CVE-2024-13421: Real Estate 7 Privilege Escalation Flaw

CVE-2024-13421 Overview

The Real Estate 7 WordPress theme by Contempo Themes contains a critical privilege escalation vulnerability that allows unauthenticated attackers to register new administrative user accounts. This vulnerability exists because the theme fails to properly restrict which user roles can be selected during the registration process, enabling complete site takeover without requiring any authentication.

Critical Impact

Unauthenticated attackers can register administrator accounts, leading to complete WordPress site compromise, data theft, malware injection, and defacement.

Affected Products

• Contempothemes Real Estate 7 versions up to and including 3.5.1
• WordPress sites using vulnerable Real Estate 7 theme versions

Discovery Timeline

• 2025-02-12 - CVE CVE-2024-13421 published to NVD
• 2025-02-25 - Last updated in NVD database

Technical Details for CVE-2024-13421

Vulnerability Analysis

This privilege escalation vulnerability (CWE-266: Incorrect Privilege Assignment) stems from improper access control implementation in the user registration functionality of the Real Estate 7 WordPress theme. The theme provides custom registration forms that allow users to select their role during account creation, but fails to validate that the selected role is appropriate for self-registration.

WordPress core typically restricts user registration to default subscriber roles, with administrative privileges requiring explicit assignment by existing administrators. However, the Real Estate 7 theme bypasses this security model by accepting user-supplied role parameters without proper validation, allowing attackers to specify administrator-level roles during registration.

The attack requires no authentication and can be executed remotely over the network, making it particularly dangerous for publicly accessible WordPress installations using this theme.

Root Cause

The root cause is insufficient server-side validation of user-supplied role parameters during the registration process. The theme accepts role selections without verifying that the requested role is within the permitted set of roles for self-registration. This allows attackers to manipulate registration requests to include privileged roles such as administrator.

Attack Vector

The attack is network-based and can be executed by unauthenticated users. An attacker identifies a WordPress site running a vulnerable version of the Real Estate 7 theme, then submits a crafted registration request that includes an elevated role parameter. Upon successful registration, the attacker gains administrative access to the WordPress dashboard, enabling complete control over the site including content modification, plugin installation, user management, and database access.

The vulnerability is exploited through the theme's registration endpoint by manipulating the role parameter in the HTTP POST request. Once administrative access is obtained, attackers can install malicious plugins, inject backdoors, steal sensitive data, or use the compromised site as part of a larger attack infrastructure.

Detection Methods for CVE-2024-13421

Indicators of Compromise

• Unexpected administrator accounts appearing in WordPress user database
• New user registrations with administrator role from unknown IP addresses
• Modified WordPress files or unauthorized plugin installations
• Suspicious activity in WordPress audit logs around user registration events
• Unauthorized changes to site settings or content

Detection Strategies

• Monitor WordPress user database for new accounts with elevated privileges
• Implement web application firewall (WAF) rules to detect role manipulation in registration requests
• Review server access logs for unusual POST requests to registration endpoints
• Configure alerts for new administrator account creation events

Monitoring Recommendations

• Enable comprehensive WordPress activity logging using security plugins
• Monitor for POST requests containing role parameters in registration forms
• Set up alerts for any new user registrations with non-subscriber roles
• Regularly audit the WordPress user list for unauthorized administrative accounts

How to Mitigate CVE-2024-13421

Immediate Actions Required

• Update the Real Estate 7 WordPress theme to the latest patched version immediately
• Audit all existing WordPress user accounts and remove any unauthorized administrators
• Review recent site changes and revert any malicious modifications
• Change all administrator passwords and regenerate WordPress security keys
• Consider temporarily disabling user registration if immediate patching is not possible

Patch Information

Contempo Themes has addressed this vulnerability in versions after 3.5.1. Site administrators should update to the latest version of the Real Estate 7 theme available through ThemeForest or the Contempo Themes Changelog. The Wordfence Vulnerability Report provides additional details on the vulnerability and remediation.

Workarounds

• Disable WordPress user registration entirely via Settings > General if not required
• Implement server-side role validation using a custom plugin or code snippet
• Deploy a web application firewall with rules to block role manipulation attempts
• Use WordPress security plugins to monitor and restrict registration capabilities

# Disable user registration via wp-config.php
# Add this line to wp-config.php to disable registration
define('WP_ALLOW_REPAIR', false);

# Or disable via WordPress CLI
wp option update users_can_register 0