Views:
Profile applicability: Level 1 - Worker Node
Ensure that if the kubelet refers to a configuration file with the --config argument, that file has permissions of 600 or more restrictive.
The kubelet reads various parameters, including security settings, from a config file specified by the --config argument. If this file is specified you should restrict its file permissions to maintain the integrity of the file. The file should be writable by only the administrators on the system.
Note
Note
By default, the /var/lib/kubelet/config.yaml file as set up by kubeadm has permissions of 600.

Audit

Automated AAC auditing has been modified to allow CIS-CAT to input a variable for the <PATH>/<FILENAME> of the kubelet config yaml file. Set $kubelet_config_yaml=<PATH> based on the file location on your system:
export kubelet_config_yaml=/var/lib/kubelet/config.yaml
To perform the audit manually, run the below command (based on the file location on your system) on the each worker node:
stat -c %a /var/lib/kubelet/config.yaml
Verify that the permissions are 600 or more restrictive.

Remediation

Run the following command (using the config file location identied in the Audit step): 
chmod 600 /var/lib/kubelet/config.yaml