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RCE Security Advisory  
https://www.rcesecurity.com  
  
  
1. ADVISORY INFORMATION  
=======================  
Product: SlickQuiz  
Vendor URL: https://wordpress.org/plugins/slickquiz/  
Type: SQL Injection [CWE-74]  
Date found: 2019-05-30  
Date published: 2019-09-10  
CVSSv3 Score: 8.1 (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N)  
CVE: CVE-2019-12516  
  
  
2. CREDITS  
==========  
This vulnerability was discovered and researched by Julien Ahrens from  
RCE Security.  
  
  
3. VERSIONS AFFECTED  
====================  
SlickQuiz for Wordpress 1.3.7.1 (latest)  
  
  
4. INTRODUCTION  
===============  
SlickQuiz is a plugin for displaying and managing pretty, dynamic quizzes. It  
uses the SlickQuiz jQuery plugin.  
  
(from the vendor's homepage)  
  
  
5. VULNERABILITY DETAILS  
========================  
The SlickQuiz Wordpress plugin is vulnerable to multiple authenticated SQL  
Injections whenever the "id" parameter is involved. It is not even required to  
have any quiz created, just the pure presence of the plugin makes the  
installation vulnerable.  
  
Since all access levels from Subscriber (the lowest possible rights) to Admin  
basically have access to the plugin, it is possible to escalate privileges quite easily.  
  
To name just a few vulnerable endpoints:  
  
/wp-admin/admin.php?page=slickquiz-scores&id=(select*from(select(sleep(5)))a)  
/wp-admin/admin.php?page=slickquiz-edit&id=(select*from(select(sleep(5)))a)  
/wp-admin/admin.php?page=slickquiz-preview&id=(select*from(select(sleep(5)))a)  
  
  
6. RISK  
=======  
The vulnerability can be used by an authenticated attacker (lowest possible  
rights of Subscriber are sufficient) to read sensitive contents from the backend  
database and therefore compromise all kinds of information, which is stored in  
the database. This could be sensitive authentication information like passwords  
or customer and employee information like email addresses and could also be used  
to escalate privileges to Admin which in return leads to RCE on the Wordpress  
installation via the plugin functionality.  
  
  
7. SOLUTION  
===========  
None (Remove the plugin)  
  
  
8. REPORT TIMELINE  
==================  
2019-05-30: Discovery of the vulnerability during H1-4420  
2019-06-01: CVE requested from MITRE  
2019-06-02: MITRE assigns CVE-2019-12516  
2019-06-10: Contacted vendor using their publicly listed email address  
2019-06-19: Contacted vendor using their publicly listed email address  
2019-06-22: Contacted vendor using their publicly listed email address  
2019-08-28: No response from vendor  
2019-09-10: Public disclosure.  
  
  
9. REFERENCES  
=============  
https://www.rcesecurity.com/2019/09/H1-4420-From-Quiz-to-Admin-Chaining-Two-0-Days-to-Compromise-an-Uber-Wordpress/