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)
