The API server should not allow anonymous requests to Kubelet
Set up the kubernetes integration.
Description
Disable anonymous requests to the Kubelet server.
Rationale
When enabled, requests that are not rejected by other configured authentication methods are treated as anonymous requests. These requests are then served by the Kubelet server. You should rely on authentication to authorize access and disallow anonymous requests.
Audit
If using a Kubelet configuration file, check that there is an entry for authentication: anonymous: enabled set to false. Run the following command on each node: ps -ef | grep kubelet. Verify that the --anonymous-auth argument is set to false. This executable argument may be omitted, provided there is a corresponding entry set to false in the Kubelet config file.
If using a Kubelet config file, edit the file to set authentication: anonymous: enabled to false. If using executable arguments, edit the kubelet service file /etc/systemd/system/kubelet.service.d/10-kubeadm.conf on each worker node and set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable:
Based on your system, restart the kubelet service. For example: systemctl daemon-reload systemctl restart kubelet.service
Impact
Anonymous requests will be rejected.
Default value
By default, anonymous access is enabled.
References
- https://kubernetes.io/docs/admin/kubelet/
- https://kubernetes.io/docs/admin/kubelet-authentication-authorization/#kubelet-authentication
CIS controls
Version 6.14 Controlled Access Based on the Need to Know
Version 7.14 Controlled Access Based on the Need to Know
