CVE-2024-12233: Online Notice Board RCE Vulnerability

CVE-2024-12233 Overview

A critical unrestricted file upload vulnerability has been identified in the Fabian Online Notice Board application up to version 1.0. The vulnerability exists within the Profile Picture Handler component, specifically in the /registration.php file. By manipulating the img parameter, an attacker can upload arbitrary files without proper validation, potentially leading to remote code execution on the affected server.

Critical Impact

Attackers can exploit this unrestricted file upload vulnerability remotely to upload malicious files, potentially achieving code execution on the target server and compromising the entire web application.

Affected Products

• Fabian Online Notice Board version 1.0 and earlier
• Web applications utilizing the vulnerable /registration.php Profile Picture Handler component

Discovery Timeline

• 2024-12-05 - CVE-2024-12233 published to NVD
• 2025-10-23 - Last updated in NVD database

Technical Details for CVE-2024-12233

Vulnerability Analysis

This vulnerability is classified under CWE-434 (Unrestricted Upload of File with Dangerous Type) and CWE-284 (Improper Access Control). The Profile Picture Handler in /registration.php fails to properly validate uploaded files, allowing attackers to bypass intended restrictions and upload files with dangerous types such as PHP scripts, web shells, or other executable content.

The vulnerability is exploitable remotely without authentication, meaning any attacker with network access to the application can attempt exploitation. The lack of proper file type validation, extension checking, and content verification creates a direct path for malicious file uploads that can be subsequently accessed and executed on the server.

Root Cause

The root cause of this vulnerability lies in the insufficient input validation and file type verification within the Profile Picture Handler component. The application fails to implement proper server-side validation mechanisms to ensure uploaded files conform to expected image formats. Key security controls missing include:

• Proper MIME type validation
• File extension whitelist enforcement
• Content-based file type verification (magic bytes checking)
• Secure file storage outside the web root

Attack Vector

The attack is initiated remotely over the network. An attacker can exploit this vulnerability by accessing the /registration.php endpoint and manipulating the img parameter to upload a malicious file disguised as a profile picture. The uploaded file can contain executable code (such as a PHP web shell) that, when accessed through the web server, executes with the privileges of the web application.

The exploitation typically follows this sequence: the attacker crafts a malicious file with a double extension or manipulates headers to bypass basic client-side validation, submits the file through the registration form's profile picture upload functionality, and then accesses the uploaded file directly to trigger code execution.

Technical details regarding exploitation methodology are available in the GitHub CVE Exploit Document.

Detection Methods for CVE-2024-12233

Indicators of Compromise

• Unexpected file types appearing in profile picture upload directories (e.g., .php, .phtml, .asp files)
• Suspicious HTTP requests to /registration.php with unusual file upload patterns
• Web shell signatures or malicious scripts present in upload directories
• Anomalous outbound network connections from the web server process

Detection Strategies

• Monitor file upload directories for non-image file extensions and executable content
• Implement web application firewall (WAF) rules to detect file upload attacks targeting /registration.php
• Configure intrusion detection systems (IDS) to alert on patterns associated with web shell deployment
• Review web server access logs for requests to uploaded files with executable extensions

Monitoring Recommendations

• Enable detailed logging for all file upload operations within the application
• Set up file integrity monitoring (FIM) on upload directories to detect unauthorized file additions
• Monitor for unusual process spawning from the web server service
• Implement anomaly detection for HTTP POST requests with large payloads targeting the registration endpoint

How to Mitigate CVE-2024-12233

Immediate Actions Required

• Restrict or disable the profile picture upload functionality until a patch is applied
• Implement server-side file validation to only allow legitimate image file types (JPEG, PNG, GIF)
• Configure the web server to prevent execution of scripts in upload directories
• Apply file extension whitelisting and reject any uploads not matching allowed image extensions

Patch Information

As of the last modification date (2025-10-23), no official vendor patch has been documented for this vulnerability. Organizations using the Fabian Online Notice Board application should monitor the Code Projects website for updates and consider implementing the workarounds below until an official fix is released.

Additional technical details and vulnerability tracking information can be found at VulDB #286979.

Workarounds

• Implement strict file type validation using MIME type checking and magic byte verification
• Store uploaded files outside the web root directory and serve them through a content-disposition handler
• Rename uploaded files to remove original extensions and use randomized filenames
• Configure .htaccess or web server rules to deny script execution in upload directories
• Consider implementing a Content Security Policy (CSP) to mitigate potential attack impact

# Apache configuration to prevent script execution in upload directories
<Directory "/var/www/html/uploads">
    # Disable PHP execution
    php_admin_flag engine off
    
    # Prevent execution of common script types
    <FilesMatch "\.(php|phtml|php3|php4|php5|pl|py|jsp|asp|cgi|sh)$">
        Require all denied
    </FilesMatch>
    
    # Force content-disposition for all files
    <FilesMatch ".*">
        Header set Content-Disposition attachment
    </FilesMatch>
</Directory>