CVE-2023-53928
📋 TL;DR
PHPFusion 9.10.30 contains a stored cross-site scripting vulnerability in its file manager that allows attackers to upload malicious SVG files containing JavaScript. When users view these uploaded SVG files, the embedded JavaScript executes in their browsers, potentially stealing session cookies or performing other client-side attacks. This affects all PHPFusion installations running version 9.10.30.
💻 Affected Systems
- PHPFusion
📦 What is this software?
Phpfusion by Php Fusion
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal administrator session cookies, gain full administrative access to the PHPFusion installation, and compromise the entire web application and server.
Likely Case
Attackers steal user session information, perform account takeovers, deface websites, or redirect users to malicious sites.
If Mitigated
Limited impact if proper input validation and output encoding are implemented, though the vulnerability still exists.
🎯 Exploit Status
Exploitation requires attacker access to upload files (typically authenticated user). Public exploit code is available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.10.31 or later
Vendor Advisory: https://www.phpfusion.com/index.php
Restart Required: No
Instructions:
1. Backup your PHPFusion installation and database. 2. Download the latest version from phpfusion.com. 3. Replace all files with the updated version. 4. Run any database update scripts if provided. 5. Test functionality.
🔧 Temporary Workarounds
Disable SVG uploads
allModify file manager configuration to block SVG file uploads entirely.
Edit PHPFusion configuration to remove 'svg' from allowed file types in file manager settings.
Implement Content Security Policy
allAdd CSP headers to prevent inline script execution in SVG files.
Add 'Content-Security-Policy: script-src 'self'' header to web server configuration.
🧯 If You Can't Patch
- Implement strict file type validation to reject SVG files at the web application level.
- Deploy a web application firewall (WAF) with XSS protection rules to block malicious SVG uploads.
🔍 How to Verify
Check if Vulnerable:
Check if running PHPFusion version 9.10.30 by examining the version in admin panel or checking PHPFusion files.Check Version:
Check includes/core_functions_include.php or admin panel for version information.Verify Fix Applied:
Verify installation is running PHPFusion 9.10.31 or later. Test SVG upload functionality to ensure proper sanitization.📡 Detection & Monitoring
Log Indicators:
- Unusual SVG file uploads, especially with script tags in content
- Multiple failed upload attempts with SVG files
Network Indicators:
- HTTP POST requests uploading SVG files to file manager endpoints
- Subsequent requests with stolen session cookies
SIEM Query:
source="web_server_logs" AND (uri_path="/file_manager/upload" OR file_extension=".svg")