AC-4(28)—Linear Filter Pipelines
>Control Description
When transferring information between different security domains, implement a linear content filter pipeline that is enforced with discretionary and mandatory access controls.
>Supplemental Guidance
Content filtering is the process of inspecting information as it traverses a cross-domain solution and determines if the information meets a predefined policy. The use of linear content filter pipelines ensures that filter processes are non-bypassable and always invoked. In general, the use of parallel filtering architectures for content filtering of a single data type introduces bypass and non-invocation issues.
>Assessment Interview Topics
Questions assessors commonly ask
Process & Governance:
- •What formal policies and procedures govern the implementation of AC-4(28) (Linear Filter Pipelines)?
- •Who are the designated roles responsible for implementing, maintaining, and monitoring AC-4(28)?
- •How frequently is the AC-4(28) policy reviewed and updated, and what triggers policy changes?
- •What training or awareness programs ensure personnel understand their responsibilities related to AC-4(28)?
Technical Implementation:
- •Describe the specific technical mechanisms or controls used to enforce AC-4(28) requirements.
- •What automated tools, systems, or technologies are deployed to implement AC-4(28)?
- •How is AC-4(28) integrated into your system architecture and overall security posture?
- •What configuration settings, parameters, or technical specifications enforce AC-4(28) requirements?
Evidence & Documentation:
- •What documentation demonstrates the complete implementation of AC-4(28)?
- •What audit logs, records, reports, or monitoring data validate AC-4(28) compliance?
- •Can you provide evidence of periodic reviews, assessments, or testing of AC-4(28) effectiveness?
- •What artifacts would you present during a FedRAMP assessment to demonstrate AC-4(28) compliance?
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