C-0183 - Verify that the RotateKubeletServerCertificate argument is set to true
Run Kubescape with host sensor (see here)
cis-v1.23-t1.0.1, cis-eks-t1.2.0, cis-aks-t1.2.0
Description of the the issue
RotateKubeletServerCertificate causes the kubelet to both request a serving certificate after bootstrapping its client credentials and rotate the certificate as its existing credentials expire. This automated periodic rotation ensures that the there are no downtimes due to expired certificates and thus addressing availability in the CIA security triad.
Note: This recommendation only applies if you let kubelets get their certificates from the API server. In case your kubelet certificates come from an outside authority/tool (e.g. Vault) then you need to take care of rotation yourself.
What does this control test
Enable kubelet server certificate rotation.
How to check it manually
Ignore this check if serverTLSBootstrap is true in the kubelet config file or if the --rotate-server-certificates parameter is set on kubelet
Run the following command on each node:
ps -ef | grep kubelet
RotateKubeletServerCertificate argument exists and is set to
Edit the kubelet service file
/etc/kubernetes/kubelet.conf on each worker node and set the below parameter in
Based on your system, restart the
kubelet service. For example:
systemctl daemon-reload systemctl restart kubelet.service
By default, kubelet server certificate rotation is enabled.
Updated 8 days ago