SC-3(2)—Access And Flow Control Functions
>Control Description
Isolate security functions enforcing access and information flow control from nonsecurity functions and from other security functions.
>Supplemental Guidance
Security function isolation occurs because of implementation. The functions can still be scanned and monitored. Security functions that are potentially isolated from access and flow control enforcement functions include auditing, intrusion detection, and malicious code protection functions.
>Assessment Interview Topics
Questions assessors commonly ask
Process & Governance:
- •What policies govern the implementation of access and flow control functions?
- •How are system and communications protection requirements defined and maintained?
- •Who is responsible for configuring and maintaining the security controls specified in SC-3(2)?
Technical Implementation:
- •How is access and flow control functions technically implemented in your environment?
- •What systems, tools, or configurations enforce this protection requirement?
- •How do you ensure that access and flow control functions remains effective as the system evolves?
Evidence & Documentation:
- •What documentation demonstrates the implementation of SC-3(2)?
- •Can you provide configuration evidence or system diagrams showing this protection control?
- •What logs or monitoring data verify that this control is functioning correctly?
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