AC-4(5)—Embedded Data Types
>Control Description
Enforce ⚙organization-defined limitations on embedding data types within other data types.
>Cross-Framework Mappings
>Supplemental Guidance
Embedding data types within other data types may result in reduced flow control effectiveness. Data type embedding includes inserting files as objects within other files and using compressed or archived data types that may include multiple embedded data types. Limitations on data type embedding consider the levels of embedding and prohibit levels of data type embedding that are beyond the capability of the inspection tools.
>Assessment Interview Topics
Questions assessors commonly ask
Process & Governance:
- •What formal policies and procedures govern the implementation of AC-4(5) (Embedded Data Types)?
- •Who are the designated roles responsible for implementing, maintaining, and monitoring AC-4(5)?
- •How frequently is the AC-4(5) policy reviewed and updated, and what triggers policy changes?
- •What training or awareness programs ensure personnel understand their responsibilities related to AC-4(5)?
Technical Implementation:
- •Describe the specific technical mechanisms or controls used to enforce AC-4(5) requirements.
- •What automated tools, systems, or technologies are deployed to implement AC-4(5)?
- •How is AC-4(5) integrated into your system architecture and overall security posture?
- •What configuration settings, parameters, or technical specifications enforce AC-4(5) requirements?
Evidence & Documentation:
- •What documentation demonstrates the complete implementation of AC-4(5)?
- •What audit logs, records, reports, or monitoring data validate AC-4(5) compliance?
- •Can you provide evidence of periodic reviews, assessments, or testing of AC-4(5) effectiveness?
- •What artifacts would you present during a FedRAMP assessment to demonstrate AC-4(5) compliance?
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