cis-eks-v160-3-1-4

name	cis-eks-v160-3.1.4
description	Ensure that the kubelet configuration file ownership is set to root:root (Automated)
category	cis-eks
version	1.6.0
author	cyberstrike-official
tags	["cis","eks","kubernetes","aws","worker-node","configuration-files","file-ownership","kubelet"]
cis_id	3.1.4
cis_benchmark	CIS Amazon Elastic Kubernetes Service (EKS) Benchmark v1.6.0
tech_stack	["kubernetes","aws","eks"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

3.1.4 Ensure that the kubelet configuration file ownership is set to root:root (Automated)

Profile Applicability

• Level 1

Description

Ensure that if the kubelet refers to a configuration file with the --config argument, that file is owned by root:root.

Rationale

The kubelet reads various parameters, including security settings, from a config file specified by the --config argument. If this file is specified you should restrict its file permissions to maintain the integrity of the file. The file should be writable by only the administrators on the system.

Audit Procedure

Method 1 - SSH to the relevant worker node:

To check to see if the Kubelet Service is running:

sudo systemctl status kubelet

The output should return Active: active (running) since...

Run the following command on each node to find the appropriate Kubelet config file:

ps -ef | grep kubelet

The output of the above command should return something similar to --config /etc/kubernetes/kubelet/config.json which is the location of the Kubelet config file.

Run the following command:

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

The output of the above command is the Kubelet config file's ownership. Verify that the ownership is set to root:root.

Method 2 - Create and Run a Privileged Pod:

You will need to run a pod that is privileged enough to access the host's file system. This can be achieved by deploying a pod that uses the hostPath volume to mount the node's file system into the pod.

apiVersion: v1
kind: Pod
metadata:
  name: file-check
spec:
  volumes:
    - name: host-root
      hostPath:
        path: /
         
  
      
       
       [, ]