AC-4(26)_audit-filtering-actions

DevOps & Security

When transferring information between different security domains, record and audit content filtering actions and results for the information being fil

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AC-4(26) Audit Filtering Actions

Enhancement of: AC-4

High-Level Description

Family: Access Control (AC) Framework: NIST SP 800-53 Rev 5

Content filtering is the process of inspecting information as it traverses a cross-domain solution and determines if the information meets a predefined policy. Content filtering actions and the results of filtering actions are recorded for individual messages to ensure that the correct filter actions were applied. Content filter reports are used to assist in troubleshooting actions by, for example, determining why message content was modified and/or why it failed the filtering process. Audit events are defined in AU-2 . Audit records are generated in AU-12.

What to Check

Verify AC-4(26) Audit Filtering Actions is documented in SSP
Confirm control is operating effectively
Review evidence of continuous monitoring for AC-4(26)
Verify enhancement builds upon base control AC-4

How to Test

Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for AC-4(26) implementation details. Verify the organization has documented how this control is satisfied.

Step 2: Validate Implementation

# For cloud environments, use cloud-audit-mcp tools
# For on-premises, review system configurations directly

# Example: Check if account management policies exist
grep -r "account.management\|access.control" /etc/security/ 2>/dev/null

Step 3: Test Operating Effectiveness

Verify the control is actively functioning, not just documented. Check logs, configurations, and operational evidence.

Tools

Tool	Purpose	Usage
cloud-audit-mcp	Check IAM policies and access controls	`cloud_audit_iam_policies`
hackbrowser-mcp	Test web application access controls	`browser_auth_test`

Remediation Guide

Control Statement

When transferring information between different security domains, record and audit content filtering actions and results for the information being filtered.

Implementation Guidance

Risk Assessment

Finding	Severity	Impact
AC-4(26) Audit Filtering Actions not implemented	High	Access Control
AC-4(26) partially implemented	Medium	Incomplete Access Control

CWE Categories

CWE ID	Title
CWE-284	Improper Access Control

References

Checklist

Control documented in SSP
Implementation evidence collected
Operating effectiveness validated
Continuous monitoring in place
Related controls (AU-2, AU-3, AU-12) reviewed