CVE-2023-53942
📋 TL;DR
File Thingie 2.5.7 contains an authenticated file upload vulnerability that allows remote attackers to upload malicious PHP zip archives. Attackers can then unzip and execute arbitrary system commands through crafted PHP scripts. This affects any system running File Thingie 2.5.7 with authenticated user access.
💻 Affected Systems
- File Thingie
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full server compromise allowing attackers to execute arbitrary commands, steal data, install backdoors, or pivot to other systems.
Likely Case
Unauthorized file upload leading to remote code execution, data exfiltration, or website defacement.
If Mitigated
Limited impact if proper file upload restrictions and authentication controls are in place.
🎯 Exploit Status
Exploit requires authenticated access but is straightforward with publicly available proof-of-concept code.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.5.8 or later
Vendor Advisory: https://github.com/leefish/filethingie
Restart Required: No
Instructions:
1. Download File Thingie 2.5.8 or later from the official GitHub repository. 2. Replace all existing File Thingie files with the updated version. 3. Verify the version number in the admin interface.
🔧 Temporary Workarounds
Restrict file upload extensions
allConfigure web server to block PHP file uploads and execution in upload directories.
# Apache: Add to .htaccess in upload directory
<FilesMatch "\.(php|php5|php7|phtml)$">
Order Allow,Deny
Deny from all
</FilesMatch>
# Nginx: Add to server block
location ~ \.php$ {
deny all;
}
Disable zip upload functionality
allRemove or disable zip file upload capability in File Thingie configuration.
# Edit File Thingie configuration to remove zip from allowed upload types
🧯 If You Can't Patch
- Disable File Thingie entirely and use alternative file management solutions.
- Implement strict network segmentation to isolate File Thingie instances from critical systems.
🔍 How to Verify
Check if Vulnerable:
Check File Thingie version in admin interface or by examining source files. Version 2.5.7 is vulnerable.Check Version:
Check admin interface or examine ft2.php file version header.Verify Fix Applied:
Verify version is 2.5.8 or later in admin interface. Test file upload functionality with PHP files to ensure they are blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads with .php extensions in zip files
- Multiple failed authentication attempts followed by successful login and file upload
- Execution of system commands via web requests
Network Indicators:
- HTTP POST requests to upload.php with zip files
- HTTP requests to unexpected PHP files in upload directories
SIEM Query:
source="web_logs" AND (uri="/upload.php" AND method="POST" AND file_extension="zip") OR (uri MATCHES "\.php$" AND referrer CONTAINS "upload")