Authorization Mode Set To Always Allow

  • Query id: f1f4d8da-1ac4-47d0-b1aa-91e69d33f7d5
  • Query name: Authorization Mode Set To Always Allow
  • Platform: Kubernetes
  • Severity: Medium
  • Category: Access Control
  • URL: Github

Description

When using the kubelet command, the authorization-mode flag should not have 'AlwaysAllow' mode
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:
        ["--anonymous-auth=false", "--authorization-mode=MyMode,AlwaysAllow"]
  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", "--authorization-mode=MyMode,AlwaysAllow"]
  restartPolicy: OnFailure
Positive test num. 3 - 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:
        ["--anonymous-auth=false", "--authorization-mode=MyMode,AlwaysAllow"]
  restartPolicy: OnFailure

Positive 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", "--authorization-mode=MyMode,AlwaysAllow"]
  restartPolicy: OnFailure
Positive test num. 5 - yaml file 
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: "192.168.0.8"
port: 20250
serializeImagePulls: false
readOnlyPort: 0
authentication:
  anonymous:
    enabled: false
authorization:
  mode: AlwaysAllow
Positive test num. 6 - json file 
{
    "kind": "KubeletConfiguration",
    "apiVersion": "kubelet.config.k8s.io/v1beta1",
    "address": "0.0.0.0",
    "authorization": {
      "mode": "AlwaysAllow"
    }
}

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: ["--authorization-mode=MyMode"]
  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", "--authorization-mode=MyMode"]
  restartPolicy: OnFailure
Negative test num. 3 - 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: ["--authorization-mode=MyMode"]
  restartPolicy: OnFailure

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", "--authorization-mode=MyMode"]
  restartPolicy: OnFailure
Negative test num. 5 - yaml file 
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: "192.168.0.8"
port: 20250
serializeImagePulls: false
readOnlyPort: 0
authentication:
  anonymous:
    enabled: false
authorization:
  mode: webhook
Negative test num. 6 - json file 
{
    "kind": "KubeletConfiguration",
    "apiVersion": "kubelet.config.k8s.io/v1beta1",
    "address": "0.0.0.0",
    "authorization": {
      "mode": "webhook"
    }
}