CVE-2024-4920 Overview
A critical unrestricted file upload vulnerability has been identified in SourceCodester Online Discussion Forum Site version 1.0. The vulnerability exists within the registerH.php file, where improper handling of the ima argument allows attackers to upload arbitrary files without proper validation. This flaw can be exploited remotely, potentially enabling attackers to upload malicious scripts and execute arbitrary code on the affected server. The exploit has been publicly disclosed, increasing the risk of active exploitation.
Critical Impact
Remote attackers can upload malicious files to achieve code execution on vulnerable systems running Online Discussion Forum Site 1.0.
Affected Products
- Razormist Online Discussion Forum Site 1.0
- Systems running registerH.php registration handler
- Web servers hosting the vulnerable PHP application
Discovery Timeline
- 2024-05-16 - CVE-2024-4920 published to NVD
- 2025-02-10 - Last updated in NVD database
Technical Details for CVE-2024-4920
Vulnerability Analysis
This vulnerability falls under CWE-434 (Unrestricted Upload of File with Dangerous Type), a common web application security flaw where applications fail to properly validate uploaded files. The registerH.php file in the Online Discussion Forum Site application processes user registration data, including image uploads through the ima parameter.
The application lacks proper file type validation, extension filtering, and content verification when handling uploaded files. This allows an attacker to bypass intended restrictions and upload files containing executable code, such as PHP web shells, which can then be accessed and executed through the web server.
The vulnerability is exploitable over the network without authentication, making it particularly dangerous in internet-facing deployments. Once a malicious file is uploaded, an attacker can potentially achieve full control over the web server.
Root Cause
The root cause of this vulnerability is insufficient input validation and file type verification in the registerH.php registration handler. The application fails to implement proper security controls for file uploads, including:
- Absence of file extension whitelisting
- Missing MIME type validation
- Lack of file content inspection
- No randomization of uploaded file names
- Potentially insecure storage of uploaded files within the web root
Attack Vector
The attack can be initiated remotely over the network by an unauthenticated attacker. The exploitation process involves sending a specially crafted HTTP request to the registerH.php endpoint with a malicious file attached to the ima parameter. Since the application does not properly validate the uploaded file, the attacker can upload executable content such as PHP web shells.
Once uploaded, the attacker can navigate to the uploaded file's location and trigger execution, gaining the ability to run arbitrary commands on the server with the privileges of the web server process. This can lead to complete server compromise, data theft, lateral movement, or use of the server as a pivot point for further attacks.
Detection Methods for CVE-2024-4920
Indicators of Compromise
- Unexpected files with executable extensions (.php, .phtml, .php5) in upload directories
- Web server logs showing requests to registerH.php with suspicious file upload attempts
- Presence of web shells or backdoor scripts in the application's upload folders
- Anomalous outbound network connections from the web server process
Detection Strategies
- Monitor file system changes in upload directories for newly created executable files
- Implement web application firewall (WAF) rules to detect file upload exploitation attempts
- Review web server access logs for unusual POST requests to registerH.php
- Deploy file integrity monitoring on web application directories
Monitoring Recommendations
- Enable verbose logging for file upload operations in the web application
- Set up alerts for new file creation events in upload directories
- Monitor for execution of PHP processes spawned from upload folders
- Implement network traffic analysis to detect command-and-control communications
How to Mitigate CVE-2024-4920
Immediate Actions Required
- Remove or restrict access to the Online Discussion Forum Site 1.0 application until patched
- Implement web server configuration to prevent execution of files in upload directories
- Apply strict file type validation at the web server and application level
- Review and remove any suspicious files from upload directories
Patch Information
No official vendor patch has been identified at this time. Users of SourceCodester Online Discussion Forum Site 1.0 should monitor the vendor's resources for security updates. In the absence of an official patch, organizations should implement the workarounds and mitigations listed below or consider migrating to an alternative, actively maintained forum solution.
For additional technical details, refer to the VulDB entry and the GitHub issue report.
Workarounds
- Disable the registration functionality by removing or renaming registerH.php
- Configure web server to deny execution of scripts in upload directories
- Implement a whitelist-based file extension filter at the application or WAF level
- Place uploaded files outside the web root to prevent direct access
- Apply network segmentation to limit exposure of vulnerable systems
# Apache configuration to prevent script execution in uploads
<Directory "/var/www/html/uploads">
php_admin_flag engine off
<FilesMatch "\.(php|phtml|php5|php7)$">
Require all denied
</FilesMatch>
</Directory>
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
