SV-242446r961863: The Kubernetes conf files must be owned by root. | Kubernetes STIG SCAP Benchmark

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Assessment Title

Rule Text

The Kubernetes conf files must be owned by root.

Description

Discussion Text

The Kubernetes conf 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. Many of the security settings within the document are implemented through this file.

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 Kubernetes conf files by using the command:

stat -c %U:%G /etc/kubernetes/admin.conf | grep -v root:root
stat -c %U:%G /etc/kubernetes/scheduler.conf | grep -v root:root
stat -c %U:%G /etc/kubernetes/controller-manager.conf | grep -v root:root

If the command returns any non root:root file permissions, 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:242446


files=("admin.conf" "scheduler.conf" "controller-manager.conf")

for file in "${files[@]}"; do
    path="/etc/kubernetes/$file"
    if [ ! -f "$path" ]; then
        echo "PASS"
        exit 0
    fi
    owner=$(stat -c "%U" "$path")
    group=$(stat -c "%G" "$path")
    if [ "$owner" = "root" ] && [ "$group" = "root" ]; then
        echo "PASS"
        exit 0
    fi
done

echo "FAIL"
exit 1

Remediation

Change the ownership of the conf files to root: root by executing the command:

chown root:root /etc/kubernetes/admin.conf 
chown root:root /etc/kubernetes/scheduler.conf 
chown root:root /etc/kubernetes/controller-manager.conf