CVE-2025-3725
📋 TL;DR
A critical buffer overflow vulnerability exists in PCMan FTP Server 2.0.7's MIC command handler, allowing remote attackers to execute arbitrary code or crash the service. This affects anyone running the vulnerable FTP server version. The exploit is publicly available and can be launched remotely without authentication.
💻 Affected Systems
- PCMan 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 crash causing denial of service, with potential for RCE if exploit is refined
If Mitigated
Service disruption only if exploit attempts are blocked at network perimeter
🎯 Exploit Status
Exploit code is publicly available at the provided references; buffer overflow can be triggered remotely
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None found in provided references
Restart Required: Yes
Instructions:
1. Check for updated version from vendor. 2. If no patch available, consider alternative FTP server software. 3. Apply workarounds immediately.
🔧 Temporary Workarounds
Network Segmentation
allBlock FTP port 21 at network perimeter to prevent external exploitation
# Example firewall rule for Windows: netsh advfirewall firewall add rule name="Block FTP" dir=in action=block protocol=TCP localport=21
# Example for Linux: iptables -A INPUT -p tcp --dport 21 -j DROP
Disable MIC Command
windowsIf server configuration allows, disable MIC command handler functionality
# Check server configuration files for MIC command settings
# Modify configuration to disable or restrict MIC command if possible
🧯 If You Can't Patch
- Replace PCMan FTP Server with alternative secure FTP server software
- Implement strict network access controls allowing only trusted IPs to connect
🔍 How to Verify
Check if Vulnerable:
Check PCMan FTP Server version: 1. Open server interface. 2. Navigate to Help > About. 3. Verify version is 2.0.7.Check Version:
# Check running process: tasklist | findstr "ftpserver" or check installed programs in Control PanelVerify Fix Applied:
Verify server is no longer version 2.0.7 or has been replaced with alternative software📡 Detection & Monitoring
Log Indicators:
- Multiple failed connection attempts to FTP port 21
- Unusual MIC command usage patterns
- Server crash logs with buffer overflow indicators
Network Indicators:
- Excessive traffic to FTP port 21 from untrusted sources
- Patterns matching known exploit payloads in FTP traffic
SIEM Query:
source="ftp_logs" AND (message="*buffer overflow*" OR message="*MIC command*" OR message="*crash*")