C-0238 - Ensure that the kubeconfig file permissions are set to 644 or more restrictive
Ensure that the kubeconfig file permissions are set to 644 or more restrictive
Note: to enable this control run Kubescape with host sensor (see here)
Description of the the issue
kubelet kubeconfig file controls various parameters of the
kubelet service in the worker node. 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.
It is possible to run
kubelet with the kubeconfig parameters configured as a Kubernetes ConfigMap instead of a file. In this case, there is no proxy kubeconfig file.
What does this control test
If kubelet is running, and if it is configured by a kubeconfig file, ensure that the proxy kubeconfig file has permissions of 644 or more restrictive.
How to check it manually
SSH to the worker nodes
To check to see if the Kubelet Service is running:
sudo systemctl status kubelet
The output should return
Active: active (running) since..
Run the following command on each node to find the appropriate kubeconfig file:
ps -ef | grep kubelet
The output of the above command should return something similar to
--kubeconfig /var/lib/kubelet/kubeconfig which is the location of the kubeconfig file.
Run this command to obtain the kubeconfig file permissions:
stat -c %a /var/lib/kubelet/kubeconfig
The output of the above command gives you the kubeconfig file's permissions.
Verify that if a file is specified and it exists, the permissions are
644 or more restrictive.
Run the below command (based on the file location on your system) on the each worker
node. For example,
chmod 644 <kubeconfig file>
See the AWS EKS documentation for the default value.
Updated about 1 month ago