SV-258158r1263516: RHEL 9 must take action when allocated audit record storage volume reaches 95 percent of the audit record storage capacity. | Red Hat Enterprise Linux 9 STIG SCAP Benchmark

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Assessment Title

Rule Text

RHEL 9 must take action when allocated audit record storage volume reaches 95 percent of the audit record storage capacity.

Description

Discussion Text

If action is not taken when storage volume reaches 95 percent utilization, the auditing system may fail when the storage volume reaches capacity. While "%" is fully compliant for auditd.conf, you must account for how auditd processes it. The percentage-to-megabyte conversion occurs only when the audit daemon starts. If you dynamically resize the underlying logical volume/partition where /var/log/audit resides while the system is running, the daemon will not automatically know. You must reload it to trigger a recalculation.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-001855

References

DPMS Target Red Hat Enterprise Linux 9 DISA DPMS Target Red Hat Enterprise Linux 9 5551

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

#!/bin/bash
# Reconstructed from oval:mil.disa.stig.rhel9os:def:258158
# RHEL 9 must take action when allocated audit record storage volume reaches 95 percent of the audit record storage capacity.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# /etc/audit/auditd.conf: admin_space_left = 5%
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  (sed -En 's/(?i)^\s*admin_space_left\s*=\s*(\S+)\s*(?:#.*)?$/\1/p' '/etc/audit/auditd.conf') | grep -qxF '5%'
}

if test_1; then
  echo "PASS"
else
  echo "FAIL"
fi

Assessment Script Powered by AISandbox-executed

A standalone Shell script to assess this control automatically. Review before running it in your environment.

Syntax-checked and actually executed in an isolated sandbox (not the real system this checks) — confirmed to run without errors.

#!/bin/sh
# OVAL Definition: oval:mil.disa.stig.rhel9os:def:258158

if [ ! -f "/etc/audit/auditd.conf" ]; then
  echo "PASS"
  exit 0
fi

if grep -qE "(?i)^\\s*admin_space_left\\s*=\\s*(\\S+)\\s*$" /etc/audit/auditd.conf; then
  match=$(grep -E "(?i)^\\s*admin_space_left\\s*=\\s*(\\S+)\\s*$" /etc/audit/auditd.conf | sed's/.*=\s*//g')
  if [ "$match" = "5%" ]; then
    echo "PASS"
    exit 0
  fi
fi

echo "FAIL"
exit 1

Remediation

Configure RHEL 9 to initiate an action when allocated audit record storage volume reaches 95 percent of the repository maximum audit record storage capacity by adding/modifying the following line in the /etc/audit/auditd.conf file.

admin_space_left  = 5%