CVE-2025-4923
📋 TL;DR
This critical vulnerability in SourceCodester Client Database Management System 1.0 allows remote attackers to upload arbitrary files via the /user_delivery_update.php endpoint. The unrestricted file upload can lead to remote code execution, affecting all users running this software.
💻 Affected Systems
- SourceCodester Client Database Management System
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, and potential lateral movement within the network.
Likely Case
Webshell deployment allowing persistent backdoor access, data exfiltration, and further exploitation of the server.
If Mitigated
Limited impact if file uploads are restricted to specific directories with proper permissions and execution disabled.
🎯 Exploit Status
Exploit code is publicly available on GitHub, making this easily weaponizable.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.sourcecodester.com/
Restart Required: No
Instructions:
No official patch available. Consider removing the software or implementing workarounds.
🔧 Temporary Workarounds
Restrict File Uploads
allImplement strict file type validation and limit uploads to specific extensions.
# Modify /user_delivery_update.php to validate file extensions and MIME types
Disable PHP Execution in Upload Directory
linuxPrevent uploaded files from being executed as PHP scripts.
# Add to .htaccess in upload directory: php_flag engine off
# Or use: RemoveHandler .php .phtml .php3 .php4 .php5 .php7
🧯 If You Can't Patch
- Remove or block access to /user_delivery_update.php endpoint
- Implement web application firewall rules to block file uploads to vulnerable endpoint
🔍 How to Verify
Check if Vulnerable:
Check if /user_delivery_update.php exists and accepts file uploads without proper validation.Check Version:
# Check version in application files or database configurationVerify Fix Applied:
Test file upload functionality with malicious extensions to ensure proper validation.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to /user_delivery_update.php
- PHP file execution from upload directories
Network Indicators:
- POST requests to /user_delivery_update.php with file uploads
- Subsequent connections to uploaded files
SIEM Query:
source="web_logs" AND uri="/user_delivery_update.php" AND method="POST" AND file_upload="true"