The RotateKubeletServerCertificate argument for controller managers is not set to True misconfigurat

Rule Details

Cortex AppSec Rule ID	APPSEC_K8S_112
Category - Subcategory	Kubernetes - Native Security Controls
Provider	OTHER
Severity	MEDIUM
Framework	Helm, Kubernetes, Kustomize

Impact

Enable kubelet server certificate rotation. 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.

How to Fix

Kind: Pod [source,go]

{ "apiVersion: v1 kind: Pod metadata: creationTimestamp: null labels: component: kubelet tier: control-plane name: kubelet namespace: kube-system spec: containers:

• command:
• • kubelet
• • --feature-gates=RotateKubeletServerCertificate=true image: gcr.io/google_containers/kubelet-amd64:v1.6.0", }

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