SV-242408r960960: The Kubernetes manifest files must have least privileges. | Kubernetes STIG SCAP Benchmark

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Assessment Title

Rule Text

The Kubernetes manifest files must have least privileges.

Description

Discussion Text

The manifest files contain the runtime configuration of the API server, scheduler, controller, and etcd. If an attacker can gain access to these files, changes can be made to open vulnerabilities and bypass user authorizations inherent within Kubernetes with RBAC implemented. Satisfies: SRG-APP-000133-CTR-000310, SRG-APP-000133-CTR-000295, SRG-APP-000516-CTR-001335

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

IA Controls

NIST SP 800-53

Not mappedCCI-001499Not mappedCCI-000366

References

DPMS Target Kubernetes DISA DPMS Target Kubernetes 5376

Checks

DISA STIG (Manual Reference)

On both Control Plane and Worker Nodes, change to the /etc/kubernetes/manifest directory. Run the command:
ls -l *

Each manifest file must have permissions "644" or more restrictive.

If any manifest file is less restrictive than "644", 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.

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:242408
manifest_dir="/etc/kubernetes/manifests"
if [ ! -d "$manifest_dir" ]; then echo "PASS"; exit 0; fi
for file in "$manifest_dir"/*; do
  if [ ! -f "$file" ]; then continue; fi
  perms=$(stat -c "%a" "$file")
  if [ "$perms" -eq 644 ]; then continue; else echo "FAIL"; exit 1; fi
done
echo "PASS"
exit 0

Remediation

On both Control Plane and Worker Nodes, change to the /etc/kubernetes/manifest directory. Run the command:
chmod 644 *

To verify the change took place, run the command:
ls -l *

All the manifest files should now have privileges of "644".