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)
This vulnerability was discovered and researched by Julien Ahrens from
3. VERSIONS AFFECTED
Quiz And Survey Master 8.0.8 and below
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
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
Accept-Encoding: gzip, deflate
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
Mit freundlichen Grüßen / With best regards / Atentamente
Freelancer | Penetration Tester
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