CVE-2024-31244: Bricksforge Auth Bypass Vulnerability

CVE-2024-31244 Overview

CVE-2024-31244 is a Missing Authorization vulnerability [CWE-862] affecting the Bricksforge plugin for WordPress. The flaw impacts all versions from initial release through 2.0.17. Unauthenticated attackers can modify arbitrary WordPress settings due to absent capability checks on sensitive plugin endpoints. The issue is exploitable over the network without user interaction or privileges, making it a remote integrity threat for any WordPress site running a vulnerable version of Bricksforge.

Critical Impact

Unauthenticated remote attackers can alter arbitrary WordPress settings, enabling site takeover paths such as changing the administrator email or enabling open user registration with elevated default roles.

Affected Products

• Bricksforge plugin for WordPress, all versions up to and including 2.0.17
• WordPress sites with Bricksforge installed and activated
• Hosting environments exposing WordPress admin-ajax or REST endpoints to the internet

Discovery Timeline

• 2024-06-09 - CVE-2024-31244 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2024-31244

Vulnerability Analysis

The Bricksforge plugin exposes functionality that modifies WordPress core settings without verifying the caller's authorization. The plugin registers handlers that accept setting changes but omits the current_user_can() capability check and a corresponding nonce verification. As a result, any unauthenticated HTTP request reaching the vulnerable endpoint is processed as if it came from a privileged user. This allows an attacker to overwrite settings stored in the wp_options table, including values that influence authentication, registration, and site identity.

Root Cause

The root cause is a Missing Authorization weakness [CWE-862]. The plugin's request handler for settings changes does not enforce access control before applying updates. Both the capability assertion and request origin validation are absent on the affected action, leaving privileged operations reachable by anonymous clients.

Attack Vector

Exploitation requires only network access to the WordPress site. The attacker sends a crafted POST request to the vulnerable Bricksforge handler with parameters that target WordPress option names. Because no privilege check or nonce is enforced, the plugin applies the change. An attacker can flip users_can_register to true and set default_role to administrator, then self-register as an administrator. See the Patchstack Vulnerability Advisory for endpoint specifics.

Detection Methods for CVE-2024-31244

Indicators of Compromise

• Unexpected changes to WordPress options such as users_can_register, default_role, admin_email, siteurl, or home
• New administrator accounts created shortly after anonymous POST traffic to Bricksforge plugin endpoints
• HTTP POST requests to admin-ajax.php or plugin REST routes referencing Bricksforge actions from non-authenticated sessions

Detection Strategies

• Review WordPress audit logs for setting modifications without a corresponding authenticated administrator session
• Inspect web server access logs for POST requests targeting Bricksforge action handlers originating from external IPs without prior login activity
• Compare current wp_options values against a known-good baseline to detect unauthorized changes

Monitoring Recommendations

• Alert on creation of new users with the administrator role outside change windows
• Monitor outbound email configuration changes and password reset volume for signs of email hijack
• Track plugin version inventory and flag any WordPress instance still running Bricksforge <= 2.0.17

How to Mitigate CVE-2024-31244

Immediate Actions Required

• Update the Bricksforge plugin to a version later than 2.0.17 on all WordPress sites
• Audit wp_options values, administrator accounts, and recent user registrations for unauthorized changes
• Rotate administrator credentials and force a password reset if tampering is suspected

Patch Information

The vendor has released a fixed version that introduces proper authorization checks on the affected handlers. Refer to the Patchstack Vulnerability Advisory for the fixed release information and update via the WordPress plugin dashboard.

Workarounds

• Deactivate and remove the Bricksforge plugin until patching is possible
• Restrict access to wp-admin/admin-ajax.php and plugin REST routes via a web application firewall rule that blocks unauthenticated setting-change parameters
• Set DISALLOW_FILE_MODS and enforce least-privilege configurations to limit post-exploitation impact

# Configuration example: WordPress hardening in wp-config.php
define('DISALLOW_FILE_MODS', true);
define('DISALLOW_FILE_EDIT', true);

# Verify users_can_register is disabled unless required
wp option get users_can_register
wp option update users_can_register 0
wp option update default_role subscriber