CVE-2025-5426

Executive Summary

CVE-2025-5426 is a critical Improper Access Control vulnerability discovered in the Juzaweb CMS, affecting versions up to and including 3.4.2. The vulnerability resides in the /admin-cp/menus endpoint of the Menu Page component, allowing an authenticated attacker with low privileges to manipulate menu entries without proper authorization checks. This flaw can lead to unauthorized modification of the CMS navigation structure, potentially enabling privilege escalation, data exfiltration, or defacement. The vendor was contacted but did not respond, and no official patch is available at this time. The exploit has been publicly disclosed, increasing the risk of active exploitation.

Supply Chain & Package Security

Juzaweb is a PHP-based CMS distributed via Composer. The vulnerability affects the core application, not a third-party package. However, organizations using Juzaweb should audit their Composer dependencies for any custom or forked versions that may have introduced additional access control flaws. The lack of vendor response raises concerns about the long-term security of the supply chain for this project.

CVSS Breakdown & Threat Level

CVSS Score: 0.0 (NVD) | Adjusted Score: 8.1 (High)

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Threat Level: High. The combination of low privileges required, public exploit availability, and no patch makes this a significant risk for all Juzaweb deployments.

Deep Dive & Mechanics

The vulnerability is a classic case of Improper Access Control (CWE-284) . The /admin-cp/menus endpoint lacks server-side authorization checks for certain actions (e.g., creating, editing, deleting menu items). While the UI may hide these actions from low-privilege users, the underlying API does not validate the user's role before processing requests.

Root Cause: The MenuController (or equivalent) likely uses a function like authorize('manage-menus') only for the main menu listing page, but not for individual CRUD operations. An attacker can directly send POST/PUT/DELETE requests to endpoints such as:

• /admin-cp/menus/create
• /admin-cp/menus/{id}/edit
• /admin-cp/menus/{id}/delete

Attack Flow:

1. Attacker logs in with a low-privilege account (e.g., "Editor").
2. Attacker intercepts a legitimate request to /admin-cp/menus and observes the API structure.
3. Attacker crafts a POST request to /admin-cp/menus/create with a payload containing a malicious link (e.g., pointing to a phishing site).
4. The server processes the request without checking if the user has the manage-menus permission.
5. The malicious menu item appears for all users, including administrators.

Impact:

• Privilege Escalation: An attacker could create a menu item that links to a sensitive admin page (e.g., user management) that they otherwise cannot access directly.
• Phishing: Menu items can be renamed to mimic legitimate links, redirecting users to attacker-controlled sites.
• Defacement: The entire navigation structure can be corrupted, causing denial of service for legitimate users.

Vulnerable vs. Patched Code

Since no official patch exists, the following is a hypothetical fix based on common access control patterns.

Vulnerable Code (PHP/Laravel-style):

// MenuController.php
public function store(Request $request)
{
    // Missing authorization check
    $menu = Menu::create($request->all());
    return redirect()->route('menus.index');
}

Patched Code (Hypothetical):

// MenuController.php
public function store(Request $request)
{
    $this->authorize('manage-menus'); // Added authorization gate
    $menu = Menu::create($request->all());
    return redirect()->route('menus.index');
}

Key Difference: The patched version explicitly checks the manage-menus permission before allowing any modification. Without this check, any authenticated user can perform the action.

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• A running instance of Juzaweb <= 3.4.2
• A low-privilege user account (e.g., editor:password)

Exploit Steps:

1. Authenticate and obtain a session cookie.
2. Create a malicious menu item by sending a POST request to /admin-cp/menus with the following payload:

curl -X POST http://target.com/admin-cp/menus \
  -H "Cookie: laravel_session=your_session_cookie" \
  -H "X-CSRF-TOKEN: your_csrf_token" \
  -d "name=Malicious Link&url=http://evil.com&parent_id=0&sort_order=1"

3. Verify the menu item appears by visiting the frontend.

Advanced Exploitation:

• Use a CSRF token grabber to automate the process.
• Chain with XSS if the menu name field is not sanitized (though not confirmed for this CVE).

Blue Team (Defensive)

Detection:

• Monitor for unusual POST/PUT/DELETE requests to /admin-cp/menus from low-privilege users.
• Alert on creation of menu items containing external URLs or suspicious keywords.

Hunting:

• Query database for menu items with url fields pointing to external domains.
• Review audit logs for MenuController@store or MenuController@update actions by non-admin users.

Mitigation (Temporary):

• Implement a custom middleware that checks user roles before allowing menu modifications.
• Disable the menu management feature for non-admin users via .env configuration or a plugin.

Indicators of Compromise (IOCs)

Detection Engineering

YARA Rule

rule CVE_2025_5426_Juzaweb_Menu_Access_Control {
    meta:
        description = "Detects exploitation attempts of CVE-2025-5426 in Juzaweb CMS"
        author = "Valters IT"
        date = "2025-04-10"
        hash = "d41d8cd98f00b204e9800998ecf8427e"
    strings:
        $s1 = "/admin-cp/menus" ascii wide nocase
        $s2 = "POST" ascii wide nocase
        $s3 = "name=" ascii wide nocase
        $s4 = "url=" ascii wide nocase
    condition:
        all of ($s1, $s2) and any of ($s3, $s4)
}

Sigma Rule

title: CVE-2025-5426 - Juzaweb Menu Access Control Bypass
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects unauthorized menu modification attempts in Juzaweb CMS
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
    service: access_combined
detection:
    selection:
        cs-method: 'POST'
        cs-uri-stem: '/admin-cp/menus'
    condition: selection
falsepositives:
    - Legitimate admin actions (should be rare)
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2025-5426 - Juzaweb Menu Access Control Bypass Attempt";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/admin-cp/menus"; http_uri;
    content:"name="; http_client_body;
    content:"url="; http_client_body;
    sid:1000001;
    rev:1;
    priority:1;
    reference:cve,2025-5426;
    classtype:attempted-admin;
)

Remediation & Mitigation

Immediate Actions:

1. Disable Menu Management for Non-Admin Users: Modify the app/Http/Controllers/Admin/MenuController.php to add an authorization gate at the top of each method:

   $this->authorize('manage-menus');
   

2. Implement a Custom Middleware: Create a middleware that checks user roles before allowing any menu-related operations.
3. Monitor Logs: Enable detailed logging for all admin panel actions and review for anomalies.

Long-Term Fix:

• Since the vendor is unresponsive, consider forking the repository and applying the patch yourself.
• Migrate to a more actively maintained CMS if possible.

Workaround:

• Use a Web Application Firewall (WAF) to block requests to /admin-cp/menus from non-admin IP ranges.
• Restrict access to the admin panel via VPN or IP whitelisting.

Valters IT
Securing Digital Frontiers