CVE-2025-4238
📋 TL;DR
CVE-2025-4238 is a critical buffer overflow vulnerability in PCMan FTP Server 2.0.7's MGET command handler that allows remote attackers to execute arbitrary code or crash the service. This affects anyone running the vulnerable FTP server version. The exploit is publicly available, making attacks highly likely.
💻 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 disruption through denial of service or limited code execution depending on exploit sophistication.
If Mitigated
Limited impact if proper network segmentation and exploit prevention controls are in place.
🎯 Exploit Status
Public exploit code exists, making attacks straightforward for threat actors.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None known
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available or implementing workarounds.
🔧 Temporary Workarounds
Disable MGET command
windowsRestrict or disable the vulnerable MGET command handler in FTP server configuration.
# Configuration depends on FTP server settings; check documentation for command restrictions
Network segmentation
windowsIsolate FTP server from critical networks and restrict access to trusted IPs only.
# Use firewall rules: netsh advfirewall firewall add rule name="Block FTP" dir=in action=block protocol=TCP localport=21
🧯 If You Can't Patch
- Replace PCMan FTP Server with a maintained alternative like FileZilla Server or vsftpd.
- Implement application control to prevent execution of suspicious payloads on the host.
🔍 How to Verify
Check if Vulnerable:
Check FTP server version in interface or configuration files; if version is 2.0.7, it is vulnerable.Check Version:
# Check program version in Windows: wmic product where name="PCMan FTP Server" get versionVerify Fix Applied:
Verify version is no longer 2.0.7 or test with exploit PoC in a controlled environment.📡 Detection & Monitoring
Log Indicators:
- Multiple failed MGET commands
- Unusual buffer overflow errors in FTP logs
- Abnormal process crashes
Network Indicators:
- Excessive MGET commands from single source
- Malformed FTP packets targeting port 21
SIEM Query:
source="ftp.log" AND (command="MGET" OR error="buffer")