CVE-2025-11354: Fabian Hotel Reservation System RCE Flaw

CVE-2025-11354 Overview

A critical unrestricted file upload vulnerability has been identified in the Fabian Online Hotel Reservation System version 1.0. The flaw exists in the /admin/addslideexec.php file, where improper validation of the image parameter allows attackers to upload arbitrary files to the server. This vulnerability can be exploited remotely by authenticated users with low privileges, potentially leading to remote code execution if malicious scripts are uploaded and executed on the target system.

Critical Impact

Attackers can upload malicious files (such as PHP web shells) through the vulnerable image upload functionality, potentially gaining full control of the web server and compromising sensitive hotel reservation data.

Affected Products

• Fabian Online Hotel Reservation System 1.0
• Systems running /admin/addslideexec.php with improper file upload validation

Discovery Timeline

• 2025-10-07 - CVE-2025-11354 published to NVD
• 2025-10-14 - Last updated in NVD database

Technical Details for CVE-2025-11354

Vulnerability Analysis

This vulnerability falls under CWE-434 (Unrestricted Upload of File with Dangerous Type) and CWE-284 (Improper Access Control). The /admin/addslideexec.php endpoint is designed to handle image uploads for slideshow functionality within the hotel reservation system's administrative interface. However, the implementation fails to properly validate uploaded file types, extensions, or content, allowing attackers to bypass intended restrictions and upload arbitrary files.

The vulnerability can be exploited by any authenticated user with access to the admin panel, regardless of their privilege level. Once a malicious file (such as a PHP web shell) is uploaded, the attacker can execute arbitrary commands on the underlying server by accessing the uploaded file directly through the web server.

Root Cause

The root cause of this vulnerability is the absence of proper server-side validation for uploaded files in the addslideexec.php script. The application relies solely on client-side checks or lacks validation entirely for the image parameter. This allows attackers to manipulate the file upload request to bypass any superficial restrictions and upload executable scripts or other dangerous file types.

Key issues include:

• No server-side MIME type validation
• No file extension whitelist enforcement
• No content inspection to verify the uploaded file is actually an image
• Files stored in a web-accessible directory without execution restrictions

Attack Vector

The attack is network-based and requires low privileges (authenticated admin access). An attacker can exploit this vulnerability by crafting a malicious HTTP POST request to /admin/addslideexec.php, substituting a legitimate image file with a malicious PHP script or other executable content. The exploitation flow involves:

1. Authenticating to the admin panel with valid credentials
2. Navigating to the slideshow image upload functionality
3. Intercepting the upload request and replacing the image file with a malicious PHP web shell
4. Submitting the modified request to bypass client-side validation
5. Accessing the uploaded file directly via its web-accessible path to execute arbitrary commands

The vulnerability has been publicly disclosed and exploit information is available through the GitHub Issue #31 Discussion and VulDB #327239.

Detection Methods for CVE-2025-11354

Indicators of Compromise

• Unexpected PHP files or non-image files appearing in the slideshow upload directory
• Web server access logs showing requests to /admin/addslideexec.php followed by requests to unusual file paths
• Presence of web shell files (e.g., files containing system(), exec(), passthru() PHP functions)
• Unusual outbound network connections from the web server process

Detection Strategies

• Monitor file system changes in the image upload directories for non-image file types
• Implement Web Application Firewall (WAF) rules to detect and block malicious file upload attempts
• Analyze HTTP POST requests to /admin/addslideexec.php for suspicious content types or file extensions
• Deploy file integrity monitoring on web-accessible directories

Monitoring Recommendations

• Enable detailed logging for all administrative actions including file uploads
• Set up alerts for any PHP file creation in image upload directories
• Monitor server resource utilization for signs of command execution abuse
• Review admin panel access logs for unusual authentication patterns or geographic anomalies

How to Mitigate CVE-2025-11354

Immediate Actions Required

• Restrict access to the /admin/addslideexec.php endpoint until a patch is available
• Implement server-side file type validation using MIME type checking and file extension whitelisting
• Configure the web server to prevent execution of scripts in upload directories
• Review and remove any suspicious files from the upload directories

Patch Information

As of the last update on 2025-10-14, no official patch has been released by the vendor. Organizations using Fabian Online Hotel Reservation System 1.0 should implement the workarounds described below and monitor Code Projects Resource Hub for security updates. Additional technical details are available through VulDB CTI ID #327239.

Workarounds

• Add server-side validation to verify uploaded files are legitimate images (check magic bytes, MIME type, and extension)
• Rename uploaded files to remove original extensions and add .jpg or other safe extensions
• Store uploaded files outside the web root and serve them through a separate script that sets proper content-type headers
• Configure Apache or Nginx to disable script execution in upload directories

# Apache configuration to disable PHP execution in upload directory
# Add to .htaccess in the upload directory
<FilesMatch "\.(php|phtml|php3|php4|php5|phps)$">
    Order Deny,Allow
    Deny from all
</FilesMatch>

# Nginx configuration alternative
# Add to server block configuration
location /uploads/ {
    location ~ \.php$ {
        deny all;
    }
}