The Kubernetes KubeletConfiguration files must have file permissions set to 644 or more restrictive.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-242407	CNTR-K8-000890	SV-242407r918171_rule		Medium

Description
The kubelet configuration file contains the runtime configuration of the kubelet service. If an attacker can gain access to this file, changes can be made to open vulnerabilities and bypass user authorizations inherit within Kubernetes with RBAC implemented.

STIG	Date
Kubernetes Security Technical Implementation Guide	2023-08-29

Details

Check Text ( C-45682r918169_chk )
On the Kubernetes Control Plane and Worker nodes, run the command: ps -ef \| grep kubelet Check the config file (path identified by: --config): Change to the directory identified by --config (example /etc/sysconfig/) and run the command: ls -l kubelet Each KubeletConfiguration file must have permissions of "644" or more restrictive. If any KubeletConfiguration file is less restrictive than "644", this is a finding.

Check Text ( C-45682r918169_chk )

On the Kubernetes Control Plane and Worker nodes, run the command:
ps -ef | grep kubelet

Check the config file (path identified by: --config):

Change to the directory identified by --config (example /etc/sysconfig/) and run the command:
ls -l kubelet

Each KubeletConfiguration file must have permissions of "644" or more restrictive.

If any KubeletConfiguration file is less restrictive than "644", this is a finding.

Fix Text (F-45640r918170_fix)
On the Kubernetes Control Plane and Worker nodes, run the command: ps -ef \| grep kubelet Check the config file (path identified by: --config): Change to the directory identified by --config (example /etc/sysconfig/) and run the command: chmod 644 kubelet To verify the change took place, run the command: ls -l kubelet The kubelet file should now have the permissions of "644".