AU-5(3)_configurable-traffic-volume-thresholds

DevOps & Security

Enforce configurable network communications traffic volume thresholds reflecting limits on audit log storage capacity and [organization-defined] netwo

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AU-5(3) Configurable Traffic Volume Thresholds

Enhancement of: AU-5

High-Level Description

Family: Audit and Accountability (AU) Framework: NIST SP 800-53 Rev 5

Organizations have the capability to reject or delay the processing of network communications traffic if audit logging information about such traffic is determined to exceed the storage capacity of the system audit logging function. The rejection or delay response is triggered by the established organizational traffic volume thresholds that can be adjusted based on changes to audit log storage capacity.

What to Check

Verify AU-5(3) Configurable Traffic Volume Thresholds is documented in SSP
Confirm control is operating effectively
Review evidence of continuous monitoring for AU-5(3)
Verify enhancement builds upon base control AU-5

How to Test

Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for AU-5(3) 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 logging configuration	`cloud_audit_logging`
AWS CLI	Review CloudTrail/CloudWatch	`aws cloudtrail describe-trails`

Remediation Guide

Control Statement

Enforce configurable network communications traffic volume thresholds reflecting limits on audit log storage capacity and [organization-defined] network traffic above those thresholds.

Implementation Guidance

Risk Assessment

Finding	Severity	Impact
AU-5(3) Configurable Traffic Volume Thresholds not implemented	Medium	Audit and Accountability
AU-5(3) partially implemented	Low	Incomplete Audit and Accountability

CWE Categories

CWE ID	Title
CWE-778	Insufficient Logging

References

Checklist

Control documented in SSP
Implementation evidence collected
Operating effectiveness validated
Continuous monitoring in place
Related controls (none) reviewed