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SC-23(5)Session Authenticity | Allowed Certificate Authorities

IL5
IL6

>Control Description

Only allow the use of organization-defined certificate authorities for verification of the establishment of protected sessions.

>DoD Impact Level Requirements

No specific parameter values or requirements for this impact level.

>Discussion

Reliance on certificate authorities for the establishment of secure sessions includes the use of Transport Layer Security (TLS) certificates. These certificates, after verification by their respective certificate authorities, facilitate the establishment of protected sessions between web clients and web servers.

>Related Controls

>Assessment Interview Topics

Questions assessors commonly ask

Process & Governance:

  • What policies govern the implementation of allowed certificate authorities?
  • How are system and communications protection requirements defined and maintained?
  • Who is responsible for configuring and maintaining the security controls specified in SC-23(5)?

Technical Implementation:

  • How is allowed certificate authorities technically implemented in your environment?
  • What systems, tools, or configurations enforce this protection requirement?
  • How do you ensure that allowed certificate authorities remains effective as the system evolves?
  • How are session timeouts and termination controls configured?

Evidence & Documentation:

  • What documentation demonstrates the implementation of SC-23(5)?
  • Can you provide configuration evidence or system diagrams showing this protection control?
  • What logs or monitoring data verify that this control is functioning correctly?
  • Can you show session management configuration settings?

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