CVE-2024-57052

Executive Summary

CVE-2024-57052 is a privilege escalation vulnerability in YoudianCMS versions 9.5.20 and earlier. The issue resides in the index.php file, where the sessionID parameter is not properly validated. A remote, unauthenticated attacker can manipulate this parameter to hijack an active session or forge a session with elevated privileges, potentially gaining administrative access to the CMS backend.

This vulnerability is particularly dangerous because it requires no authentication and can be exploited over the network. The lack of a confirmed patch and the absence of public exploit code or detection signatures increase the risk for unmonitored instances. The EPSS score of 0.0% indicates low exploitation activity in the wild, but this may change as the vulnerability becomes more widely known.

Supply Chain & Package Security

YoudianCMS is a PHP-based content management system. The vulnerability is in the core application code, not in a third-party package. However, administrators should verify the integrity of their CMS installation and check for any unofficial patches or updates from the vendor.

CVSS Breakdown & Threat Level

The CVSS score is listed as 0.0, which is likely a placeholder. Based on the vulnerability description, a reasonable CVSS v3.1 vector would be:

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

• Attack Vector (AV): Network – The attacker can exploit this remotely.
• Attack Complexity (AC): Low – No special conditions are required.
• Privileges Required (PR): None – No authentication needed.
• User Interaction (UI): None – No user action is required.
• Scope (S): Unchanged – The vulnerable component and the impacted component are the same.
• Confidentiality (C): High – Full read access to the CMS database and files.
• Integrity (I): High – Full write access to the CMS.
• Availability (A): High – Potential to disrupt the CMS service.

Base Score: 9.8 (Critical)

Deep Dive & Mechanics

The vulnerability is in the session handling mechanism of YoudianCMS. The index.php file likely uses the sessionID parameter from the request (GET or POST) to identify the user's session. If the application does not properly validate that the session ID belongs to the current user or that the session has the correct privileges, an attacker can:

1. Session Fixation: Force a known session ID onto a victim and then use that session after the victim logs in.
2. Session Hijacking: Steal a valid session ID (e.g., via XSS or network sniffing) and use it to impersonate the victim.
3. Direct Session Manipulation: Craft a session ID that corresponds to an administrative session (e.g., by guessing or brute-forcing).

The core issue is a lack of proper session validation and insufficient entropy in session ID generation. The application does not verify that the session ID provided by the client matches the session stored on the server for that user.

Vulnerable vs. Patched Code

Since no patch is available, we can only analyze the vulnerable code pattern. The vulnerable code in index.php likely looks like this:

// Vulnerable code
session_id($_GET['sessionID']);
session_start();
// ... rest of the application

The patched version should validate the session ID against the current user's session:

// Patched code
$provided_session_id = $_GET['sessionID'] ?? '';
if (session_id() !== $provided_session_id) {
    // Reject the request or regenerate the session
    session_regenerate_id(true);
    // Log the attempt
    error_log('Session ID mismatch detected from IP: ' . $_SERVER['REMOTE_ADDR']);
    die('Invalid session.');
}
session_start();
// ... rest of the application

Exploitation & Lab Setup

Red Team

Lab Setup:

1. Install YoudianCMS v9.5.20 on a local server (e.g., XAMPP, LAMP).
2. Create an administrative user and log in to capture a valid session ID.
3. Use a tool like Burp Suite or a simple Python script to manipulate the session.

Exploitation Steps:

1. Identify a valid session ID (e.g., by sniffing traffic or using a known pattern).
2. Send a request to index.php with the sessionID parameter set to the administrative session ID.
3. The application will treat the attacker as the administrator.

Example Request:

GET /index.php?sessionID=admin_session_id_here HTTP/1.1
Host: target-youdiancms.com

Python Exploit Script:

import requests

target = "http://target-youdiancms.com/index.php"
admin_session_id = "known_admin_session_id"

cookies = {"PHPSESSID": admin_session_id}
response = requests.get(target, cookies=cookies)

if "admin_panel" in response.text:
    print("[+] Privilege escalation successful!")
else:
    print("[-] Exploit failed.")

Blue Team

Detection:

• Monitor for multiple requests with different sessionID values from the same IP.
• Alert on session IDs that do not match the expected format or length.
• Log all session ID changes and correlate with user actions.

Hunting:

• Search logs for sessionID parameter in GET/POST requests.
• Look for session IDs that are reused across different user agents or IPs.
• Identify sessions that suddenly gain administrative privileges without a corresponding login event.

Indicators of Compromise (IOCs)

• Network: HTTP requests to index.php with a sessionID parameter.
• Logs: Session ID mismatch errors in PHP error logs.
• Session: Multiple sessions with the same ID from different IPs.
• File: Unauthorized changes to CMS configuration or user roles.

Example IOC Log Entry:

[2025-01-01 12:00:00] PHP Notice:  session_id(): Cannot change session id when session is active in /var/www/html/index.php on line 10

Detection Engineering

YARA Rule

rule Detect_YoudianCMS_SessionID_Exploit {
    meta:
        description = "Detects attempts to exploit CVE-2024-57052 by manipulating sessionID parameter"
        author = "Valters IT"
        date = "2025-01-01"
        reference = "CVE-2024-57052"
    strings:
        $session_param = "sessionID=" nocase
        $index_php = "index.php" nocase
    condition:
        $session_param and $index_php
}

Sigma Rule

title: YoudianCMS SessionID Manipulation
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects HTTP requests with sessionID parameter to index.php
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2024-57052
author: Valters IT
date: 2025-01-01
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'GET'
        cs-uri-query|contains: 'sessionID='
        cs-uri-stem|endswith: '/index.php'
    condition: selection
falsepositives:
    - Legitimate session management
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-57052 YoudianCMS SessionID Manipulation"; flow:to_server; content:"GET"; http_method; content:"/index.php"; http_uri; content:"sessionID="; http_uri; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable Remote Access: If possible, restrict access to the CMS admin panel to trusted IPs only.
2. Web Application Firewall (WAF): Deploy a WAF rule to block requests containing sessionID parameter in the URL.
3. Session Hardening: Manually patch the index.php file to validate session IDs as shown in the patched code example.

Long-Term Fix:

• Monitor the vendor's website for an official patch.
• Consider migrating to a more actively maintained CMS.
• Implement strong session management practices:
  • Use HTTPS only.
  • Regenerate session IDs after login.
  • Set short session timeouts.
  • Use secure, random session IDs.

Valters IT Signature

This report was generated by Valters IT Cyber Threat Intelligence Division.