CVE-2024-6110: Beach Resort System RCE Vulnerability

CVE-2024-6110 Overview

A critical unrestricted file upload vulnerability has been discovered in itsourcecode Magbanua Beach Resort Online Reservation System version 1.0. The vulnerability exists in the controller.php file where improper validation of the image parameter allows attackers to upload arbitrary files to the server. This flaw can be exploited remotely without authentication, potentially leading to remote code execution if malicious scripts are uploaded and executed on the target server.

Critical Impact

Remote attackers can exploit this unrestricted file upload vulnerability to upload malicious files, potentially achieving remote code execution on affected web servers running the Magbanua Beach Resort Online Reservation System.

Affected Products

• Janobe Magbanua Beach Resort Online Reservation System version 1.0
• itsourcecode Magbanua Beach Resort Online Reservation System up to version 1.0

Discovery Timeline

• June 18, 2024 - CVE-2024-6110 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2024-6110

Vulnerability Analysis

This vulnerability is classified as CWE-434 (Unrestricted Upload of File with Dangerous Type). The affected application fails to properly validate uploaded files through the image parameter in controller.php. Without proper file type validation, content inspection, or extension filtering, an attacker can upload files with arbitrary content and potentially dangerous extensions such as .php, .phtml, or other server-executable scripts.

The vulnerability is accessible over the network without requiring authentication or user interaction. An attacker can exploit this weakness to upload web shells or other malicious scripts that, when accessed, execute arbitrary commands on the underlying server with the privileges of the web server process.

Root Cause

The root cause of this vulnerability is the absence of proper input validation and file type restrictions in the file upload functionality within controller.php. The application does not implement security controls such as:

• File extension whitelisting
• MIME type validation
• File content inspection
• Secure file storage outside the web root
• Randomization of uploaded file names

This allows attackers to bypass any intended restrictions and upload files with dangerous content types that can be executed server-side.

Attack Vector

The attack can be launched remotely over the network. An attacker targets the controller.php endpoint and manipulates the image parameter to upload a malicious file. The exploit has been disclosed to the public and may be actively used. The attack flow typically involves:

1. Identifying the vulnerable file upload endpoint in controller.php
2. Crafting a malicious file (e.g., a PHP web shell) with appropriate content
3. Uploading the malicious file via the image parameter
4. Accessing the uploaded file through the web server to trigger execution
5. Achieving remote code execution on the target server

For technical details regarding this vulnerability, refer to the GitHub CVE Issue and VulDB entry #268856.

Detection Methods for CVE-2024-6110

Indicators of Compromise

• Unusual PHP files or web shells appearing in upload directories
• Unexpected files with executable extensions (.php, .phtml, .asp) in image upload locations
• Web server logs showing requests to recently uploaded files in upload directories
• Suspicious POST requests to controller.php with file upload payloads

Detection Strategies

• Monitor file upload directories for newly created files with executable extensions
• Implement web application firewall (WAF) rules to inspect file upload requests for malicious content
• Review web server access logs for suspicious requests to upload directories
• Use file integrity monitoring (FIM) to detect unauthorized file creations in web-accessible directories

Monitoring Recommendations

• Enable detailed logging on the web server to capture all file upload activities
• Configure alerts for any new executable files created in upload directories
• Monitor outbound network connections from the web server for potential command-and-control traffic
• Regularly scan web directories for known web shell signatures and suspicious files

How to Mitigate CVE-2024-6110

Immediate Actions Required

• Remove or disable the vulnerable file upload functionality in controller.php until a patch is available
• Implement strict file type validation including extension whitelisting and MIME type verification
• Store uploaded files outside the web root directory to prevent direct execution
• Review existing uploads for any suspicious or malicious files and remove them immediately
• Consider taking the application offline if it is exposed to the internet and cannot be immediately patched

Patch Information

No official patch information is currently available from the vendor. Organizations using this application should implement the workarounds described below and monitor the VulDB entry and vendor channels for updates. Consider replacing this application with a more actively maintained alternative if patches are not forthcoming.

Workarounds

• Implement server-side file upload validation that checks file extensions against a strict whitelist (e.g., only .jpg, .png, .gif)
• Configure the web server to prevent execution of scripts in upload directories using .htaccess or equivalent configuration
• Use a Web Application Firewall (WAF) to filter malicious file upload attempts
• Rename uploaded files to random names and store them with non-executable extensions
• Restrict access to the application to trusted networks only using firewall rules or VPN

# Apache configuration to prevent script execution in uploads directory
# Add to .htaccess in the uploads folder or server configuration
<Directory "/var/www/html/uploads">
    # Disable PHP execution
    php_flag engine off
    
    # Deny access to executable file types
    <FilesMatch "\.(php|phtml|php3|php4|php5|phps|cgi|pl|asp|aspx|shtml|shtm|fcgi|fpl|jsp|htm|html|wml)$">
        Require all denied
    </FilesMatch>
    
    # Only allow specific image types
    <FilesMatch "^.*\.(jpg|jpeg|png|gif|webp)$">
        Require all granted
    </FilesMatch>
</Directory>