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AC-3(15)—Discretionary And Mandatory Access Control

>Control Description

a

Enforce ⚙organization-defined mandatory access control policy over the set of covered subjects and objects specified in the policy; and

b

Enforce ⚙organization-defined discretionary access control policy over the set of covered subjects and objects specified in the policy.

>Supplemental Guidance

Simultaneously implementing a mandatory access control policy and a discretionary access control policy can provide additional protection against the unauthorized execution of code by users or processes acting on behalf of users. This helps prevent a single compromised user or process from compromising the entire system.

>Related Controls

AC-4
SC-2
SC-3

>Assessment Interview Topics

Questions assessors commonly ask

Process & Governance:

  • •What formal policies and procedures govern the implementation of AC-3(15) (Discretionary And Mandatory Access Control)?
  • •Who are the designated roles responsible for implementing, maintaining, and monitoring AC-3(15)?
  • •How frequently is the AC-3(15) policy reviewed and updated, and what triggers policy changes?
  • •What training or awareness programs ensure personnel understand their responsibilities related to AC-3(15)?

Technical Implementation:

  • •Describe the specific technical mechanisms or controls used to enforce AC-3(15) requirements.
  • •What automated tools, systems, or technologies are deployed to implement AC-3(15)?
  • •How is AC-3(15) integrated into your system architecture and overall security posture?
  • •What configuration settings, parameters, or technical specifications enforce AC-3(15) requirements?

Evidence & Documentation:

  • •What documentation demonstrates the complete implementation of AC-3(15)?
  • •What audit logs, records, reports, or monitoring data validate AC-3(15) compliance?
  • •Can you provide evidence of periodic reviews, assessments, or testing of AC-3(15) effectiveness?
  • •What artifacts would you present during a FedRAMP assessment to demonstrate AC-3(15) compliance?

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