Title

The Kubernetes KubeletConfiguration files must have file permissions set to 644 or more restrictive. (Cat II impact)

Discussion

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.

Check Content

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

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".

Additional Identifiers

Rule ID: SV-242407r918171_rule

Vulnerability ID: V-242407

Group Title: SRG-APP-000133-CTR-000305

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.