CVE-2025-4845
📋 TL;DR
A critical buffer overflow vulnerability exists in FreeFloat FTP Server 1.0's TRACE command handler, allowing 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. The exploit is publicly available and can be launched remotely without authentication.
💻 Affected Systems
- FreeFloat FTP Server
📦 What is this software?
Ftp Server by Freefloat
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Service crash causing denial of service, potentially followed by remote code execution.
If Mitigated
Denial of service only if exploit fails or controls limit impact.
🎯 Exploit Status
Public exploit code is available, making exploitation straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: N/A
Restart Required: No
Instructions:
No official patch is available. Consider upgrading to a supported FTP server or implementing workarounds.
🔧 Temporary Workarounds
Disable TRACE Command
windowsDisable the TRACE command handler in FreeFloat FTP Server configuration to prevent exploitation.
Edit configuration file to remove or disable TRACE command support.
Network Segmentation
allRestrict access to FreeFloat FTP Server using firewall rules to limit exposure.
Add firewall rule to block external access to FTP port (default 21).
🧯 If You Can't Patch
- Replace FreeFloat FTP Server with a supported and secure alternative.
- Implement network-based intrusion prevention systems (IPS) to block exploit attempts.
🔍 How to Verify
Check if Vulnerable:
Check if FreeFloat FTP Server 1.0 is installed and running. Use version command or check installed programs.Check Version:
Check program version in Windows Add/Remove Programs or server interface.Verify Fix Applied:
Verify TRACE command is disabled in configuration or server is replaced/segmented.📡 Detection & Monitoring
Log Indicators:
- Unusual TRACE command usage in FTP logs.
- Server crash or abnormal termination logs.
Network Indicators:
- Incoming connections sending malformed TRACE commands to FTP port.
SIEM Query:
source="ftp_logs" AND command="TRACE" AND payload_length>normal