rw-shadow: /etc/shadow writable or readabel - Privilege Escalation

id: rw-shadow

info:
  name: /etc/shadow writable or readabel - Privilege Escalation
  author: daffainfo
  severity: high
  reference:
    - https://book.hacktricks.wiki/en/linux-hardening/privilege-escalation/index.html#passwdshadow-files
    - https://man7.org/linux/man-pages/man5/shadow.5.html
  metadata:
    verified: true
    max-request: 2
  tags: code,linux,privesc,local

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
        whoami

  - engine:
      - sh
      - bash
    source: |
        [ -r "/etc/shadow" ] || [ -w "/etc/shadow" ] && echo "Either readable or writable" || echo "Not readable and not writable"

    matchers:
      - type: word
        part: code_1_response
        words:
          - "root"
        negative: true

      - type: word
        part: code_2_response
        words:
          - "Either readable or writable"

      - type: word
        part: code_2_response
        words:
          - "Not readable and not writable"
        negative: true
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