CVE-2024-37094: Masterstudy LMS Auth Bypass Vulnerability

CVE-2024-37094 Overview

CVE-2024-37094 is a Missing Authorization vulnerability affecting the StylemixThemes MasterStudy LMS plugin for WordPress. This security flaw allows attackers to exploit incorrectly configured access control security levels, potentially enabling unauthorized access to restricted functionality and sensitive data within the learning management system.

The vulnerability stems from broken access control mechanisms that fail to properly verify user authorization before granting access to protected resources or administrative functions.

Critical Impact

Unauthenticated attackers can exploit this vulnerability remotely to bypass access controls, potentially leading to complete compromise of the affected WordPress installation including unauthorized data access, modification, and system disruption.

Affected Products

• StylemixThemes MasterStudy LMS plugin for WordPress versions up to and including 3.2.12
• WordPress installations utilizing the MasterStudy LMS plugin within the affected version range
• Learning management systems built on the MasterStudy LMS platform

Discovery Timeline

• 2024-11-01 - CVE-2024-37094 published to NVD
• 2025-01-22 - Last updated in NVD database

Technical Details for CVE-2024-37094

Vulnerability Analysis

This vulnerability is classified as CWE-862 (Missing Authorization), which occurs when the software does not perform an authorization check when an actor attempts to access a resource or perform an action. In the context of MasterStudy LMS, certain plugin endpoints or functionality lack proper permission verification, allowing unauthorized users to invoke restricted operations.

The attack can be executed remotely over the network without requiring any prior authentication or user interaction. The potential impact encompasses complete compromise of confidentiality, integrity, and availability of the affected system.

Root Cause

The root cause of CVE-2024-37094 lies in the absence of proper authorization checks within the MasterStudy LMS plugin codebase. Specifically, certain AJAX handlers, REST API endpoints, or administrative functions do not adequately verify that the requesting user has the appropriate capabilities or roles before processing the request.

WordPress plugins typically should leverage the current_user_can() function or similar capability checks to enforce authorization. When these checks are missing or improperly implemented, attackers can directly invoke privileged functionality by crafting requests to the vulnerable endpoints.

Attack Vector

The attack vector for this vulnerability is network-based, meaning it can be exploited remotely by any attacker who can send HTTP requests to the vulnerable WordPress installation. The exploitation requires low complexity and no special privileges or user interaction.

An attacker would typically:

1. Identify a WordPress site running a vulnerable version of MasterStudy LMS
2. Craft malicious HTTP requests targeting the unprotected endpoints
3. Send requests directly to the vulnerable functionality without authentication
4. Gain unauthorized access to restricted features, sensitive data, or administrative capabilities

The vulnerability mechanism involves bypassing access control checks that should restrict certain operations to authenticated and authorized users. For detailed technical analysis, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2024-37094

Indicators of Compromise

• Unusual HTTP requests to MasterStudy LMS AJAX handlers or REST API endpoints from unauthenticated sources
• Unexpected modifications to LMS course content, user enrollments, or plugin settings
• Access log entries showing requests to /wp-admin/admin-ajax.php with MasterStudy-specific action parameters from external IPs
• Creation of unauthorized user accounts or elevation of existing user privileges

Detection Strategies

• Review web server access logs for suspicious POST requests targeting MasterStudy LMS endpoints without valid authentication cookies
• Implement Web Application Firewall (WAF) rules to detect and block requests attempting to access administrative functions without proper session tokens
• Monitor WordPress database for unauthorized changes to LMS-related tables including course enrollments, user metadata, and plugin options
• Deploy file integrity monitoring to detect unauthorized modifications to plugin files

Monitoring Recommendations

• Enable verbose logging for WordPress AJAX and REST API requests to capture detailed request parameters
• Configure alerting for failed authorization attempts or access denied events within the LMS plugin
• Implement real-time monitoring of user privilege changes and administrative actions within the WordPress installation
• Utilize SentinelOne Singularity Platform to monitor for suspicious process behavior and network activity on web servers hosting affected WordPress installations

How to Mitigate CVE-2024-37094

Immediate Actions Required

• Update MasterStudy LMS plugin to a version newer than 3.2.12 immediately
• Audit WordPress user accounts for unauthorized modifications or suspicious new accounts
• Review and verify course enrollments and LMS content for unauthorized changes
• Implement additional access controls at the web server or WAF level while patching

Patch Information

The vulnerability affects MasterStudy LMS versions from the initial release through 3.2.12. Site administrators should update to the latest available version of the plugin through the WordPress admin dashboard or by manually downloading and installing the updated package from the official WordPress plugin repository.

For additional patch details and remediation guidance, consult the Patchstack Vulnerability Report.

Workarounds

• Temporarily disable the MasterStudy LMS plugin if immediate patching is not feasible
• Implement IP-based access restrictions for WordPress administrative endpoints
• Configure a Web Application Firewall to block unauthenticated requests to vulnerable plugin endpoints
• Enforce additional authentication requirements at the server level for access to /wp-admin/ and AJAX handlers

# Apache .htaccess configuration to restrict admin access
<Files admin-ajax.php>
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
    # Add trusted IP ranges as needed
</Files>