CVE-2025-46191: Client Database Management System RCE

CVE-2025-46191 Overview

CVE-2025-46191 is a critical arbitrary file upload vulnerability affecting the SourceCodester Client Database Management System version 1.0. The vulnerability exists in the user_payment_update.php script, which allows unauthenticated users to upload arbitrary files via the uploaded_file_cancelled field. Due to the complete absence of file extension checks, MIME type validation, and authentication requirements, attackers can upload executable PHP files to a web-accessible directory (/files/). This enables remote code execution (RCE) without any authentication, allowing complete compromise of the affected system.

Critical Impact

Unauthenticated attackers can achieve full Remote Code Execution (RCE) by uploading malicious PHP files to a web-accessible directory, enabling complete system compromise without any credentials.

Affected Products

• SourceCodester Client Database Management System 1.0
• Lerouxyxchire Client Database Management System 1.0
• Systems running user_payment_update.php with file upload functionality

Discovery Timeline

• 2025-05-09 - CVE-2025-46191 published to NVD
• 2025-05-22 - Last updated in NVD database

Technical Details for CVE-2025-46191

Vulnerability Analysis

This vulnerability represents a severe code injection flaw (CWE-94) stemming from completely missing input validation on file uploads. The user_payment_update.php script accepts file uploads through the uploaded_file_cancelled parameter without implementing any security controls. The application fails to validate file extensions, check MIME types, or require authentication before processing uploads.

When a file is uploaded, it is saved directly to the /files/ directory, which is web-accessible. Since PHP files placed in this directory can be executed by the web server, an attacker can upload a malicious PHP shell and then access it via a direct URL request to execute arbitrary commands on the server with the privileges of the web server process.

Root Cause

The root cause of this vulnerability is the complete lack of security controls in the file upload handling code. Specifically, the application:

1. Does not authenticate users before allowing file uploads
2. Does not validate or restrict file extensions (e.g., allowing .php files)
3. Does not check MIME types or file content
4. Stores uploaded files in a web-accessible directory without sanitization
5. Does not implement any filename randomization or path traversal protection

This combination of missing security controls creates a direct path for unauthenticated remote code execution.

Attack Vector

The attack can be executed remotely over the network without any authentication or user interaction. An attacker exploits this vulnerability by:

1. Crafting a malicious PHP file containing a web shell or command execution code
2. Sending a POST request to user_payment_update.php with the malicious file in the uploaded_file_cancelled field
3. The server saves the file to the /files/ directory without validation
4. Accessing the uploaded PHP file directly via the web server (e.g., http://target/files/malicious.php)
5. Executing arbitrary commands on the server through the uploaded script

The attack requires no special privileges or user credentials, making it trivially exploitable by any remote attacker who can reach the vulnerable endpoint.

Detection Methods for CVE-2025-46191

Indicators of Compromise

• Unexpected PHP files appearing in the /files/ directory
• Web server logs showing POST requests to user_payment_update.php from unknown sources followed by GET requests to files in /files/
• Unusual process execution spawned by the web server process (e.g., www-data or apache)
• Network connections originating from the web server to external command and control infrastructure

Detection Strategies

• Monitor file system changes in the /files/ directory for newly created PHP files
• Implement web application firewall (WAF) rules to detect and block file upload attempts containing PHP code
• Analyze web server access logs for patterns of POST requests to user_payment_update.php followed by requests to unknown files in /files/
• Deploy endpoint detection to identify suspicious process trees originating from web server processes

Monitoring Recommendations

• Enable file integrity monitoring on web-accessible directories, particularly /files/
• Configure alerts for PHP file creation in upload directories
• Implement network monitoring to detect outbound connections from the web server to suspicious destinations
• Review web server logs regularly for signs of exploitation attempts

How to Mitigate CVE-2025-46191

Immediate Actions Required

• Remove or disable the user_payment_update.php script if not required for business operations
• Restrict access to the /files/ directory by configuring the web server to deny execution of PHP files
• Implement authentication controls to prevent unauthenticated access to file upload functionality
• Delete any suspicious or unknown PHP files from the /files/ directory after forensic review

Patch Information

No official vendor patch has been released for this vulnerability at the time of this writing. Organizations using the SourceCodester Client Database Management System should consider the affected component deprecated and implement workarounds until a patch becomes available. For additional technical details, refer to the GitHub CVE-2025-46191 Details. The PortSwigger File Upload Guide provides comprehensive guidance on securing file upload functionality.

Workarounds

• Add .htaccess rules to prevent PHP execution in the /files/ directory
• Implement server-side file extension validation to allow only safe file types (e.g., images, documents)
• Add authentication requirements to the user_payment_update.php endpoint
• Configure the web server to store uploaded files outside the web root
• Rename uploaded files with randomized names and remove original extensions

# Configuration example - Apache .htaccess to prevent PHP execution in uploads directory
# Place this file in the /files/ directory

# Disable PHP execution
<FilesMatch "\.php$">
    SetHandler none
    SetHandler default-handler
    Options -ExecCGI
    RemoveHandler .php
</FilesMatch>

# Alternative: Deny all script execution
php_flag engine off