CVE-2020-35951: expresstech quiz and survey master

Vulnerability summary

CVE-2020-35951 is a critical (CVSS 9.9) vulnerability in expresstech quiz and survey master. EPSS estimates a 76.33% chance of exploitation in the next 30 days, higher than 99.5% of scored vulnerabilities. 2 public exploits are recorded. Fixed in 7.0.1.

Timeline

1. 01-01-2021
   PublishedVulnerability first disclosed.
2. 04-08-2024
   Last modifiedVulnerability information updated.

Description

An issue was discovered in the Quiz and Survey Master plugin before 7.0.1 for WordPress. It allows users to delete arbitrary files such as wp-config.php file, which could effectively take a site offline and allow an attacker to reinstall with a WordPress instance under their control. This occurred via qsm_remove_file_fd_question, which allowed unauthenticated deletions (even though it was only intended for a person to delete their own quiz-answer files).

• CWE-306Missing Authentication for Critical FunctionThe product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
• CWE-639Authorization Bypass Through User-Controlled KeyThe system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.