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Thursday, January 21, 2021

Critical vulnerabilities in Quiz And Survey Master WordPress Plugin

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Quiz and Survey Master is a WordPress plugin for creating quizzes and surveys easily on WordPress sites. It is installed on over 30,000+ websites.

Recently WordFence‘s Chloe Chamberland discovered two critical vulnerabilities in Quiz and Survey Master plugin version 7.0.

Vulnerability Danger level Exploitation
Arbitrary file upload Critical Easy to exploit
Arbitrary file delete Critical Easy to exploit

Arbitrary File Upload

The first vulnerability is the Arbitrary file upload vulnerability. Exploiting this vulnerability can allow an attacker to upload an arbitrary PHP file. After that, the script can be run and it can perform any action on the site.

Arbitrary file upload vulnerability can be exploited by an unauthenticated user that means even if the site that has the vulnerable plugin installed has turned off site registrations, the attacker can exploit this vulnerability without any user capabilities.

Unauthenticated Arbitrary File Deletion

The second vulnerability is also a critical vulnerability that can allow an attacker to delete any arbitrary file from the site. An attacker can exploit this vulnerability without any user capabilities. Both these vulnerabilities can allow an attacker to take over the entire website and the hosting.

The plugin is installed on over 30,000+ websites. Developers have released the patched version which is 7.0.1. All the users of Quiz and Survey Master plugin are recommended to update the plugin immediately.

Proof of Concept

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