Title

The Kubernetes conf files must be owned by root. (Cat II impact)

Discussion

The Kubernetes conf 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. Many of the security settings within the document are implemented through this file.

Check Content

Review the Kubernetes conf files by using the command: stat -c %U:%G /etc/kubernetes/admin.conf | grep -v root:root stat -c %U:%G /etc/kubernetes/scheduler.conf | grep -v root:root stat -c %U:%G /etc/kubernetes/controller-manager.conf | grep -v root:root If the command returns any non root:root file permissions, this is a finding.

Fix Text

Change the ownership of the conf files to root: root by executing the command: chown root:root /etc/kubernetes/admin.conf chown root:root /etc/kubernetes/scheduler.conf chown root:root /etc/kubernetes/controller-manager.conf

Additional Identifiers

Rule ID: SV-242446r961863_rule

Vulnerability ID: V-242446

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.