Title

The Kubernetes Kubelet certificate authority file must have file permissions set to 644 or more restrictive. (Cat II impact)

Discussion

The Kubernetes kubelet certificate authority file contains settings for the Kubernetes Node TLS certificate authority. Any request presenting a client certificate signed by one of the authorities in the client-ca-file is authenticated with an identity corresponding to the CommonName of the client certificate. If this file can be changed, the Kubernetes architecture could be compromised. The scheduler will implement the changes immediately. Many of the security settings within the document are implemented through this file.

Check Content

Change to the /etc/sysconfig/ directory on the Kubernetes Control Plane. Run command: more kubelet --client-ca-file argument Note certificate location If the ca-file argument location file has permissions more permissive than "644", this is a finding.

Fix Text

Change the permissions of the --client-ca-file to "644" by executing the command: chmod 644 <kubelet --client--ca-file argument location>.

Additional Identifiers

Rule ID: SV-242449r879887_rule

Vulnerability ID: V-242449

Group Title: SRG-APP-000516-CTR-001325

Expert Comments

CCIs tied to check.

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