Title

The Kubernetes Kubelet certificate authority must be owned by root. (Cat II impact)

Discussion

The Kubernetes kube proxy kubeconfig contain the argument and setting for the Control Planes. These settings contain network rules for restricting network communication between pods, clusters, and networks. If these files can be changed, data traversing between the Kubernetes Control Panel components would be compromised. 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. Review the ownership of the Kubernetes client-ca-file by using the command: more kubelet --client-ca-file argument Note certificate location Review the ownership of the Kubernetes client-ca-file by using the command: stat -c %U:%G <location from --client-ca-file argument>| grep -v root:root If the command returns any non root:root file permissions, this is a finding.

Fix Text

Change the permissions of the Kube Proxy to "root" by executing the command: chown root:root <location from kubeconfig>.

Additional Identifiers

Rule ID: SV-242450r879887_rule

Vulnerability ID: V-242450

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.