id: CVE-2019-12583

info:
  name: Zyxel ZyWall UAG/USG - Account Creation Access
  author: n-thumann
  severity: critical
  description: Zyxel UAG, USG, and ZyWall devices allows a remote attacker to generate guest accounts by directly accessing the account generator via the "Free Time" component. This can lead to unauthorized network access or DoS attacks.
  reference:
    - https://www.zyxel.com/support/vulnerabilities-related-to-the-Free-Time-feature.shtml
    - https://n-thumann.de/blog/zyxel-gateways-missing-access-control-in-account-generator-xss/
    - https://nvd.nist.gov/vuln/detail/CVE-2019-12583
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
    cvss-score: 9.1
    cve-id: CVE-2019-12583
    cwe-id: CWE-425
  tags: cve,cve2019,zyxel,zywall


requests:
  - method: GET
    path:
      - "{{BaseURL}}"
      - "{{BaseURL}}/free_time.cgi"

    req-condition: true
    matchers-condition: and
    matchers:
      - type: dsl
        dsl:
          - "contains(body_1, 'zyFunction.js')"
          - "!contains(body_1, '/free_time_transaction.cgi')"
          - "!contains(body_2, '/free_time_failed.cgi?err_msg=The Free Time feature is disabled at this time.')"
        condition: and

      - type: status
        status:
          - 200

# Enhanced by mp on 2022/06/01