cis-k8s-v1120-1-1-21

name	cis-k8s-v1120-1.1.21
description	Ensure that the Kubernetes PKI key file permissions are set to 600 (Manual)
category	cis-k8s
version	1.12.0
author	cyberstrike-official
tags	["cis","kubernetes","control-plane","config-files","pki","keys","permissions","level1"]
cis_id	1.1.21
cis_benchmark	CIS Kubernetes Benchmark v1.12.0
tech_stack	["kubernetes"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

1.1.21 Ensure that the Kubernetes PKI key file permissions are set to 600 (Manual)

Profile Applicability

• Level 1 - Master Node

Description

Ensure that Kubernetes PKI key files have permissions of 600.

Rationale

Kubernetes makes use of a number of key files as part of the operation of its components. The permissions on these files should be set to 600 to protect their integrity and confidentiality.

Impact

None

Audit

Run the below command (based on the file location on your system) on the Control Plane node. For example,

stat -c '%a' /etc/kubernetes/pki/*.key

Verify that the permissions are 600 or more restrictive.

or

ls -l /etc/kubernetes/pki/*.key

Verify that the permissions are -rw------

Remediation

Run the below command (based on the file location on your system) on the Control Plane node. For example,

chmod -R 600 /etc/kubernetes/pki/*.key

Default Value

By default, the keys used by Kubernetes are set to have permissions of 600

References

1. https://kubernetes.io/docs/admin/kube-apiserver/

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	5.4 Restrict Administrator Privileges to Dedicated Administrator Accounts	*	*	*
v7	4 Controlled Use of Administrative Privileges