QCubed 3.1.1 PHP Object Injection

`QCubed PHP Object Injection  
===========================  
  
| Identifier: | AIT-SA-20210215-01 |  
| Target: | QCubed Framework |  
| Vendor: | QCubed |  
| Version: | all versions including 3.1.1 |  
| CVE: | CVE-2020-24914 |  
| Accessibility: | Remote |  
| Severity: | Critical |  
| Author: | Wolfgang Hotwagner (AIT Austrian Institute of Technology) |  
  
SUMMARY  
=======  
QCubed is a PHP Model-View-Controller Rappid Application Development framework. (https://github.com/qcubed/qcubed)  
  
VULNERABILITY DESCRIPTION  
=========================  
A PHP object injection bug in profile.php in qcubed (all versions including 3.1.1) unserializes the untrusted data of the POST-variable "strProfileData" and allows an unauthenticated attacker to execute code via a crafted POST request.  
  
qcubed/assets/php/profile.php:  
<?php   
require_once('./qcubed.inc.php');  
  
//Exit gracefully if called directly or profiling data is missing.  
if ( !isset($_POST['intDatabaseIndex']) && !isset($_POST['strProfileData']) && !isset($_POST['strReferrer']) )  
exit('Nothing to profile. No Database Profiling data recived.');  
  
if ( !isset($_POST['intDatabaseIndex']) || !isset($_POST['strProfileData']) || !isset($_POST['strReferrer']) )  
throw new Exception('Database Profiling data appears to have been corrupted.');  
  
$intDatabaseIndex = intval($_POST['intDatabaseIndex']);  
$strReferrer = QApplication::HtmlEntities($_POST['strReferrer']);  
  
$objProfileArray = unserialize(base64_decode($_POST['strProfileData'])); //<-VULNERABLE CODE  
$objProfileArray = QType::Cast($objProfileArray, QType::ArrayType);  
  
  
VULNERABLE VERSIONS  
===================  
All versions including 3.1.1 are affected.  
  
  
TESTED VERSIONS  
===============  
QCubed 3.1.1  
  
IMPACT  
======  
An unauthenticated attacker could execute code remotely.  
  
MITIGATION  
==========  
A patch was delivered by QCubed that allows to disable the profile-functionality.  
  
VENDOR CONTACT TIMELINE  
=======================   
  
| 2020-04-19 | Contacting the vendor |  
| 2020-04-19 | Vendor replied |  
| 2020-05-01 | Vendor released a patch at Github |  
| 2021-02-15 | Public disclosure |  
  
ADVISORY URL  
============  
  
[https://www.ait.ac.at/ait-sa-20210215-01-unauthenticated-remote-code-execution-qcubed](https://www.ait.ac.at/ait-sa-20210215-01-unauthenticated-remote-code-execution-qcubed)   
  
  
`