AC-4(27)—Redundant/Independent Filtering Mechanisms
>Control Description
When transferring information between different security domains, implement content filtering solutions that provide redundant and independent filtering mechanisms for each data type.
>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. Redundant and independent content filtering eliminates a single point of failure filtering system. Independence is defined as the implementation of a content filter that uses a different code base and supporting libraries (e.g., two JPEG filters using different vendors' JPEG libraries) and multiple, independent system processes.
>Assessment Interview Topics
Questions assessors commonly ask
Process & Governance:
- •What formal policies and procedures govern the implementation of AC-4(27) (Redundant/Independent Filtering Mechanisms)?
- •Who are the designated roles responsible for implementing, maintaining, and monitoring AC-4(27)?
- •How frequently is the AC-4(27) policy reviewed and updated, and what triggers policy changes?
- •What training or awareness programs ensure personnel understand their responsibilities related to AC-4(27)?
Technical Implementation:
- •Describe the specific technical mechanisms or controls used to enforce AC-4(27) requirements.
- •What automated tools, systems, or technologies are deployed to implement AC-4(27)?
- •How is AC-4(27) integrated into your system architecture and overall security posture?
- •What configuration settings, parameters, or technical specifications enforce AC-4(27) requirements?
Evidence & Documentation:
- •What documentation demonstrates the complete implementation of AC-4(27)?
- •What audit logs, records, reports, or monitoring data validate AC-4(27) compliance?
- •Can you provide evidence of periodic reviews, assessments, or testing of AC-4(27) effectiveness?
- •What artifacts would you present during a FedRAMP assessment to demonstrate AC-4(27) compliance?
Ask AI
Configure your API key to use AI features.