CVE-2021-24583 : Security Advisory and Response

The Timetable and Event Schedule WordPress plugin before version 2.4.2 allows unauthorized deletion of event timeslots, posing a security risk for all users with certain capabilities.

Understanding CVE-2021-24583

This CVE highlights a vulnerability in the Timetable and Event Schedule plugin that enables users with specific capabilities to delete event timeslots without proper access control.

What is CVE-2021-24583?

The Timetable and Event Schedule plugin, prior to version 2.4.2, lacks proper access control mechanisms when deleting timeslots. This flaw allows users with edit_posts capabilities or higher to delete arbitrary timeslots from any events. Additionally, the absence of a Cross-Site Request Forgery (CSRF) check permits attacks via CSRF against logged-in users with such capabilities.

The Impact of CVE-2021-24583

This vulnerability could be exploited by contributors and higher-level users to delete important event timeslots, potentially disrupting schedules and causing data loss. Moreover, attackers could utilize CSRF attacks to manipulate the plugin through authorized users, leading to further security breaches.

Technical Details of CVE-2021-24583

The following points detail the technical aspects of CVE-2021-24583:

Vulnerability Description

The vulnerability in the Timetable and Event Schedule plugin allows users with edit_posts capabilities to delete event timeslots without proper access control or CSRF protection.

Affected Systems and Versions

The issue impacts versions of the plugin prior to 2.4.2.

Exploitation Mechanism

Attackers can exploit this vulnerability by leveraging the lack of proper access control to delete event timeslots or by performing CSRF attacks against authorized users with edit_posts capabilities.

Mitigation and Prevention

To secure your system from CVE-2021-24583, consider the following mitigation strategies:

Immediate Steps to Take

Update the Timetable and Event Schedule plugin to version 2.4.2 or higher.
Limit user roles and capabilities to ensure only authorized personnel can manage event timeslots.

Long-Term Security Practices

Regularly monitor security advisories and update your plugins promptly.
Educate users on the risks of CSRF attacks and the importance of access control in maintaining system security.

Patching and Updates

Apply security patches and plugin updates as soon as they are released to address known vulnerabilities and enhance the overall security posture of your WordPress site.