CVE-2020-11511 in LearnPress Plugin
Summary
by MITRE • 07/30/2021
The LearnPress plugin before 3.2.6.9 for WordPress allows remote attackers to escalate the privileges of any user to LP Instructor via the accept-to-be-teacher action parameter.
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Analysis
by VulDB Data Team • 08/06/2021
The vulnerability identified as CVE-2020-11511 affects the LearnPress plugin version 3.2.6.8 and earlier, representing a critical privilege escalation flaw within the WordPress ecosystem. This vulnerability specifically targets the plugin's handling of user role assignments, creating a pathway for remote attackers to elevate user permissions without proper authentication or authorization. The issue stems from insufficient input validation and access control mechanisms within the plugin's core functionality, particularly in how it processes the accept-to-be-teacher action parameter.
The technical flaw manifests in the plugin's improper validation of user input when processing requests to grant instructor privileges. Attackers can exploit this by crafting malicious requests that manipulate the action parameter to bypass normal user registration and approval workflows. This vulnerability falls under the category of improper access control as defined by CWE-285, where the system fails to properly enforce authorization checks before allowing privilege escalation. The flaw enables attackers to manipulate the plugin's internal user role management system, effectively allowing any authenticated user to assume the LP Instructor role regardless of their original permissions or the normal approval processes that should govern such role assignments.
The operational impact of this vulnerability is significant as it can lead to unauthorized access to course management features, student data, and administrative functions within the LearnPress plugin. Once an attacker achieves instructor privileges, they gain access to course creation, modification, and deletion capabilities, along with the ability to view and manipulate student progress and grades. This represents a substantial security risk for educational institutions and organizations relying on WordPress for their learning management systems. The vulnerability can be exploited remotely without requiring any special privileges, making it particularly dangerous as it allows attackers to compromise the entire learning environment through a single exploitation vector.
Mitigation strategies should focus on immediate plugin updates to version 3.2.6.9 or later, which contains the necessary patches to address the privilege escalation vulnerability. Organizations should also implement additional security measures such as monitoring for unauthorized role changes, implementing network segmentation to limit access to WordPress installations, and conducting regular security audits of installed plugins. The vulnerability demonstrates the importance of proper input validation and access control mechanisms as outlined in the OWASP Top Ten security principles. Security teams should also consider implementing web application firewalls to detect and block suspicious parameter manipulation attempts, and establish incident response procedures to quickly address potential exploitation attempts. This vulnerability underscores the critical need for regular security updates and the importance of maintaining secure coding practices in plugin development to prevent unauthorized privilege escalation attacks.