SV-242457r961863: The Kubernetes kubelet config must be owned by root. | Kubernetes STIG SCAP Benchmark

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Assessment Title

Rule Text

The Kubernetes kubelet config must be owned by root.

Description

Discussion Text

The Kubernetes kubelet agent registers nodes with the API Server and performs health checks to containers within pods. If this file can be modified, the information system would be unaware of pod or container degradation.

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 Kubeadm kubelet conf file by using the command:

stat -c %U:%G /var/lib/kubelet/config.yaml| 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.

#!/bin/bash
# Reconstructed from oval:mil.disa.stig.kubernetes:def:242457
# The Kubernetes kubelet config must be owned by root.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# file_object (file_test)
test_1() {
  ( [ "$(stat -c '%g' '/var/lib/kubelet/config.yaml')" -eq 0 ] ) && ( [ "$(stat -c '%u' '/var/lib/kubelet/config.yaml')" -eq 0 ] )
}

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:242457
if [ ! -f "/var/lib/kubelet/config.yaml" ]; then echo "PASS"; exit 0; fi; uid=$(stat -c %u "/var/lib/kubelet/config.yaml"); gid=$(stat -c %g "/var/lib/kubelet/config.yaml"); if [ $uid -eq 0 ] && [ $gid -eq 0 ]; then echo "PASS"; exit 0; else echo "FAIL"; exit 1; fi

Remediation

Change the ownership of the kubelet config to "root: root" by executing the command:

chown root:root /var/lib/kubelet/config.yaml