Add a scanner module for CVE-2013-0156

Author: HD Moore

modules/auxiliary/scanner/http/rails_xml_yaml_scanner.rb

@@ -0,0 +1,90 @@
+##
+# This file is part of the Metasploit Framework and may be subject to
+# redistribution and commercial restrictions. Please see the Metasploit
+# Framework web site for more information on licensing and terms of use.
+#   http://metasploit.com/framework/
+##
+
+require 'msf/core'
+
+class Metasploit3 < Msf::Auxiliary
+
+	include Msf::Exploit::Remote::HttpClient
+	include Msf::Auxiliary::Scanner
+
+	def initialize(info={})
+		super(update_info(info,
+			'Name'        => 'Ruby on Rails XML Processor YAML Deserialization Scanner',
+			'Description' => %q{
+				This module attempts to identify Ruby on Rails instances vulnerable to
+				an arbitrary object instantiation flaw in the XML request processor.
+			},
+			'Author'      => 'hdm',
+			'License'     => MSF_LICENSE,
+			'References'  =>
+				[
+					['CVE', '2013-0156'],
+					['URL', 'https://community.rapid7.com/community/metasploit/blog/2013/01/09/serialization-mischief-in-ruby-land-cve-2013-0156']
+				]
+		))
+
+		register_options(
+			OptString.new('URIPATH', [true, "The URI to test", "/"])
+		], self.class)
+	end
+
+	def send_probe(ptype, pdata)
+		odata = %Q^<?xml version="1.0" encoding="UTF-8"?>\n<probe type="#{ptype}"><![CDATA[\n#{pdata}\n]]></probe>^
+		begin
+			res = send_request_cgi({
+				'uri'    => datastore['URIPATH'] || "/",
+				'method' => 'POST',
+				'ctype'  => 'application/xml',
+				'data'   => odata
+			}, 25)
+		rescue ::Timeout::Error
+			nil
+		end
+	end
+
+	def run_host(ip)
+
+		res1 = send_probe("string", "hello")
+		res2 = send_probe("yaml", "--- !ruby/object:Time {}\n")
+		res3 = send_probe("yaml", "--- !ruby/object:\x00")
+
+		unless res1
+			vprint_status("#{rhost}:#{rport} No reply to the initial XML request")
+			return
+		end
+
+		unless res2
+			vprint_status("#{rhost}:#{rport} No reply to the initial YAML probe")
+			return
+		end
+
+		unless res3
+			vprint_status("#{rhost}:#{rport} No reply to the second YAML probe")
+			return
+		end
+
+		if res1.code.to_s =~ /^[45]/
+			vprint_status("#{rhost}:#{rport} The server replied with #{res1.code} for our initial XML request, double check URIPATH")
+		end
+
+		if res2.code.to_s =~ /^[23]/ and res3.code != res2.code and res3.code != 200
+			print_good("#{rhost}:#{rport} is likely vulnerable due to a #{res3.code} reply for invalid YAML")
+			report_vuln({
+				:host	=> rhost,
+				:port	=> rport,
+				:proto  => 'tcp',
+				:name	=> self.name,
+				:info	=> "Module triggered a #{res3.code} reply",
+				:refs   => self.references
+			})
+		else
+			vprint_status("#{rhost}:#{rport} is not likely to be vulnerable or URIPATH must be set")
+		end
+	end
+
+end