CVE-2024-37277: Paid Memberships Pro Auth Bypass Flaw

CVE-2024-37277 Overview

CVE-2024-37277 is an Authorization Bypass Through User-Controlled Key vulnerability (CWE-639) affecting the Paid Memberships Pro plugin for WordPress. This Insecure Direct Object Reference (IDOR) vulnerability allows attackers to access functionality not properly constrained by Access Control Lists (ACLs), potentially enabling unauthorized access to protected membership content and user data.

Critical Impact

This vulnerability allows unauthenticated attackers to bypass authorization controls and access restricted membership functionality, potentially exposing sensitive user data and premium content without proper authentication.

Affected Products

• Paid Memberships Pro versions from n/a through 3.0.4
• WordPress installations with strangerstudios paid_memberships_pro plugin
• Sites using the vulnerable plugin for membership management and access control

Discovery Timeline

• November 1, 2024 - CVE-2024-37277 published to NVD
• January 22, 2025 - Last updated in NVD database

Technical Details for CVE-2024-37277

Vulnerability Analysis

This vulnerability stems from improper authorization controls within the Paid Memberships Pro plugin. The flaw allows attackers to manipulate user-controlled keys to bypass access restrictions that should be enforced by the plugin's ACL mechanisms. The vulnerability is network-exploitable, requires no authentication or user interaction, and can result in unauthorized access to confidential membership data, manipulation of membership records, and potential disruption of service availability.

The weakness classified as CWE-639 (Authorization Bypass Through User-Controlled Key) indicates that the application uses user-supplied input to determine which resources or operations are accessible, without properly validating whether the user is authorized to access those specific resources.

Root Cause

The root cause of CVE-2024-37277 lies in insufficient validation of user-controlled parameters when determining access permissions. The Paid Memberships Pro plugin fails to properly verify that a user requesting access to a specific resource is actually authorized to view or modify that resource. Instead, the plugin relies on user-controllable identifiers without implementing proper server-side authorization checks, creating an Insecure Direct Object Reference (IDOR) condition.

Attack Vector

An attacker can exploit this vulnerability remotely over the network without requiring any authentication or privileges. The attack involves manipulating request parameters that reference membership objects, user accounts, or restricted content. By modifying these identifiers, an attacker can access resources belonging to other users or access premium content without a valid membership.

The attack does not require user interaction and can be automated, making it particularly dangerous for WordPress sites relying on Paid Memberships Pro for content protection or user access management. For detailed technical information about this vulnerability, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2024-37277

Indicators of Compromise

• Unusual access patterns to membership-protected content from unauthenticated users
• Unexpected parameter manipulation in requests targeting membership-related endpoints
• Access logs showing sequential enumeration of user IDs or membership IDs
• Unauthorized viewing or modification of membership records without corresponding authentication events

Detection Strategies

• Monitor web application logs for suspicious parameter tampering in Paid Memberships Pro endpoints
• Implement Web Application Firewall (WAF) rules to detect IDOR attack patterns
• Review access logs for anomalous requests to membership content from unauthenticated sessions
• Deploy runtime application security monitoring to detect authorization bypass attempts

Monitoring Recommendations

• Enable detailed logging for all Paid Memberships Pro plugin activities
• Configure alerts for access to protected content without valid membership authentication
• Monitor for bulk enumeration attempts against membership-related API endpoints
• Implement anomaly detection for unusual patterns in membership data access

How to Mitigate CVE-2024-37277

Immediate Actions Required

• Update Paid Memberships Pro to a version higher than 3.0.4 immediately
• Audit access logs for potential exploitation attempts prior to patching
• Review membership records for any unauthorized modifications
• Implement additional server-side authorization checks as a defense-in-depth measure

Patch Information

Organizations should update the Paid Memberships Pro plugin to the latest available version that addresses this vulnerability. The fix should include proper server-side authorization validation to ensure users can only access resources they are explicitly permitted to view or modify. Check the WordPress plugin repository for the latest secure version and review the Patchstack Vulnerability Report for additional remediation guidance.

Workarounds

• Implement Web Application Firewall (WAF) rules to filter suspicious parameter manipulation attempts
• Add additional authorization middleware to validate user permissions before granting access to membership resources
• Temporarily restrict access to sensitive membership functionality until the patch is applied
• Consider enabling WordPress maintenance mode for high-value sites until the update is complete

# WordPress plugin update via WP-CLI
wp plugin update paid-memberships-pro --allow-root

# Verify the installed version after update
wp plugin list --name=paid-memberships-pro --format=table