cis-k8s-v1120-4-1-8

name	cis-k8s-v1120-4.1.8
description	Ensure that the client certificate authorities file ownership is set to root:root (Manual)
category	cis-k8s
version	1.12.0
author	cyberstrike-official
tags	["cis","kubernetes","worker-nodes","worker-node-config","file-permissions"]
cis_id	4.1.8
cis_benchmark	CIS Kubernetes Benchmark v1.12.0
tech_stack	["kubernetes"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

CIS Kubernetes Benchmark v1.12.0 - Control 4.1.8

Description

Ensure that the certificate authorities file ownership is set to root:root.

Rationale

The certificate authorities file controls the authorities used to validate API requests. You should set its file ownership to maintain the integrity of the file. The file should be owned by root:root.

Impact

None

Audit Procedure

Step 1: Find the client-ca-file

Run the following command:

ps -ef | grep kubelet

Find the file specified by the --client-ca-file argument.

Step 2: Verify file ownership

Run the following command:

stat -c %U:%G <filename>

Verify that the ownership is set to root:root.

Remediation

Run the following command to modify the ownership of the --client-ca-file:

chown root:root <filename>

Default Value

By default no --client-ca-file is specified.

References

1. https://kubernetes.io/docs/admin/authentication/#x509-client-certs

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	5.4 Restrict Administrator Privileges to Dedicated Administrator Accounts Restrict administrator privileges to dedicated administrator accounts on enterprise assets.		●	●
v7	4 Controlled Use of Administrative Privileges Controlled Use of Administrative Privileges

Profile Applicability

• Level 1 - Worker Node

Assessment Status

Manual