Vulnerability Discussion

The manifest files contain the runtime configuration of the API server, scheduler, controller, and etcd. If an attacker can gain access to these files, changes can be made to open vulnerabilities and bypass user authorizations inherent within Kubernetes with RBAC implemented.

Satisfies: SRG-APP-000133-CTR-000310, SRG-APP-000133-CTR-000295, SRG-APP-000516-CTR-001335

Check

On both Control Plane and Worker Nodes, change to the /etc/kubernetes/manifest directory. Run the command:
ls -l *

Each manifest file must have permissions "644" or more restrictive.

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

Fix

On both Control Plane and Worker Nodes, change to the /etc/kubernetes/manifest directory. Run the command:
chmod 644 *

To verify the change took place, run the command:
ls -l *

All the manifest files should now have privileges of "644".