Insecure Direct Object Reference in PressPrimer Quiz WordPress Plugin

Executive Summary

The vulnerability in the PressPrimer Quiz plugin for WordPress is an Insecure Direct Object Reference (IDOR) issue affecting all versions up to and including 2.3.0. It occurs because the plugin does not properly validate the 'rule_id' parameter, which is controlled by the user. This flaw allows authenticated users with custom-level access or higher to modify or delete quiz rules that belong to other teachers, enabling unauthorized changes to another user's quiz structure.

Useful 0 Not Useful 0

Impact Analysis

This vulnerability can impact you by allowing attackers with certain access privileges to tamper with quiz rules that do not belong to them. Specifically, an attacker could modify or delete quiz rules created by other teachers, potentially disrupting the integrity and reliability of quizzes. This unauthorized tampering could lead to incorrect quiz behavior, loss of data, or unfair assessment conditions.

Useful 0 Not Useful 0

Mitigation Strategies

To mitigate this vulnerability, you should update the PressPrimer Quiz plugin to version 2.3.1 or later.

The update introduces stricter ownership enforcement for quiz items and rules, ensuring that only the owner of a quiz or users with the appropriate capability can access or modify quiz content.

This prevents authenticated attackers with custom-level access from tampering with quiz rules belonging to other users.

Useful 0 Not Useful 0

Compliance Impact

The vulnerability allows authenticated attackers with custom-level access to modify or delete quiz rules belonging to other teachers, resulting in unauthorized tampering of another user's quiz structure.

Such unauthorized access and modification of user data could potentially lead to non-compliance with data protection regulations like GDPR or HIPAA, which require strict controls over access to and integrity of personal and sensitive data.

However, the provided information does not explicitly mention any direct impact or assessment related to compliance with these standards.

Useful 0 Not Useful 0

Detection Guidance

This vulnerability involves an Insecure Direct Object Reference (IDOR) via the 'rule_id' parameter in the PressPrimer Quiz plugin for WordPress, allowing authenticated users with custom-level access or higher to modify or delete quiz rules belonging to other users.

To detect exploitation attempts on your system or network, you should monitor HTTP requests to the plugin's REST API endpoints that handle quiz rules, especially those containing the 'rule_id' parameter.

Suggested commands include using web server access logs or network traffic inspection tools to filter requests with suspicious 'rule_id' parameters or unauthorized modifications. For example:

• Using grep on web server logs to find requests with 'rule_id': grep -i 'rule_id=' /var/log/apache2/access.log
• Using curl to test access control by attempting to modify a quiz rule with a different 'rule_id': curl -X POST -d 'rule_id=some_other_user_rule' -b cookies.txt https://yourwordpresssite.com/wp-json/pressprimer/v1/quiz/rule/update
• Using a web application firewall (WAF) or intrusion detection system (IDS) to alert on unauthorized access attempts to quiz rule endpoints.

Note that the vulnerability requires authenticated access with custom-level permissions or higher, so monitoring authenticated user actions on these endpoints is critical.

Useful 0 Not Useful 0