The --root-ca-file argument for controller managers is not set appropriately misconfiguration detect

Rule Details

Cortex AppSec Rule ID	APPSEC_K8S_111
Category - Subcategory	Kubernetes - Native Security Controls
Provider	OTHER
Severity	HIGH
Framework	Helm, Kubernetes, Kustomize

Impact

Allow pods to verify the API server's serving certificate before establishing connections. Processes running within pods that need to contact the API server must verify the API server's serving certificate. Failing to do so could be a subject to man-in-the-middle attacks. Providing the root certificate for the API server's serving certificate to the controller manager with the --root-ca-file argument allows the controller manager to inject the trusted bundle into pods so that they can verify TLS connections to the API server.

How to Fix

Kind: Pod [source,go]

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

• command:
• kube-controller-manager
• • --root-ca-file=private.pem image: gcr.io/google_containers/kube-controller-manager-amd64:v1.6.0", }

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