NIST 800-53 REV 5 • ACCESS CONTROL
AC-4(29) — Filter Orchestration Engines
When transferring information between different security domains, employ content filter orchestration engines to ensure that: Content filtering mechanisms successfully complete execution without errors; and Content filtering actions occur in the correct order and comply with {{ insert: param, ac-04.29_odp }}.
CMMC Practice Mapping
No direct CMMC mapping
NIST 800-171 Mapping
No direct NIST 800-171 mapping
Related Controls
No related controls listed
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 security policy. An orchestration engine coordinates the sequencing of activities (manual and automated) in a content filtering process. Errors are defined as either anomalous actions or unexpected termination of the content filter process. This is not the same as a filter failing content due to non-compliance with policy. Content filter reports are a commonly used mechanism to ensure that expected filtering actions are completed successfully.
Practitioner Notes
Filter orchestration engines coordinate multiple filters and manage the workflow between them. Rather than a simple linear pipeline, the orchestrator can route data to different filters based on content type or risk level.
Example 1: Deploy an ICAP (Internet Content Adaptation Protocol) server that your proxy forwards content to for inspection. The ICAP server routes files to the appropriate scanner — executables go to the sandbox, documents to the DLP engine, images to the steganography detector.
Example 2: In a SOAR platform (Splunk SOAR, Palo Alto XSOAR), build playbooks that orchestrate multiple scanning services. When a suspicious file is detected, the playbook submits it to VirusTotal, detonates it in a sandbox, and checks file hash against your threat intelligence platform — all in parallel. Results are aggregated for a disposition decision.