CVE-2024-50483: Meetup Privilege Escalation Vulnerability

CVE-2024-50483 Overview

CVE-2024-50483 is an Authorization Bypass Through User-Controlled Key vulnerability affecting the Meetup WordPress plugin developed by Tareqhasan. This broken authentication flaw allows attackers to bypass authorization controls and escalate privileges within affected WordPress installations. The vulnerability stems from improper validation of user-controlled keys, enabling unauthorized access to protected functionality.

Critical Impact

This vulnerability enables unauthenticated attackers to bypass authentication mechanisms and gain elevated privileges on WordPress sites running the affected Meetup plugin, potentially leading to complete site compromise.

Affected Products

• Tareqhasan Meetup WordPress plugin version 0.1 and earlier
• WordPress installations with the Meetup plugin installed
• All configurations of the Meetup plugin from n/a through version 0.1

Discovery Timeline

• 2024-10-28 - CVE-2024-50483 published to NVD
• 2024-10-31 - Last updated in NVD database

Technical Details for CVE-2024-50483

Vulnerability Analysis

This vulnerability is classified as CWE-639: Authorization Bypass Through User-Controlled Key. The flaw exists because the Meetup plugin fails to properly validate user-supplied keys that control authorization decisions. When an application uses user-controlled input to make authorization decisions without proper validation, attackers can manipulate these values to gain unauthorized access to resources or functionality intended for other users or privilege levels.

The broken authentication nature of this vulnerability means that authentication checks can be circumvented entirely, allowing unauthenticated remote attackers to escalate their privileges within the WordPress application context.

Root Cause

The root cause of CVE-2024-50483 lies in the improper implementation of access control mechanisms within the Meetup plugin. The application relies on user-controllable parameters to determine authorization levels without implementing adequate server-side validation. This design flaw allows attackers to forge or manipulate authentication tokens, user identifiers, or session parameters to impersonate legitimate users or gain administrative access.

The lack of proper server-side verification of user identity and privilege levels before granting access to protected resources creates a direct pathway for privilege escalation attacks.

Attack Vector

The attack vector is network-based, requiring no prior authentication or user interaction. An attacker can exploit this vulnerability remotely by crafting malicious requests that manipulate the user-controlled key parameters. The exploitation process typically involves:

1. Identifying the vulnerable authentication mechanism in the Meetup plugin
2. Analyzing how user keys are processed and validated
3. Crafting requests with manipulated key values to bypass authorization checks
4. Gaining elevated privileges or accessing protected functionality

Due to the nature of this broken authentication vulnerability, attackers can exploit it without requiring any privileges or credentials on the target system. For detailed technical information about this vulnerability, refer to the Patchstack Vulnerability Advisory.

Detection Methods for CVE-2024-50483

Indicators of Compromise

• Unusual authentication attempts or session creation patterns in WordPress logs
• Unexpected privilege changes for user accounts within the Meetup plugin
• Access to administrative functions by non-administrative users
• Anomalous HTTP requests targeting Meetup plugin endpoints with manipulated parameters

Detection Strategies

• Monitor WordPress access logs for requests to Meetup plugin endpoints with suspicious parameter values
• Implement Web Application Firewall (WAF) rules to detect authorization bypass attempts
• Review authentication logs for failed or anomalous authentication patterns
• Deploy file integrity monitoring to detect unauthorized changes to WordPress files

Monitoring Recommendations

• Enable verbose logging for WordPress authentication events
• Configure alerts for privilege escalation activities within the WordPress admin panel
• Monitor for bulk access to resources that should require authentication
• Implement real-time alerting for suspicious activity patterns targeting plugin endpoints

How to Mitigate CVE-2024-50483

Immediate Actions Required

• Deactivate and remove the Meetup plugin from all WordPress installations immediately
• Audit user accounts and privileges for any unauthorized changes
• Review WordPress access logs for signs of exploitation
• Consider implementing additional WordPress security hardening measures

Patch Information

As of the last update on 2024-10-31, no official patch has been released for this vulnerability. The affected Meetup plugin version 0.1 and all prior versions remain vulnerable. Site administrators should remove the plugin entirely until a patched version becomes available from the vendor.

Workarounds

• Remove the Meetup plugin from WordPress installations until a security patch is available
• Implement Web Application Firewall (WAF) rules to block suspicious requests targeting the plugin
• Restrict access to WordPress admin areas through IP whitelisting where possible
• Enable WordPress security plugins that provide additional authentication protection

# WordPress CLI command to deactivate the vulnerable plugin
wp plugin deactivate meetup --path=/var/www/html/wordpress

# Remove the plugin entirely
wp plugin delete meetup --path=/var/www/html/wordpress

# List all installed plugins to verify removal
wp plugin list --path=/var/www/html/wordpress