CVE-2025-5357
📋 TL;DR
CVE-2025-5357 is a critical buffer overflow vulnerability in FreeFloat FTP Server 1.0's PWD command handler that allows remote attackers to execute arbitrary code or crash the service. This affects all deployments of FreeFloat FTP Server 1.0. The vulnerability is remotely exploitable without authentication.
💻 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, or ransomware deployment
Likely Case
Service disruption through denial of service, potential remote code execution for skilled attackers
If Mitigated
Limited impact if network segmentation and exploit prevention controls are in place
🎯 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 available. Consider migrating to a supported FTP server solution.
🔧 Temporary Workarounds
Network Segmentation
windowsBlock FTP traffic (port 21) at network boundaries to prevent remote exploitation
# Example firewall rule for Windows: netsh advfirewall firewall add rule name="Block FTP" dir=in action=block protocol=TCP localport=21
Service Disablement
windowsDisable FreeFloat FTP Server service to prevent exploitation
sc stop FreeFloatFTPServer
sc config FreeFloatFTPServer start= disabled
🧯 If You Can't Patch
- Replace FreeFloat FTP Server with a maintained alternative like FileZilla Server, vsftpd, or ProFTPD
- Implement strict network access controls to limit FTP server exposure to only trusted networks
🔍 How to Verify
Check if Vulnerable:
Check if FreeFloat FTP Server 1.0 is installed and running on the systemCheck Version:
Check Windows Services for 'FreeFloat FTP Server' or examine installed programsVerify Fix Applied:
Verify the service is stopped/disabled or replaced with alternative software📡 Detection & Monitoring
Log Indicators:
- Multiple failed PWD commands
- Unusually large PWD command parameters
- Service crash events in Windows Event Log
Network Indicators:
- Excessive FTP traffic to port 21
- Malformed PWD commands in network captures
SIEM Query:
EventID=7036 AND ServiceName="FreeFloatFTPServer" OR ProcessName="FreeFloatFTPServer.exe"🔗 References
- https://fitoxs.com/exploit/exploit-c15b3c9a2d7b1618fc5a30df50e5a13d6275f109f1fba20465d4cdd76ee8772b.txt
- https://vuldb.com/?ctiid.310651
- https://vuldb.com/?id.310651
- https://vuldb.com/?submit.585641
- https://fitoxs.com/exploit/exploit-c15b3c9a2d7b1618fc5a30df50e5a13d6275f109f1fba20465d4cdd76ee8772b.txt
