An AKS Cluster's Kubelet should only allow explicitly authorized requests

azure.kubernetes
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Description

Kubelets can be configured to allow all authenticated requests (even anonymous ones) without needing explicit authorization checks from the apiserver. You should restrict this behavior and only allow explicitly authorized requests.

Remediation

Choose one of the following remediation methods. For both methods, a restart of the Kubelet service is required.

Kubelet config file

  1. Add the following JSON to the /etc/kubernetes/kubelet/kubelet-config.json file.
"authentication": { "webhook": { "enabled": true } }
"authorization": { "mode": "Webhook" }

Executable arguments

  1. Edit the kubelet service file on each worker node and ensure the following parameters are part of the KUBELET_ARGS variable string.
--authentication-token-webhook
--authorization-mode=Webhook