Etcd TLS Certificate Not Properly Configured

• Query id: 895a5a95-3756-4b04-9924-2f3bc93181bd
• Query name: Etcd TLS Certificate Not Properly Configured
• Platform: Kubernetes
• Severity: High
• Category: Networking and Firewall
• URL: Github

Description

When using kube-apiserver commands, the '--etcd-certfile' and '--etcd-keyfile' flags should be defined
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - yaml file

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: ["--etcd-keyfile=/path/to/key/file.key"]
  restartPolicy: OnFailure

Positive test num. 2 - yaml file

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: ["--etcd-certfile=/path/to/cert/file.crt"]
  restartPolicy: OnFailure

Code samples without security vulnerabilities

Negative test num. 1 - yaml file

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: ["--etcd-keyfile=/path/to/key/file.key","--etcd-certfile=/path/to/cert/file.crt"]
  restartPolicy: OnFailure

Negative test num. 2 - yaml file

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","--etcd-keyfile=/path/to/key/file.key","--etcd-certfile=/path/to/cert/file.crt"]
      args: []
  restartPolicy: OnFailure