SV-242460r961863: The Kubernetes admin kubeconfig must have file permissions set to 644 or more restrictive. | Kubernetes STIG SCAP Benchmark

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Assessment Title

Rule Text

The Kubernetes admin kubeconfig must have file permissions set to 644 or more restrictive.

Description

Discussion Text

The Kubernetes admin kubeconfig files contain the arguments and settings for the Control Plane services. These services are controller and scheduler. If these files can be changed, the scheduler will be implementing the changes immediately.

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)

Review the permissions of the Kubernetes config files by using the command:

stat -c %a /etc/kubernetes/admin.conf
stat -c %a /etc/kubernetes/scheduler.conf
stat -c %a /etc/kubernetes/controller-manager.conf

If any of the files are have permissions more permissive 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:242460


if [ ! -d "/etc/kubernetes" ]; then echo "PASS"; exit 0; fi
for file in admin.conf scheduler.conf controller-manager.conf; do
    if [ ! -f "/etc/kubernetes/$file" ]; then echo "PASS"; exit 0; fi
    if [ ! -r "/etc/kubernetes/$file" ] || [ -w "/etc/kubernetes/$file" ] || [ -x "/etc/kubernetes/$file" ]; then echo "FAIL"; exit 1; fi
done
echo "PASS"; exit 0

Remediation

Change the permissions of the conf files to "644" by executing the command:

chmod 644 /etc/kubernetes/admin.conf 
chmod 644 /etc/kubernetes/scheduler.conf
chmod 644 /etc/kubernetes/controller-manager.conf