Secure port set to zero

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Metadata

Id: kubernetes-secure-port-set-to-zero

Platform: Kubernetes

Severity: High

Category: Networking and Firewall

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Description

When using kube-apiserver, the --secure-port flag should not be set to 0. Setting --secure-port=0 disables the API server’s secure (HTTPS) listener, which can prevent encrypted communication and potentially expose the server to insecure access. This rule inspects container command arguments in containers and initContainers for kube-apiserver and flags any occurrence of --secure-port=0.

Compliant Code Examples

apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
    - name: command-demo-container
      image: gcr.io/google_containers/kube-apiserver-amd64:v1.6.0
      command: ["kube-apiserver"]
      args: []
  restartPolicy: OnFailure

apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
    - name: command-demo-container
      image: gcr.io/google_containers/kube-apiserver-amd64:v1.6.0
      command: ["kube-apiserver","--secure-port=6443"]
      args: []
  restartPolicy: OnFailure

Non-Compliant Code Examples

apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
    - name: command-demo-container
      image: gcr.io/google_containers/kube-apiserver-amd64:v1.6.0
      command: ["kube-apiserver"]
      args: ["--secure-port=0"]
  restartPolicy: OnFailure