CVE-2025-3042: Time Table Generator RCE Vulnerability

CVE-2025-3042 Overview

A critical unrestricted file upload vulnerability has been identified in Project Worlds Online Time Table Generator version 1.0. The vulnerability exists in the /student/updateprofile.php file, where improper validation of the pic parameter allows attackers to upload arbitrary files to the server. This flaw enables remote attackers to potentially execute malicious code by uploading dangerous file types, such as PHP scripts, that can then be accessed and executed on the target server.

Critical Impact

Remote attackers can exploit this vulnerability to upload and execute malicious files on the server, potentially leading to complete system compromise, data theft, or further lateral movement within the network.

Affected Products

• Project Worlds Online Time Table Generator 1.0
• Systems running the vulnerable /student/updateprofile.php endpoint

Discovery Timeline

• 2025-04-01 - CVE-2025-3042 published to NVD
• 2025-07-09 - Last updated in NVD database

Technical Details for CVE-2025-3042

Vulnerability Analysis

This vulnerability is classified under CWE-434 (Unrestricted Upload of File with Dangerous Type) and CWE-284 (Improper Access Control). The application fails to properly validate file uploads in the student profile update functionality, allowing users to upload files without adequate restrictions on file type, content, or extension.

The vulnerable endpoint /student/updateprofile.php processes the pic parameter without implementing sufficient security controls. This allows an attacker to bypass intended restrictions and upload executable files such as PHP web shells or other malicious payloads. Once uploaded, these files can typically be accessed directly through the web server, resulting in arbitrary code execution within the context of the web application.

Root Cause

The root cause of this vulnerability is the absence of proper file upload validation mechanisms in the updateprofile.php script. The application does not implement:

• File extension whitelisting to restrict uploads to safe file types (e.g., .jpg, .png, .gif)
• MIME type validation to verify the actual content type of uploaded files
• File content inspection to detect embedded malicious code
• Secure file storage practices that prevent direct execution of uploaded files

Attack Vector

This vulnerability is exploitable remotely over the network. An authenticated user with access to the student profile update functionality can craft a malicious HTTP POST request to the /student/updateprofile.php endpoint containing a dangerous file in the pic parameter.

The attacker would typically:

1. Authenticate to the application as a student user
2. Navigate to the profile update functionality
3. Upload a malicious file (e.g., PHP web shell) disguised or presented as an image
4. Access the uploaded file directly via the web server to execute arbitrary commands

Since the exploit has been publicly disclosed, organizations using this software should consider themselves at elevated risk. For technical details, refer to the GitHub Issue Discussion and VulDB entry #302104.

Detection Methods for CVE-2025-3042

Indicators of Compromise

• Unusual file types appearing in upload directories (e.g., .php, .phtml, .phar files in image upload folders)
• Web server access logs showing requests to unusual files in profile picture directories
• Unexpected outbound network connections originating from the web server process
• New or modified files with PHP extensions in directories intended for image storage

Detection Strategies

• Monitor web server logs for POST requests to /student/updateprofile.php with unusual payload sizes or content types
• Implement file integrity monitoring on upload directories to detect new executable files
• Deploy web application firewalls (WAF) with rules to detect file upload attacks and web shell patterns
• Use endpoint detection solutions to identify suspicious process spawning from web server processes

Monitoring Recommendations

• Enable detailed logging for the web application, including all file upload operations
• Configure alerts for any file creation events in upload directories that do not match expected image extensions
• Monitor for execution of command-line tools (cmd.exe, sh, bash) spawned by web server processes
• Review server logs regularly for requests containing common web shell patterns or encoded payloads

How to Mitigate CVE-2025-3042

Immediate Actions Required

• Restrict access to the /student/updateprofile.php endpoint if not immediately required for business operations
• Review and remove any suspicious files from upload directories
• Implement network segmentation to limit the blast radius if the web server is compromised
• Consider deploying a web application firewall with file upload inspection capabilities

Patch Information

At the time of publication, no official vendor patch has been released for this vulnerability. Organizations should monitor the VulDB entry and vendor communications for patch availability. Given the nature of this open-source project, administrators may need to implement their own mitigations or consider the code-level workarounds described below.

Workarounds

• Implement server-side file extension whitelisting to allow only legitimate image formats (.jpg, .jpeg, .png, .gif)
• Validate MIME types and file magic bytes to ensure uploaded files match their claimed format
• Store uploaded files outside the web root or in a location where script execution is disabled
• Rename uploaded files to random strings and strip any executable extensions
• Configure the web server to prevent execution of scripts in upload directories

# Apache configuration to prevent PHP execution in upload directories
# Add to .htaccess in the upload directory
<Directory /path/to/uploads>
    php_flag engine off
    <FilesMatch "\.(php|phtml|php3|php4|php5|phps|phar)$">
        Require all denied
    </FilesMatch>
</Directory>

# Nginx configuration example
location /uploads {
    location ~ \.php$ {
        deny all;
    }
}