The API server should not allow anonymous requests to Kubelet

kubernetes

Classification:

compliance

Framework:

cis-kubernetes

Control:

4.2.1

Set up the kubernetes integration.

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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.

Remediation

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:

--anonymous-auth=false

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

  1. https://kubernetes.io/docs/admin/kubelet/
  2. 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