4.1.10 - If the kubelet config.yaml configuration file is being used validate file ownership is set to root:root (Automated)

Views:

Profile applicability: Level 1 - Worker Node

Ensure that if the kubelet refers to a configuration file with the --config argument, that file is owned by root:root.

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 owned by root:root.

Note

By default, /var/lib/kubelet/config.yaml file as set up by kubeadm is owned by root:root.

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 %aU %G /var/lib/kubelet/config.yaml

Verify that the ownership is set to root:root.

Remediation

Run the following command (using the config file location identied in the Audit step):

chown root:root /etc/kubernetes/kubelet.conf