au-5-1-storage-capacity-warning

name	AU-5(1)_storage-capacity-warning
description	Provide a warning to [organization-defined] within [organization-defined] when allocated audit log storage volume reaches [organization-defined] of re
category	information-gathering
version	5.2.0
author	cyberstrike-official
tags	["nist","sp800-53","rev5","au-5-1","au","enhancement"]
tech_stack	["aws","azure","gcp","linux","windows"]
cwe_ids	["CWE-778"]
chains_with	[]
prerequisites	["AU-5"]
severity_boost	{}

AU-5(1) Storage Capacity Warning

Enhancement of: AU-5

High-Level Description

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

Organizations may have multiple audit log storage repositories distributed across multiple system components with each repository having different storage volume capacities.

What to Check

• Verify AU-5(1) Storage Capacity Warning is documented in SSP
• Confirm control is operating effectively
• Review evidence of continuous monitoring for AU-5(1)
• 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(1) 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

Provide a warning to [organization-defined] within [organization-defined] when allocated audit log storage volume reaches [organization-defined] of repository maximum audit log storage capacity.

Implementation Guidance

Organizations may have multiple audit log storage repositories distributed across multiple system components with each repository having different storage volume capacities.

Risk Assessment

Finding