Shared Host Network Namespace

• Query id: 6b6bdfb3-c3ae-44cb-88e4-7405c1ba2c8a
• Query name: Shared Host Network Namespace
• Platform: Kubernetes
• Severity: Medium
• Category: Resource Management
• CWE: 200
• URL: Github

Description

Container should not share the host network namespace
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - yaml file

apiVersion: v1
kind: Pod
metadata:
  name: security-context-demo
spec:
  hostNetwork: true
  securityContext:
    runAsUser: 1000
    runAsGroup: 3000
    fsGroup: 2000
  volumes:
    - name: sec-ctx-vol
      emptyDir: { }
  containers:
    - name: sec-ctx-demo
      image: busybox
      command: [ "sh", "-c", "sleep 1h" ]
      volumeMounts:
        - name: sec-ctx-vol
          mountPath: /data/demo
      securityContext:
        allowPrivilegeEscalation: false

Positive test num. 2 - yaml file

apiVersion: serving.knative.dev/v1
kind: Configuration
metadata:
  name: dummy-config
  namespace: knative-sequence
spec:
  template:
    spec:
      hostNetwork: true
      securityContext:
        runAsUser: 1000
        runAsGroup: 3000
        fsGroup: 2000
      volumes:
        - name: sec-ctx-vol
          emptyDir: { }
      containers:
        - name: sec-ctx-demo
          image: busybox
          command: [ "sh", "-c", "sleep 1h" ]
          volumeMounts:
            - name: sec-ctx-vol
              mountPath: /data/demo
          securityContext:
            allowPrivilegeEscalation: false

Code samples without security vulnerabilities

Negative test num. 1 - yaml file

apiVersion: v1
kind: Pod
metadata:
  name: security-context-demo
spec:
  securityContext:
    runAsUser: 1000
    runAsGroup: 3000
    fsGroup: 2000
  volumes:
    - name: sec-ctx-vol
      emptyDir: { }
  containers:
    - name: sec-ctx-demo
      image: busybox
      command: [ "sh", "-c", "sleep 1h" ]
      volumeMounts:
        - name: sec-ctx-vol
          mountPath: /data/demo
      securityContext:
        allowPrivilegeEscalation: false

Negative test num. 2 - yaml file

apiVersion: serving.knative.dev/v1
kind: Configuration
metadata:
  name: dummy-config
  namespace: knative-sequence
spec:
  template:
    spec:
      hostNetwork: false
      securityContext:
        runAsUser: 1000
        runAsGroup: 3000
        fsGroup: 2000
      volumes:
        - name: sec-ctx-vol
          emptyDir: { }
      containers:
        - name: sec-ctx-demo
          image: busybox
          command: [ "sh", "-c", "sleep 1h" ]
          volumeMounts:
            - name: sec-ctx-vol
              mountPath: /data/demo
          securityContext:
            allowPrivilegeEscalation: false