yaml.kubernetes.security.exposing-docker-socket-hostpath.exposing-docker-socket-hostpath

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Exposing host's Docker socket to containers via a volume. The owner of this socket is root. Giving someone access to it is equivalent to giving unrestricted root access to your host. Remove 'docker.sock' from hostpath to prevent this.

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Defintion

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rules:
  - id: exposing-docker-socket-hostpath
    patterns:
      - pattern-inside: |
          volumes:
            ...
      - pattern: |
          hostPath:
            ...
            path: /var/run/docker.sock
    message: Exposing host's Docker socket to containers via a volume. The owner of
      this socket is root. Giving someone access to it is equivalent to giving
      unrestricted root access to your host. Remove 'docker.sock' from hostpath
      to prevent this.
    metadata:
      cwe:
        - "CWE-250: Execution with Unnecessary Privileges"
      references:
        - https://kubernetes.io/docs/concepts/storage/volumes/#hostpath
        - https://kubernetes.io/docs/concepts/policy/pod-security-policy/#volumes-and-file-systems
        - https://kubernetes.io/docs/tasks/configure-pod-container/security-context/
        - https://cheatsheetseries.owasp.org/cheatsheets/Docker_Security_Cheat_Sheet.html#rule-1-do-not-expose-the-docker-daemon-socket-even-to-the-containers
      category: security
      technology:
        - kubernetes
      subcategory:
        - vuln
      likelihood: LOW
      impact: HIGH
      confidence: MEDIUM
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
    languages:
      - yaml
    severity: WARNING

Examples

exposing-docker-socket-hostpath.test.yaml

apiVersion: v1
kind: Pod
metadata:
  name: test-pd
spec:
  containers:
    - image: gcr.io/google_containers/test-webserver
      name: test-container
      volumeMounts:
        - mountPath: /var/run/docker.sock
          name: docker-sock-volume
  volumes:
    - name: docker-sock-volume
      # ruleid: exposing-docker-socket-hostpath
      hostPath:
        type: File
        path: /var/run/docker.sock