CVE-2025-63994
📋 TL;DR
An arbitrary file upload vulnerability in RichFilemanager v2.7.6 allows attackers to upload malicious files to the server, potentially leading to remote code execution. This affects any system running the vulnerable version of RichFilemanager with the upload functionality accessible. Attackers can compromise the server and gain control over the affected system.
💻 Affected Systems
- RichFilemanager
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise leading to data theft, ransomware deployment, lateral movement within the network, and persistent backdoor installation.
Likely Case
Webshell upload leading to unauthorized file access, data exfiltration, and potential privilege escalation on the server.
If Mitigated
File upload attempts blocked or quarantined with no code execution due to proper file validation and server hardening.
🎯 Exploit Status
The vulnerability is simple to exploit - attackers only need to craft a malicious file and upload it to the vulnerable endpoint. Public proof-of-concept exists in the GitHub issue.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v2.7.7 or later
Vendor Advisory: https://github.com/psolom/RichFilemanager/issues/412
Restart Required: No
Instructions:
1. Backup current installation. 2. Download latest version from official repository. 3. Replace vulnerable files with patched version. 4. Verify upload functionality works correctly with proper file validation.
🔧 Temporary Workarounds
Disable Upload Handler
linuxTemporarily disable the vulnerable UploadHandler.php component
mv /path/to/php/UploadHandler.php /path/to/php/UploadHandler.php.disabled
Implement File Type Validation
allAdd strict file extension and MIME type validation before processing uploads
🧯 If You Can't Patch
- Implement Web Application Firewall (WAF) rules to block malicious file uploads
- Restrict access to the upload endpoint using network ACLs or authentication
🔍 How to Verify
Check if Vulnerable:
Check if RichFilemanager version is 2.7.6 and if /php/UploadHandler.php exists and is accessibleCheck Version:
grep -r 'version' /path/to/richfilemanager/ | grep -i '2.7.6'Verify Fix Applied:
Verify version is 2.7.7 or later and test file upload with malicious extensions to ensure they are rejected📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads with PHP/executable extensions
- Multiple failed upload attempts
- Uploads to /php/UploadHandler.php from suspicious IPs
Network Indicators:
- POST requests to /php/UploadHandler.php with executable file content
- Unusual outbound connections from web server after file upload
SIEM Query:
source="web_logs" AND uri="/php/UploadHandler.php" AND (file_extension="php" OR file_extension="exe" OR file_extension="sh")