The Kubernetes PKI CRT must have file permissions set to 644 or more restrictive.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-242466	CNTR-K8-003330	SV-242466r961863_rule		Medium

Description

The Kubernetes PKI directory contains all certificates (.crt files) supporting secure network communications in the Kubernetes Control Plane. If these files can be modified, data traversing within the architecture components would become unsecure and compromised.

STIG	Date
Kubernetes Security Technical Implementation Guide	2024-08-22

Details

Check Text (C-45741r927138_chk)

Review the permissions of the Kubernetes PKI cert files by using the command:

sudo find /etc/kubernetes/pki/* -name "*.crt" | xargs stat -c '%n %a'

If any of the files have permissions more permissive than "644", this is a finding.

Fix Text (F-45699r918202_fix)

Change the ownership of the cert files to "644" by executing the command:

find /etc/kubernetes/pki -name "*.crt" | xargs chmod 644