CVE-2025-4792
📋 TL;DR
CVE-2025-4792 is a critical buffer overflow vulnerability in FreeFloat FTP Server 1.0's MDELETE command handler that allows remote attackers to execute arbitrary code or crash the service. This affects all deployments of FreeFloat FTP Server 1.0 with the vulnerable component enabled. Attackers can exploit this without authentication to potentially gain control of affected systems.
💻 Affected Systems
- FreeFloat FTP Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, and persistent backdoor installation
Likely Case
Service disruption through denial of service and potential remote code execution for initial foothold
If Mitigated
Service crash with limited impact if proper network segmentation and least privilege are implemented
🎯 Exploit Status
Public exploit code is available, making exploitation trivial for attackers with basic skills
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: N/A
Restart Required: No
Instructions:
No official patch available. Consider migrating to a maintained FTP server solution.
🔧 Temporary Workarounds
Disable MDELETE Command
windowsDisable the vulnerable MDELETE command handler in FreeFloat FTP Server configuration
Edit configuration file to remove or disable MDELETE command support
Network Access Control
windowsRestrict FTP server access to trusted IP addresses only
Configure Windows Firewall to allow FTP only from specific IP ranges
🧯 If You Can't Patch
- Replace FreeFloat FTP Server with a maintained alternative like FileZilla Server or vsftpd
- Implement strict network segmentation to isolate FTP server from critical systems
🔍 How to Verify
Check if Vulnerable:
Check if FreeFloat FTP Server version 1.0 is installed and runningCheck Version:
Check program files directory for FreeFloat FTP Server installation and version informationVerify Fix Applied:
Verify FreeFloat FTP Server has been removed or replaced with secure alternative📡 Detection & Monitoring
Log Indicators:
- Multiple MDELETE command attempts
- FTP server crash logs
- Unusual buffer overflow error messages
Network Indicators:
- Excessive MDELETE commands to FTP server
- Malformed FTP packets targeting port 21
SIEM Query:
source="ftp.log" AND (command="MDELETE" OR error="buffer" OR error="overflow")