Title

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

Discussion

The Kubernetes admin kubeconfig files contain the arguments and settings for the Control Plane services. These services are controller and scheduler. If these files can be changed, the scheduler will be implementing the changes immediately.

Check Content

Review the permissions of the Kubernetes config files by using the command: stat -c %a /etc/kubernetes/admin.conf stat -c %a /etc/kubernetes/scheduler.conf stat -c %a /etc/kubernetes/controller-manager.conf If any of the files are have permissions more permissive than "644", this is a finding.

Fix Text

Change the permissions of the conf files to "644" by executing the command: chmod 644 /etc/kubernetes/admin.conf chmod 644 /etc/kubernetes/scheduler.conf chmod 644 /etc/kubernetes/controller-manager.conf

Additional Identifiers

Rule ID: SV-242460r927262_rule

Vulnerability ID: V-242460

Group Title: SRG-APP-000516-CTR-001335

Expert Comments

CCIs tied to check.

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