CVE-2025-70457
📋 TL;DR
This vulnerability allows unauthenticated attackers to upload malicious PHP files disguised as images to the Modern Image Gallery App v1.0. Successful exploitation enables remote code execution, potentially leading to complete system compromise. All users running the vulnerable version are affected.
💻 Affected Systems
- Sourcecodester Modern Image Gallery App
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining complete control over the server, data theft, ransomware deployment, and lateral movement to other systems.
Likely Case
Webshell installation leading to data exfiltration, cryptocurrency mining, or use as part of a botnet.
If Mitigated
Attack blocked at perimeter with proper file upload validation and web application firewall rules.
🎯 Exploit Status
Simple file upload bypass with MIME type spoofing. No authentication required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
1. Check vendor website for updates. 2. If no patch available, implement workarounds. 3. Consider replacing with alternative software.
🔧 Temporary Workarounds
File Upload Validation
allImplement server-side file validation including file type checking, content inspection, and extension validation.
Modify gallery/upload.php to add: $allowed_extensions = ['jpg', 'jpeg', 'png', 'gif'];
Add MIME type validation: $allowed_mimes = ['image/jpeg', 'image/png', 'image/gif'];
Implement file content inspection using getimagesize() or similar functions.
Web Server Configuration
linuxConfigure web server to prevent execution of uploaded files in upload directories.
For Apache: Add 'php_flag engine off' to .htaccess in upload directory
For Nginx: Add 'location ~* \.php$ { deny all; }' to upload directory config
🧯 If You Can't Patch
- Disable the upload functionality completely by removing or restricting access to gallery/upload.php
- Implement a Web Application Firewall (WAF) with rules to block suspicious file uploads and PHP execution attempts
🔍 How to Verify
Check if Vulnerable:
Attempt to upload a PHP file with image MIME type (e.g., image/jpeg) to gallery/upload.php and check if it's saved with .php extension.Check Version:
Check the application's version.php file or documentation: cat version.php 2>/dev/null || grep -r 'version' *.phpVerify Fix Applied:
Test file upload with various malicious payloads to ensure only valid image files are accepted and stored.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to gallery/upload.php
- PHP file creation in upload directories
- Multiple failed upload attempts with unusual file types
Network Indicators:
- POST requests to gallery/upload.php with unusual Content-Type headers
- Traffic patterns showing file uploads followed by immediate PHP file execution
SIEM Query:
source="web_logs" AND uri="/gallery/upload.php" AND (content_type!="image/jpeg" AND content_type!="image/png" AND content_type!="image/gif")