The --client-ca-file argument for API Servers is not set appropriately misconfiguration detected in

Rule Details

Cortex AppSec Rule ID	APPSEC_K8S_140
Category - Subcategory	Kubernetes - Native Security Controls
Provider	OTHER
Severity	LOW
Framework	Helm, Kubernetes, Kustomize

Impact

Enable Kubelet authentication using certificates. The connections from the apiserver to the kubelet are used for fetching logs for pods, attaching (through kubectl) to running pods, and using the kubelet's port-forwarding functionality. These connections terminate at the kubelet's HTTPS endpoint. By default, the apiserver does not verify the kubelet's serving certificate, which makes the connection subject to man-in-the-middle attacks, and unsafe to run over untrusted and/or public networks. Enabling Kubelet certificate authentication ensures that the apiserver could authenticate the Kubelet before submitting any requests.

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
• • --root-ca-file=test.pem image: gcr.io/google_containers/kubelet-amd64:v1.6.0 ...", }

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