CVE-2024-8428 in ForumWP Plugin
Summary
by MITRE • 09/06/2024
The ForumWP – Forum & Discussion Board Plugin plugin for WordPress is vulnerable to Privilege Escalation via Insecure Direct Object Reference in all versions up to, and including, 2.0.2 via the submit_form_handler due to missing validation on the 'user_id' user controlled key. This makes it possible for authenticated attackers, with subscriber-level access and above, to change the email address of administrative user accounts which can then be leveraged to reset the administrative users password and gain access to their account.
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Analysis
by VulDB Data Team • 09/27/2024
The vulnerability identified as CVE-2024-8428 affects the ForumWP – Forum & Discussion Board Plugin for WordPress, a widely used community management tool that enables users to create and manage online discussion forums. This particular flaw represents a critical security weakness that undermines the plugin's access control mechanisms and could lead to complete administrative compromise of affected WordPress installations. The vulnerability exists in all versions up to and including 2.0.2, making it a persistent threat across a significant portion of the plugin's user base. The issue stems from insufficient input validation within the plugin's core functionality, specifically in how user identifiers are handled during form submissions, creating an avenue for unauthorized privilege escalation.
The technical flaw manifests through an insecure direct object reference vulnerability that occurs within the submit_form_handler function of the plugin. This vulnerability specifically targets the 'user_id' parameter which is directly influenced by user input without proper validation or authorization checks. When authenticated users submit forms through the plugin interface, the system fails to verify whether the requesting user has legitimate authorization to modify the target user account identified by the user_id parameter. This oversight allows attackers with subscriber-level permissions or higher to manipulate the user_id value and target administrative accounts. The vulnerability aligns with CWE-639 which describes Insecure Direct Object Reference vulnerabilities where applications fail to verify that the user has proper authorization to access specific objects or resources. The flaw essentially permits attackers to bypass normal access controls by directly referencing objects they should not be able to modify.
The operational impact of this vulnerability is severe and far-reaching for WordPress administrators and site owners. An authenticated attacker with subscriber privileges can exploit this weakness to change the email addresses of administrative user accounts within the forum plugin's user management system. This email address modification capability becomes a critical attack vector because it enables password reset attacks against administrative accounts. Once an attacker has control over an administrator's email address, they can leverage the standard WordPress password reset functionality to gain full administrative access to the site. This compromise allows for complete control over the WordPress installation, including the ability to modify content, install malicious plugins, alter user permissions, and potentially exfiltrate sensitive data. The attack chain demonstrates the dangerous escalation potential from a low-privilege user position to full administrative control, making it particularly concerning for sites with multiple user roles and sensitive data.
Mitigation strategies for CVE-2024-8428 should focus on immediate remediation and ongoing security monitoring. The most effective immediate solution is to upgrade to the patched version of the ForumWP plugin, which should include proper validation and authorization checks for user_id parameters. Administrators should also implement network-level monitoring to detect unusual patterns in user account modifications and email address changes, particularly those occurring from unexpected IP addresses or during non-standard access hours. Security teams should conduct thorough access reviews to identify any unauthorized modifications that may have already occurred and consider implementing additional authentication controls such as two-factor authentication for administrative accounts. The vulnerability demonstrates the importance of proper input validation and access control mechanisms, principles that align with the ATT&CK framework's defense-in-depth strategies for preventing privilege escalation attacks. Organizations should also consider implementing web application firewalls and regular security audits to detect similar vulnerabilities in other plugins and themes that may exhibit similar insecure object reference patterns.