yaml.docker-compose.security.exposing-docker-socket-volume.exposing-docker-socket-volume

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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 volumes to prevent this.

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Defintion

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rules:
  - id: exposing-docker-socket-volume
    patterns:
      - pattern-inside: |
          version: ...
          ...
      - pattern-either:
          - pattern: |
              volumes:
                - ...
                - /var/run/docker.sock:/var/run/docker.sock
                - ...
          - pattern: |
              volumes:
                - ...
                - /run/docker.sock:/run/docker.sock
                - ...
          - pattern: |
              volumes:
                - ...
                - /var/run/docker.sock:/run/docker.sock
                - ...
          - pattern: |
              volumes:
                - ...
                - /run/docker.sock:/var/run/docker.sock
                - ...
          - pattern: |
              volumes:
                - ...
                - /var/run/docker.sock
                - ...
          - pattern: |
              volumes:
                - ...
                - /run/docker.sock
                - ...
          - pattern: |
              volumes:
                - ...
                - ...
                  source: /var/run/docker.sock
                  ...
                - ...
          - pattern: |
              volumes:
                - ...
                - ...
                  source: /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 volumes
      to prevent this.
    metadata:
      references:
        - https://docs.docker.com/compose/compose-file/compose-file-v3/#volume-configuration-reference
        - 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:
        - docker-compose
      cwe:
        - "CWE-250: Execution with Unnecessary Privileges"
      owasp:
        - A06:2017 - Security Misconfiguration
        - A05:2021 - Security Misconfiguration
      subcategory:
        - audit
      likelihood: LOW
      impact: HIGH
      confidence: LOW
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
    languages:
      - yaml
    severity: WARNING

Examples

exposing-docker-socket-volume.test.yaml

version: "3.9"
services:
  service01:
    image: nginx:alpine
    # ok: exposing-docker-socket-volume
    volumes:
      - /tmp/foo:/tmp/foo
      - /tmp/bar:/tmp/bar
  service02:
    image: my-worker-image:latest
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /tmp/foo:/tmp/foo
      - /var/run/docker.sock:/var/run/docker.sock
  service03:
    image: mysql
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - /tmp/foo:/tmp/foo
  service04:
    image: redis
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /tmp/foo:/tmp/foo
      - /var/run/docker.sock:/var/run/docker.sock
      - /tmp/bar:/tmp/bar
  service05:
    image: ubuntu
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /tmp/foo:/tmp/foo
      - /run/docker.sock:/run/docker.sock
  service06:
    image: debian:bullseye
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /run/docker.sock:/run/docker.sock
      - /tmp/foo:/tmp/foo
  service07:
    image: debian:buster
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /tmp/foo:/tmp/foo
      - /run/docker.sock:/run/docker.sock
      - /tmp/bar:/tmp/bar
  service08:
    image: python:3.10
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /tmp/foo:/tmp/foo
      - /var/run/docker.sock:/run/docker.sock
  service09:
    image: python:3.9
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /var/run/docker.sock:/run/docker.sock
      - /tmp/foo:/tmp/foo
  service10:
    image: ruby:3
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /tmp/foo:/tmp/foo
      - /var/run/docker.sock:/run/docker.sock
      - /tmp/bar:/tmp/bar
  service11:
    image: postgres:14
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /tmp/foo:/tmp/foo
      - /run/docker.sock:/var/run/docker.sock
  service12:
    image: random:thing
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /run/docker.sock:/var/run/docker.sock
      - /tmp/foo:/tmp/foo
  service13:
    image: semgrep:latest
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /tmp/foo:/tmp/foo
      - /run/docker.sock:/var/run/docker.sock
      - /tmp/bar:/tmp/bar
  service14:
    image: redis:6
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /var/run/docker.sock
  service15:
    image: mysql:5.7
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /tmp/foo
      - /var/run/docker.sock
  service16:
    image: mysql:5.6
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /var/run/docker.sock
      - /tmp/foo
  service17:
    image: postgres:13
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /tmp/foo
      - /var/run/docker.sock
      - /tmp/bar
  service18:
    image: redis:6
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /run/docker.sock
  service19:
    image: mysql:5.7
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /tmp/foo
      - /run/docker.sock
  service20:
    image: mysql:5.6
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /run/docker.sock
      - /tmp/foo
  service21:
    image: postgres:13
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /tmp/foo
      - /run/docker.sock
      - /tmp/bar
  service22:
    image: debian:bullseye
    # ruleid: exposing-docker-socket-volume
    volumes:
      - source: /var/run/docker.sock
  service23:
    image: debian:buster
    # ruleid: exposing-docker-socket-volume
    volumes:
      - source: /var/run/docker.sock
        target: /var/run/docker.sock
  service24:
    image: debian:bullseye-slim
    # ruleid: exposing-docker-socket-volume
    volumes:
      - target: /run/docker.sock
        source: /var/run/docker.sock
  service25:
    image: debian:buster-slim
    # ruleid: exposing-docker-socket-volume
    volumes:
      - source: /run/docker.sock
  service26:
    image: debian:bullseye
    # ruleid: exposing-docker-socket-volume
    volumes:
      - source: /run/docker.sock
        target: /run/docker.sock
  service27:
    image: debian:buster
    # ruleid: exposing-docker-socket-volume
    volumes:
      - target: /var/run/docker.sock
        source: /run/docker.sock
  service28:
    image: mysql:latest
    # ok: exposing-docker-socket-volume
    volumes:
      - source: /tmp/foo
  service29:
    image: postgres:latest
    # ok: exposing-docker-socket-volume
    volumes:
      - source: /tmp/foo
        target: /tmp/bar
      - source: /tmp/bar
        target: /tmp/foo
  service30:
    image: nginx
    # ruleid: exposing-docker-socket-volume
    volumes:
      - source: /tmp/foo
      - source: /var/run/docker.sock
  service31:
    image: nginx:alpine
    # ruleid: exposing-docker-socket-volume
    volumes:
      - source: /var/run/docker.sock
      - source: /tmp/foo
  service32:
    image: redis:alpine
    # ruleid: exposing-docker-socket-volume
    volumes:
      - source: /tmp/foo
      - source: /var/run/docker.sock
      - source: /tmp/bar
  service33:
    image: nginx
    # ruleid: exposing-docker-socket-volume
    volumes:
      - source: /tmp/foo
      - source: /run/docker.sock
  service34:
    image: nginx:alpine
    # ruleid: exposing-docker-socket-volume
    volumes:
      - source: /run/docker.sock
      - source: /tmp/foo
  service35:
    image: redis:alpine
    # ruleid: exposing-docker-socket-volume
    volumes:
      - source: /tmp/foo
      - source: /run/docker.sock
      - source: /tmp/bar
  service36:
    image: nginx:latest
    # ruleid: exposing-docker-socket-volume
    volumes:
      - source: /tmp/foo
      - /var/run/docker.sock
  service37:
    image: alpine:latest
    # ruleid: exposing-docker-socket-volume
    volumes:
      - source: /run/docker.sock
      - /tmp/foo
  service38:
    image: redis:alpine
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /tmp/foo
      - source: /var/run/docker.sock
      - /tmp/bar
  service39:
    image: mysql:latest
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /var/run/docker.sock
  service40:
    image: postgres:latest
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
  service41:
    image: mysql:latest
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /run/docker.sock
  service42:
    image: postgres:latest
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /run/docker.sock:/run/docker.sock
  service43:
    image: mysql:latest
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /var/run/docker.sock:/run/docker.sock
  service44:
    image: postgres:latest
    # ruleid: exposing-docker-socket-volume
    volumes:
      - /var/run/docker.sock:/run/docker.sock