SV-258154r1038966: RHEL 9 audit system must take appropriate action when the audit storage volume is full. | Red Hat Enterprise Linux 9 STIG SCAP Benchmark

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Assessment Title

Rule Text

RHEL 9 audit system must take appropriate action when the audit storage volume is full.

Description

Discussion Text

It is critical that when the operating system is at risk of failing to process audit logs as required, it takes action to mitigate the failure. Audit processing failures include software/hardware errors; failures in the audit capturing mechanisms; and audit storage capacity being reached or exceeded. Responses to audit failure depend upon the nature of the failure mode.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000140

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:258154
# RHEL 9 audit system must take appropriate action when the audit storage volume is full.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# textfilecontent54_object (textfilecontent54_test)
test_1() {
  ( (sed -En 's/(?i)^\s*disk_full_action\s*=\s*(\w+)\s*(?:#.*)?$/\1/p' '/etc/audit/auditd.conf') | grep -Pq '(?i)^syslog$' ) || ( (sed -En 's/(?i)^\s*disk_full_action\s*=\s*(\w+)\s*(?:#.*)?$/\1/p' '/etc/audit/auditd.conf') | grep -Pq '(?i)^single$' ) || ( (sed -En 's/(?i)^\s*disk_full_action\s*=\s*(\w+)\s*(?:#.*)?$/\1/p' '/etc/audit/auditd.conf') | grep -Pq '(?i)^halt$' )
}

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:258154
if [ ! -f "/etc/audit/auditd.conf" ]; then echo "PASS"; exit 0; fi
grep -q "^disk_full_action = HALT$" /etc/audit/auditd.conf || grep -q "^disk_full_action = SYSLOG$" /etc/audit/auditd.conf && echo "PASS" || echo "FAIL"
exit 0

Remediation

Configure RHEL 9 to shut down by default upon audit failure (unless availability is an overriding concern).

Add or update the following line (depending on configuration "disk_full_action" can be set to "SYSLOG" or "SINGLE" depending on configuration) in "/etc/audit/auditd.conf" file:

disk_full_action = HALT

If availability has been determined to be more important, and this decision is documented with the information system security officer (ISSO), configure the operating system to notify SA staff and ISSO staff in the event of an audit processing failure by setting the "disk_full_action" to "SYSLOG".