NET_RAW Capabilities Not Being Dropped

• Query id: dbbc6705-d541-43b0-b166-dd4be8208b54
• Query name: NET_RAW Capabilities Not Being Dropped
• Platform: Kubernetes
• Severity: Medium
• Category: Insecure Configurations
• URL: Github

Description

Containers should drop 'ALL' or at least 'NET_RAW' capabilities
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - yaml file

apiVersion: v1
kind: Pod
metadata:
  name: example
spec:
  containers:
      - name: payment
        image: nginx
        securityContext:
          capabilities:
            drop:
              - SYS_ADMIN
      - name: payment2
        image: nginx
      - name: payment4
        image: nginx
        securityContext:
          capabilities:
            add:
              - NET_BIND_SERVICE
      - name: payment3
        image: nginx
        securityContext:
          allowPrivilegeEscalation: false

Positive test num. 2 - yaml file

apiVersion: apps/v1
kind: Deployment
metadata:
  name: redis-unhealthy-deployment
  labels:
    app: redis
spec:
  replicas: 3
  selector:
    matchLabels:
      app: redis
  template:
    metadata:      
      labels:
        app: redis
    spec:
      hostNetwork: true
      hostPID: true 
      hostIPC: true
      containers:
      - name: redis
        image: redis:latest
        ports:
        - containerPort: 9001
          hostPort: 9001
        securityContext:
          privileged: true
          readOnlyRootFilesystem: false
          allowPrivilegeEscalation: true
          runAsUser: 0
          capabilities:
            add:
              - NET_ADMIN

Code samples without security vulnerabilities

Negative test num. 1 - yaml file

apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
  name: example
spec:
  containers:
      - name: payment
        image: nginx
        securityContext:
          capabilities:
            drop:
              - ALL
            add:
              - NET_BIND_SERVICE
  privileged: false
  seLinux:
    rule: RunAsAny
  supplementalGroups:
    rule: RunAsAny
  runAsUser:
    rule: RunAsAny
  fsGroup:
    rule: RunAsAny
  volumes:
  - '*'