SV-242463r961863: The Kubernetes API Server must be set to audit log maximum backup. | Kubernetes STIG SCAP Benchmark

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Assessment Title

Rule Text

The Kubernetes API Server must be set to audit log maximum backup.

Description

Discussion Text

The Kubernetes API Server must set enough storage to retain logs for monitoring suspicious activity and system misconfiguration, and provide evidence for Cyber Security Investigations.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366

References

DPMS Target Kubernetes DISA DPMS Target Kubernetes 5376

Checks

DISA STIG (Manual Reference)

Change to the /etc/kubernetes/manifests/ directory on the Kubernetes Control Plane. Run the command:
grep -i audit-log-maxbackup * 

If the setting "audit-log-maxbackup" is not set in the Kubernetes API Server manifest file or it is set less than "10", this is a finding.

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.kubernetes:def:242463
# The Kubernetes API Server must be set to audit log maximum backup.
# 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)[ -]*audit-log-maxbackup=(\d+)/\1/p' '/etc/kubernetes/manifests/kube-apiserver.yaml')" -ge 10 ]
}

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.kubernetes:def:242463


FILE="/etc/kubernetes/manifests/kube-apiserver.yaml"
PATTERN="^(?i)[ -]*audit-log-maxbackup=(\\d+)$"
MIN_BACKUP=10

if [ ! -f "$FILE" ]; then
  echo "PASS"
  exit 0
fi

content=$(cat "$FILE")
matches=$(grep -E "$PATTERN" <<< "$content")

if [ -n "$matches" ]; then
  backup=$(echo "$matches" | awk -F'=' '{print $2}')
  if [ "$backup" -ge "$MIN_BACKUP" ]; then
    echo "PASS"
  else
    echo "FAIL"
  fi
  exit 1
else
  echo "FAIL"
  exit 1
fi

Remediation

Edit the Kubernetes API Server manifest file in the /etc/kubernetes/manifests directory on the Kubernetes Control Plane. Set the value of "--audit-log-maxbackup" to a minimum of "10".