CVE-2024-30538: Delucks SEO Auth Bypass Vulnerability

CVE-2024-30538 Overview

CVE-2024-30538 is a Missing Authorization vulnerability affecting the DELUCKS SEO plugin for WordPress developed by DELUCKS GmbH. This Broken Access Control flaw allows unauthorized users to bypass security restrictions and access protected functionality without proper authentication or permission checks. The vulnerability impacts all versions of the DELUCKS SEO plugin from the initial release through version 2.5.4.

Critical Impact

This Missing Authorization vulnerability allows attackers to bypass access controls and potentially compromise WordPress sites running the vulnerable DELUCKS SEO plugin, with severe implications for site confidentiality, integrity, and availability.

Affected Products

• DELUCKS SEO plugin for WordPress versions through 2.5.4
• WordPress installations utilizing the DELUCKS SEO plugin
• Sites using delucks:delucks_seo component

Discovery Timeline

• 2024-06-09 - CVE-2024-30538 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2024-30538

Vulnerability Analysis

This vulnerability is classified as CWE-862 (Missing Authorization), a critical security flaw where the application fails to perform proper authorization checks before allowing users to access restricted functionality or resources. In the context of the DELUCKS SEO WordPress plugin, this means that certain privileged operations can be performed by users who should not have permission to execute them.

The vulnerability exists in the plugin's request handling logic, where authorization verification is either absent or improperly implemented. This allows attackers to interact with protected plugin endpoints without having the necessary user roles or capabilities typically required by WordPress's permission system.

Root Cause

The root cause of this vulnerability stems from missing authorization checks within the DELUCKS SEO plugin's code paths. WordPress plugins are expected to verify user capabilities using functions like current_user_can() before executing privileged operations. When these checks are omitted, any authenticated or potentially unauthenticated user can invoke restricted functionality.

The vulnerability allows network-based exploitation without requiring any privileges or user interaction, making it particularly dangerous in production environments. An attacker can remotely target vulnerable WordPress installations to manipulate SEO settings, access sensitive configuration data, or potentially escalate their attack to achieve broader site compromise.

Attack Vector

The attack vector for CVE-2024-30538 is network-based, allowing remote exploitation. Attackers can send crafted HTTP requests to the vulnerable plugin endpoints to bypass authorization controls. Since the vulnerability requires no special privileges or user interaction, it presents a low barrier to exploitation.

A typical attack scenario involves an attacker identifying a WordPress site running a vulnerable version of the DELUCKS SEO plugin, then sending requests directly to plugin endpoints that lack proper capability checks. This could allow manipulation of SEO metadata, access to configuration settings, or other unauthorized actions depending on the specific functionality exposed.

For detailed technical analysis and proof-of-concept information, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2024-30538

Indicators of Compromise

• Unexpected modifications to SEO settings or metadata without administrator actions
• Unusual HTTP requests to DELUCKS SEO plugin endpoints from unauthorized sources
• Audit logs showing plugin functionality accessed by users without appropriate WordPress roles
• Changes to site configuration or settings associated with the SEO plugin

Detection Strategies

• Monitor WordPress audit logs for unauthorized access attempts to DELUCKS SEO plugin endpoints
• Implement web application firewall (WAF) rules to detect and block suspicious requests targeting plugin functionality
• Review server access logs for unusual patterns of requests to /wp-content/plugins/delucks-seo/ paths
• Deploy intrusion detection signatures for known Broken Access Control attack patterns

Monitoring Recommendations

• Enable comprehensive WordPress activity logging to track plugin interactions
• Configure alerts for any changes to SEO settings made outside of normal administrative workflows
• Regularly audit user access patterns and flag anomalous behavior related to plugin endpoints
• Utilize SentinelOne's Singularity platform for real-time endpoint monitoring and threat detection

How to Mitigate CVE-2024-30538

Immediate Actions Required

• Update the DELUCKS SEO plugin to a version newer than 2.5.4 if a patched version is available
• Review WordPress audit logs for any signs of unauthorized access or configuration changes
• Temporarily disable the DELUCKS SEO plugin if no patch is available and the site is at risk
• Implement WAF rules to restrict access to vulnerable plugin endpoints

Patch Information

Organizations using the DELUCKS SEO plugin should check for updates through the WordPress plugin repository or contact DELUCKS GmbH directly for security patches. Monitor the Patchstack Vulnerability Report for updated remediation guidance.

Workarounds

• Restrict access to the WordPress admin area using IP allowlisting at the network or server level
• Implement additional authentication layers (such as HTTP Basic Auth) for wp-admin and plugin directories
• Consider using a WordPress security plugin that provides capability-based access control enforcement
• Limit plugin functionality exposure by placing the site behind a WAF with strict rule sets

# Example: Restrict access to DELUCKS SEO plugin directory via .htaccess
<Directory /var/www/html/wp-content/plugins/delucks-seo>
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
</Directory>