Fortinet FortiOS - Open Redirect/Cross-Site Scripting

mediumseverity

6.1CVSS score

5.9%likelihood of exploitation, next 30 days

93%of all CVEs are less likely

Readycheck to confirm it

FortiOS Web User Interface in 5.0.x before 5.0.13, 5.2.x before 5.2.3, and 5.4.x before 5.4.0 allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks or cross-site scripting attacks via the "redirect" parameter to "login."

Impact

Successful exploitation of this vulnerability could lead to unauthorized access, phishing attacks, and potential data theft.

Fix

Apply the latest security patches and updates provided by Fortinet to mitigate the vulnerability.

How to confirm it

Send: GET {{BaseURL}}/login?redir=http://www.interact.sh
Positive when: matches in header /(?m)^(?:Location\s*?:\s*?)(?:https?:\/\/|\/\/|\/\\\\|\/\\)(?:[a-zA-Z0-9\-_\.@]*…/

Run it with nuclei: nuclei -id CVE-2016-3978 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2016-3978

info:
  name: Fortinet FortiOS - Open Redirect/Cross-Site Scripting
  author: 0x_Akoko
  severity: medium
  description: FortiOS Web User Interface in 5.0.x before 5.0.13, 5.2.x before 5.2.3, and 5.4.x before 5.4.0 allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks or cross-site scripting attacks via the "redirect" parameter to "login."
  impact: |
    Successful exploitation of this vulnerability could lead to unauthorized access, phishing attacks, and potential data theft.
  remediation: |
    Apply the latest security patches and updates provided by Fortinet to mitigate the vulnerability.
  reference:
    - http://www.fortiguard.com/advisory/fortios-open-redirect-vulnerability
    - https://nvd.nist.gov/vuln/detail/CVE-2016-3978
    - http://seclists.org/fulldisclosure/2016/Mar/68
    - http://www.securitytracker.com/id/1035332
  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-2016-3978
    cwe-id: CWE-79
    epss-score: 0.05937
    epss-percentile: 0.93322
    cpe: cpe:2.3:o:fortinet:fortios:5.0.0:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: fortinet
    product: fortios
    shodan-query:
      - http.html:"/remote/login" "xxxxxxxx"
      - http.favicon.hash:945408572
      - cpe:"cpe:2.3:o:fortinet:fortios"
      - port:10443 http.favicon.hash:945408572
    fofa-query:
      - body="/remote/login" "xxxxxxxx"
      - icon_hash=945408572
  tags: cve2016,cve,redirect,fortinet,fortios,seclists,vuln

http:
  - method: GET
    path:
      - '{{BaseURL}}/login?redir=http://www.interact.sh'

    matchers:
      - type: regex
        part: header
        regex:
          - '(?m)^(?:Location\s*?:\s*?)(?:https?:\/\/|\/\/|\/\\\\|\/\\)(?:[a-zA-Z0-9\-_\.@]*)interact\.sh\/?(\/|[^.].*)?$' # https://regex101.com/r/L403F0/1

References

Use this check only on systems you are authorised to test. Where the data comes from