CVE-2022-44276
📋 TL;DR
CVE-2022-44276 is a critical vulnerability in Responsive Filemanager that allows attackers to bypass upload restrictions and achieve remote code execution. This affects all systems running Responsive Filemanager versions below 9.12.0. Attackers can upload malicious files that get executed on the server.
💻 Affected Systems
- Responsive Filemanager
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary code, steal data, install backdoors, or pivot to other systems.
Likely Case
Web server compromise leading to data theft, defacement, or use as part of a botnet.
If Mitigated
Limited impact with proper file upload validation and execution restrictions in place.
🎯 Exploit Status
Public proof-of-concept code is available, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.12.0 and later
Vendor Advisory: https://github.com/trippo/ResponsiveFilemanager/releases/tag/v9.12.0
Restart Required: No
Instructions:
1. Backup your current installation. 2. Download version 9.12.0 or later from the official repository. 3. Replace the existing files with the patched version. 4. Verify the version is updated to 9.12.0 or higher.
🔧 Temporary Workarounds
Disable file upload functionality
allTemporarily disable file upload features in Responsive Filemanager configuration
Edit configuration file to set upload_enabled = false
Implement strict file type validation
allAdd server-side validation to reject all file types except explicitly allowed ones
Add file type validation in upload handler before processing
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block suspicious file upload patterns
- Isolate the vulnerable system in a restricted network segment with no internet access
🔍 How to Verify
Check if Vulnerable:
Check the version of Responsive Filemanager installed. If version is below 9.12.0, the system is vulnerable.Check Version:
Check the version number in the Responsive Filemanager configuration files or admin interfaceVerify Fix Applied:
Verify the version is 9.12.0 or higher and test file upload functionality with restricted file types.📡 Detection & Monitoring
Log Indicators:
- Unusual file upload attempts, especially with executable extensions
- Multiple failed upload attempts followed by successful upload of suspicious files
Network Indicators:
- HTTP POST requests to file upload endpoints with unusual file types
- Traffic patterns indicating file upload exploitation attempts
SIEM Query:
source="web_server" AND (uri="/filemanager/upload" OR uri="/filemanager/*/upload") AND (file_extension="php" OR file_extension="exe" OR file_extension="sh")