Rotate Kubelet Server Certificate Not Active

  • Query id: 1c621b8e-2c6a-44f5-bd6a-fb0fb7ba33e2
  • Query name: Rotate Kubelet Server Certificate Not Active
  • Platform: Kubernetes
  • Severity: Medium
  • Category: Secret Management
  • CWE: 295
  • URL: Github

Description

The RotateKubeletServerCertificate argument should be true
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - yaml file
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: "192.168.0.8"
port: 20250
serializeImagePulls: false
evictionHard:
    memory.available:  "200Mi"
featureGates:
    RotateKubeletServerCertificate: false
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: foo/bar
      command: ["kubelet"]
      args: ["--feature-gates=RotateKubeletServerCertificate=false"]
  restartPolicy: OnFailure
Positive test num. 3 - json file
{
    "kind": "KubeletConfiguration",
    "address": "192.168.0.8",
    "apiVersion": "kubelet.config.k8s.io/v1beta1",
    "evictionHard": {
        "memory.available": "200Mi"
    },
    "featureGates": {
        "RotateKubeletServerCertificate": false
    },
    "port": 20250,
    "serializeImagePulls": false
}

Positive test num. 4 - yaml file 
apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
    - name: command-demo-container7
      image: gcr.io/google_containers/kube-apiserver-amd64:v1.6.0
      command: ["kube-controller-manager"]
      args: ["--feature-gates=RotateKubeletServerCertificate=false"]
  restartPolicy: OnFailure

Code samples without security vulnerabilities

Negative test num. 1 - yaml file
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: "192.168.0.8"
port: 20250
serializeImagePulls: false
evictionHard:
    memory.available:  "200Mi"
featureGates:
    RotateKubeletServerCertificate: true
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: foo/bar
      command: ["kubelet"]
      args: ["--feature-gates=RotateKubeletServerCertificate=true"]
  restartPolicy: OnFailure
Negative test num. 3 - yaml file
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: "192.168.0.8"
port: 20250
serializeImagePulls: false
evictionHard:
    memory.available:  "200Mi"

Negative test num. 4 - yaml file 
apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
    - name: command-demo-container
      image: foo/bar
      command: ["kubelet"]
      args: [""]
  restartPolicy: OnFailure
Negative test num. 5 - json file 
{
    "kind": "KubeletConfiguration",
    "address": "192.168.0.8",
    "apiVersion": "kubelet.config.k8s.io/v1beta1",
    "evictionHard": {
        "memory.available": "200Mi"
    },
    "featureGates": {
        "RotateKubeletServerCertificate": true
    },
    "port": 20250,
    "serializeImagePulls": false
}
Negative test num. 6 - json file 
{
    "kind": "KubeletConfiguration",
    "address": "192.168.0.8",
    "apiVersion": "kubelet.config.k8s.io/v1beta1",
    "evictionHard": {
        "memory.available": "200Mi"
    },
    "port": 20250,
    "serializeImagePulls": false
}