CVE-2024-6943
📋 TL;DR
This CVE describes a critical remote code execution vulnerability in ZhongBangKeJi CRMEB e-commerce platform. Attackers can exploit insecure deserialization in the downloadImage function to execute arbitrary code on affected systems. All users running CRMEB versions up to 5.4.0 are vulnerable to remote attacks.
💻 Affected Systems
- ZhongBangKeJi CRMEB
📦 What is this software?
Crmeb by Crmeb
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary code, steal sensitive data, install malware, or pivot to other systems in the network.
Likely Case
Remote code execution leading to data theft, website defacement, or deployment of cryptocurrency miners or ransomware.
If Mitigated
Attack blocked at network perimeter or application firewall; no impact if proper input validation and deserialization controls are implemented.
🎯 Exploit Status
Public exploit code available; remote exploitation without authentication; vendor unresponsive to disclosure.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Consider upgrading to latest version if available, or implement workarounds.
🔧 Temporary Workarounds
Disable vulnerable endpoint
allBlock or disable access to the CopyTaobaoServices.php file or downloadImage function
# Add to .htaccess for Apache:
<Files "CopyTaobaoServices.php">
Order allow,deny
Deny from all
</Files>
# Nginx configuration:
location ~* /app/services/product/product/CopyTaobaoServices\.php$ {
deny all;
return 403;
}
Implement input validation
allAdd strict input validation and sanitization for all parameters passed to downloadImage function
# Example PHP input validation:
if (!preg_match('/^[a-zA-Z0-9\-\._]+$/', $input)) {
die('Invalid input');
}
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block deserialization attacks
- Isolate affected systems from internet and restrict network access
🔍 How to Verify
Check if Vulnerable:
Check if file app/services/product/product/CopyTaobaoServices.php exists and contains downloadImage function with unserialize() callsCheck Version:
Check CRMEB version in system configuration files or admin panelVerify Fix Applied:
Verify CopyTaobaoServices.php file is removed, renamed, or properly secured; test with safe deserialization payloads📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to CopyTaobaoServices.php
- PHP unserialize() errors in logs
- Unexpected file uploads or system commands
Network Indicators:
- HTTP requests containing serialized PHP objects
- Traffic to CopyTaobaoServices.php endpoint
SIEM Query:
source="web_logs" AND (uri="*CopyTaobaoServices.php*" OR message="*unserialize*" OR message="*PHPGGC*")🔗 References
- https://gist.github.com/J1rrY-learn/e15a1926a3b5a2b8805a15cb95eff1d7
- https://vuldb.com/?ctiid.272065
- https://vuldb.com/?id.272065
- https://vuldb.com/?submit.374394
- https://gist.github.com/J1rrY-learn/e15a1926a3b5a2b8805a15cb95eff1d7
- https://vuldb.com/?ctiid.272065
- https://vuldb.com/?id.272065
- https://vuldb.com/?submit.374394
