cis-k8s-v1120-4-1-6

name	cis-k8s-v1120-4.1.6
description	Ensure that the --kubeconfig kubelet.conf file ownership is set to root:root (Automated)
category	cis-k8s
version	1.12.0
author	cyberstrike-official
tags	["cis","kubernetes","worker-nodes","worker-node-config","file-permissions"]
cis_id	4.1.6
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 4.1.6

Description

Ensure that the kubelet.conf file ownership is set to root:root.

Rationale

The kubelet.conf file is the kubeconfig file for the node, and controls various parameters that set the behavior and identity of the worker node. 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: Set the kubelet config variable

Automated AAC auditing has been modified to allow CIS-CAT to input a variable for the <PATH>/<FILENAME> of the kubelet config file.

Please set $kubelet_config=<PATH> based on the file location on your system.

For example:

export kubelet_config=/etc/kubernetes/kubelet.conf

Step 2: Verify file ownership

To perform the audit manually: Run the below command (based on the file location on your system) on the each worker node. For example,

stat -c %U:%G /etc/kubernetes/kubelet.conf

Verify that the ownership is set to root:root.

Remediation

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

chown root:root /etc/kubernetes/kubelet.conf

Default Value

By default, kubelet.conf file ownership is set to root:root.

References

1. https://kubernetes.io/docs/admin/kubelet/

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