additional resources:

• LIMSpec 9.7

Appendix 1.4 Assessment, authorization, and monitoring

CA-1 Policy and procedures

This control recommends the organization develop, document, disseminate, review, and update security assessment and authorization policies and procedures. It asks organizations to not only address the purpose, scope, roles, responsibilities, and enforcement of security assessment and authorization action but also to address how those policies and procedures will be implemented, reviewed, and updated.

Additional resources:

• NIST Special Publications 800-12, Rev. 1, pages 60–61
• NIST Special Publications 800-37, Rev. 2
• NIST Special Publications 800-53A, Rev. 5
• NIST Special Publications 800-100, pages 96–112
• LIMSpec 7.1, 7.2

CA-2 Control assessments

This control recommends the organization develop, document, disseminate, review, and update a control assessment plan. This plan is focused on helping the organization ensure the assessment procedures, environment, team, roles, and responsibilities are defined and the security controls are correctly implemented, operating as intended, and meeting the established security requirements. The assessments should happen at defined frequency. Additionaally, the organization is encouraged to report on the results of the implemented plan and corresponding assessments, disseminating the results to authorized personnel or roles.

Additional resources:

• NIST Special Publications 800-37, Rev. 2
• NIST Special Publications 800-39
• NIST Special Publications 800-53A, Rev. 5
• NIST Special Publications 800-115
• NIST Special Publications 800-137
• No LIMSpec comp (organizational policy rather than system specification)

CA-2 (1) Control assessments: Independent assessors

This control enhancement recommends the organization employ some type of independent assessment team with a predetermined level of required independence to conduct security control assessments. Ensuring the team is free from perceived or actual conflict of interest is important, and NIST adds that "[a]ssessments performed for purposes other than to support authorization decisions are more likely to be useable for such decisions when performed by assessors with sufficient independence, thereby reducing the need to repeat assessments."

Additional resources:

• NIST Special Publications 800-115, pages 6-5 and 6-6
• No LIMSpec comp (organizational policy rather than system specification)

CA-3 Information exchange

This control recommends the organization should explicitly authorize, document, review, and update interconnection security agreements (ISA) or system-based security plans, as they relate to the interconnection of information systems in the organization. Separately, in NIST SP 800-47, Rev. 1, at 3.1.5.1, NIST defines an ISA an an established agreement between owner-operators of connected IT systems to document and agree to the technical requirements associated with establishing, operating, and maintaining any interconnections between the organizations' systems. However, NIST notes, "[i]f systems that exchange information have the same authorizing official, organizations need not develop agreements. Instead, the interface characteristics between the systems (e.g., how the information is being exchanged, how the information is protected) are described in the respective security and privacy plans."

Additional resources:

• NIST Special Publications 800-47, Rev. 1
• NIST Special Publications 800-100, pages 46–58
• No LIMSpec comp (organizational policy rather than system specification)

CA-5 Plan of action and milestones

This control recommends the organization develop and update a security authorization-related plan of action and milestones for the documentation of planned remedial actions and vulnerability resolutions. These key security authorization documents should be reviewed and updated at a defined frequency, based off the results of security control assessments, security impact analyses, and continuous monitoring results.

Additional resources:

• NIST Special Publications 800-37, Rev. 2
• No LIMSpec comp (organizational policy rather than system specification)

CA-6 Authorization

This control recommends the organization assign a manager or member of senior leadership as an "authorizing official" that essentially approves the system to be put into operation based on the results of security assessments and accepts responsibility for the risks associated with operation. The authorization should also be updated at a defined frequency. It's important to note that this control is described by NIST as being a "federal responsibility, and therefore, authorizing officials must be federal employees." If applying this control to non-federal systems, there is still plenty of sense in designating a key individual in the organization as responsible for making the call post-security assessment of allowing the system to go live, as well as accepting the risks of putting the system into operation. The same principle can be applied to major security upgrades and reconfiguration of existing systems.

Additional resources:

• NIST Special Publications 800-37, Rev. 2
• NIST Special Publications 800-137
• No LIMSpec comp (organizational policy rather than system specification)

CA-7 Continuous monitoring

This control recommends the organization develop a continuous monitoring program and implementation strategy. The program should define the metrics required for organizational performance indicators, as well as how often those metrics are applied and assessed for functionality and sufficiency. How the information is analyzed and correlated, how the organization responds to those activities, and how they are reported (who and when) must also be addressed. Metrics should follow the SMART principle of being specific, measurable, actionable, relevant, and focused on a timely nature.

Additional resources:

• NIST Special Publications 800-37, Rev. 2
• NIST Special Publications 800-39
• NIST Special Publications 800-53A, Rev. 5
• NIST Special Publications 800-115
• NIST Special Publications 800-137
• No LIMSpec comp (organizational policy rather than system specification)

CA-9 Internal system connections

This control recommends the organization essentially create a systems map, documenting how the various parts of the system should interconnect—as well as the characteristics of the connection and the nature of the information transported through it—and explicitly authorizing the interconnection to occur. This includes connections through mobile devices, printers, computers, sensors, and servers. It may be useful to classify components of the system that have common characteristics or configurations to make authorizations (as classes) easier.

Additional resources:

• No LIMSpec comp (organizational policy rather than system specification)