CNTR-K8-000370 - The Kubernetes Kubelet must have anonymous authentication disabled.

Warning! Audit Deprecated

This audit has been deprecated and will be removed in a future update.

Information

A user who has access to the Kubelet essentially has root access to the nodes contained within the Kubernetes Control Plane. To control access, users must be authenticated and authorized. By allowing anonymous connections, the controls put in place to secure the Kubelet can be bypassed.

Setting anonymous authentication to 'false' also disables unauthenticated requests from kubelets.

While there are instances where anonymous connections may be needed (e.g., health checks) and Role-Based Access Controls (RBAC) are in place to limit the anonymous access, this access must be disabled and only enabled when necessary.

Solution

On each Control Plane and Worker Node, run the command:
ps -ef | grep kubelet

Remove the 'anonymous-auth' option if present.

Note the path to the config file (identified by --config).

Edit the config file:
Locate the 'authentication' section and the 'anonymous' subsection. Within the 'anonymous' subsection, set 'enabled' to 'false'.

Restart the kubelet service using the following command:
systemctl daemon-reload && systemctl restart kubelet

Item Details

Audit Name: DISA STIG Kubernetes v2r5

Plugin: Unix

Control ID: c4f7036d32963492a1bc64685627314e154ebabb9f1a32a0ca8bdded6e40e7ea

Detections

Analytics

CNTR-K8-000370 - The Kubernetes Kubelet must have anonymous authentication disabled.

Warning! Audit Deprecated

Information

Solution

See Also

Item Details