AC-4(8)—Security And Privacy Policy Filters
>Control Description
Enforce information flow control using ⚙organization-defined security or privacy policy filters as a basis for flow control decisions for ⚙organization-defined information flows; and
[Selection (one or more): Block; Strip; Modify; Quarantine] data after a filter processing failure in accordance with ⚙organization-defined security or privacy policy.
>Cross-Framework Mappings
>Supplemental Guidance
Organization-defined security or privacy policy filters can address data structures and content. For example, security or privacy policy filters for data structures can check for maximum file lengths, maximum field sizes, and data/file types (for structured and unstructured data). Security or privacy policy filters for data content can check for specific words, enumerated values or data value ranges, and hidden content.
Structured data permits the interpretation of data content by applications. Unstructured data refers to digital information without a data structure or with a data structure that does not facilitate the development of rule sets to address the impact or classification level of the information conveyed by the data or the flow enforcement decisions. Unstructured data consists of bitmap objects that are inherently non-language-based (i.e., image, video, or audio files) and textual objects that are based on written or printed languages.
Organizations can implement more than one security or privacy policy filter to meet information flow control objectives.
>Assessment Interview Topics
Questions assessors commonly ask
Process & Governance:
- •What formal policies and procedures govern the implementation of AC-4(8) (Security And Privacy Policy Filters)?
- •Who are the designated roles responsible for implementing, maintaining, and monitoring AC-4(8)?
- •How frequently is the AC-4(8) policy reviewed and updated, and what triggers policy changes?
- •What training or awareness programs ensure personnel understand their responsibilities related to AC-4(8)?
Technical Implementation:
- •Describe the specific technical mechanisms or controls used to enforce AC-4(8) requirements.
- •What automated tools, systems, or technologies are deployed to implement AC-4(8)?
- •How is AC-4(8) integrated into your system architecture and overall security posture?
- •What configuration settings, parameters, or technical specifications enforce AC-4(8) requirements?
Evidence & Documentation:
- •What documentation demonstrates the complete implementation of AC-4(8)?
- •What audit logs, records, reports, or monitoring data validate AC-4(8) compliance?
- •Can you provide evidence of periodic reviews, assessments, or testing of AC-4(8) effectiveness?
- •What artifacts would you present during a FedRAMP assessment to demonstrate AC-4(8) compliance?
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