CVE-2024-2394: Employee Management System RCE Vulnerability

CVE-2024-2394 Overview

A critical unrestricted file upload vulnerability has been discovered in SourceCodester Employee Management System 1.0. The vulnerability exists in the /Admin/add-admin.php file, where improper validation of the avatar parameter allows attackers to upload arbitrary files to the server. This flaw can be exploited remotely without authentication, potentially leading to remote code execution on vulnerable systems.

Critical Impact

Remote attackers can exploit this unrestricted upload vulnerability to upload malicious files such as web shells, enabling complete server compromise and remote code execution without requiring any authentication.

Affected Products

• SourceCodester Employee Management System 1.0
• walterjnr1 employee_management_system 1.0

Discovery Timeline

• 2024-03-12 - CVE-2024-2394 published to NVD
• 2025-02-26 - Last updated in NVD database

Technical Details for CVE-2024-2394

Vulnerability Analysis

This vulnerability is classified as CWE-434 (Unrestricted Upload of File with Dangerous Type). The Employee Management System fails to properly validate file types uploaded through the avatar functionality in the admin panel. The application accepts any file type without proper server-side validation, MIME type checking, or file extension filtering.

The exploit has been publicly disclosed and documented in security repositories, making this vulnerability accessible to potential attackers. The lack of input validation on file uploads represents a fundamental security flaw that can lead to complete system compromise.

Root Cause

The root cause of this vulnerability lies in the absence of proper file upload validation in the /Admin/add-admin.php endpoint. The application does not implement:

• File extension whitelisting or blacklisting
• MIME type validation
• File content inspection
• Upload directory restrictions to prevent script execution

This allows an attacker to upload executable files such as PHP web shells disguised as avatar images.

Attack Vector

The attack can be performed remotely over the network. An attacker can craft a malicious HTTP request to the /Admin/add-admin.php endpoint, manipulating the avatar parameter to upload a dangerous file type. Once uploaded, the attacker can access the malicious file directly on the web server to execute arbitrary code.

The attack sequence typically involves:

1. Crafting a malicious PHP file (web shell) with an image extension or exploiting missing extension checks
2. Uploading the file through the avatar parameter in the add-admin functionality
3. Locating the uploaded file in the predictable upload directory
4. Executing the uploaded script to gain remote code execution

For detailed technical analysis and proof-of-concept information, refer to the GitHub RCE Exploit Documentation.

Detection Methods for CVE-2024-2394

Indicators of Compromise

• Unexpected PHP or executable files in upload directories (typically /uploads/ or /avatars/)
• Web server logs showing requests to /Admin/add-admin.php with suspicious file uploads
• Newly created files with PHP extensions in image upload directories
• Unusual outbound network connections from the web server

Detection Strategies

• Monitor HTTP POST requests to /Admin/add-admin.php for file upload activity with non-image content types
• Implement file integrity monitoring on upload directories to detect unauthorized executable files
• Deploy web application firewall (WAF) rules to detect and block malicious file upload attempts
• Analyze web server logs for access patterns to uploaded files with executable extensions

Monitoring Recommendations

• Enable verbose logging on the web server to capture all file upload operations
• Configure alerts for new PHP files created in upload directories
• Monitor for web shell signatures and known malicious file patterns in uploaded content
• Implement network-level monitoring for unusual traffic originating from the web server

How to Mitigate CVE-2024-2394

Immediate Actions Required

• Remove or disable the Employee Management System if not critical to operations until a patch is available
• Restrict access to the /Admin/add-admin.php endpoint through network-level controls or authentication
• Implement a web application firewall (WAF) to filter malicious upload attempts
• Review and remove any suspicious files from upload directories

Patch Information

No official vendor patch has been released for this vulnerability. Organizations using SourceCodester Employee Management System 1.0 should consider implementing manual code fixes or migrating to an alternative solution. For additional vulnerability details, consult VulDB #256454.

Workarounds

• Implement server-side file validation to restrict uploads to image files only (e.g., .jpg, .png, .gif)
• Configure the web server to prevent script execution in upload directories using .htaccess or equivalent configurations
• Add MIME type validation to verify uploaded files match expected image types
• Rename uploaded files using random strings and store original filenames in a database
• Consider implementing a separate file storage system outside the web root

# Apache .htaccess configuration to disable script execution in upload directory
# Place this file in your uploads directory

# Disable PHP execution
php_flag engine off

# Deny access to PHP files
<FilesMatch "\.php$">
    Order Deny,Allow
    Deny from all
</FilesMatch>

# For Nginx, add to server block:
# location /uploads/ {
#     location ~ \.php$ {
#         deny all;
#     }
# }