CVE-2025-5295
📋 TL;DR
A critical buffer overflow vulnerability in FreeFloat FTP Server 1.0.0 allows remote attackers to execute arbitrary code via the PORT command handler. This affects all systems running the vulnerable FTP server version. Attackers can exploit this remotely without authentication to potentially gain full 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, ransomware deployment, or creation of persistent backdoors.
Likely Case
Remote code execution resulting in system compromise, service disruption, and potential lateral movement within the network.
If Mitigated
Denial of service or service crash if exploit fails, but proper controls should prevent successful exploitation.
🎯 Exploit Status
Public exploit code is available, making this easily weaponizable. The buffer overflow in the PORT command handler is straightforward to exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: N/A
Restart Required: No
Instructions:
No official patch available. FreeFloat FTP Server appears to be abandoned software. Recommended action is to migrate to a maintained FTP server solution.
🔧 Temporary Workarounds
Disable PORT command support
windowsConfigure FTP server to disable PORT command functionality if possible (may break active mode FTP transfers)
[Configuration dependent - check FTP server documentation for disabling PORT command]
Network segmentation and firewall rules
windowsRestrict access to FTP server to only trusted IP addresses
netsh advfirewall firewall add rule name="Block FTP Except Trusted" dir=in action=block protocol=TCP localport=21 remoteip=!192.168.1.0/24,10.0.0.0/8 enable=yes
🧯 If You Can't Patch
- Immediately migrate to a maintained, secure FTP server alternative (such as FileZilla Server, vsftpd, or ProFTPD)
- Implement network segmentation to isolate the vulnerable server and restrict access with firewall rules
🔍 How to Verify
Check if Vulnerable:
Check if FreeFloat FTP Server 1.0.0 is installed and running. Look for 'FreeFloat FTP Server' in installed programs or running services.Check Version:
Check program files directory for FreeFloat FTP Server installation and version information in documentation or about dialog.Verify Fix Applied:
Verify the vulnerable software has been removed or replaced with a secure alternative. Check that FTP service is no longer running FreeFloat FTP Server.📡 Detection & Monitoring
Log Indicators:
- Multiple failed PORT command attempts
- Unusually long PORT command parameters
- FTP service crashes or restarts
Network Indicators:
- Malformed PORT commands with excessive data length
- Exploit patterns in FTP traffic
SIEM Query:
source="ftp.log" AND (command="PORT" AND parameter_length>100) OR (event="buffer_overflow" OR event="crash")