CVE-2024-6465 in WP Links Page
Summary
by MITRE • 07/13/2024
The WP Links Page plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the 'wplf_ajax_update_screenshots' function in all versions up to, and including, 4.9.5. This makes it possible for authenticated attackers, with Subscriber-level access and above, to regenerate the link's thumbnail image.
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Analysis
by VulDB Data Team • 07/15/2024
The WP Links Page plugin for WordPress presents a critical security vulnerability that undermines the integrity of link management functionality through a deliberate absence of access control verification. This flaw exists within the 'wplf_ajax_update_screenshots' function, which is designed to handle asynchronous updates to link thumbnails but fails to validate user permissions before executing sensitive operations. The vulnerability affects all plugin versions up to and including 4.9.5, creating a persistent risk for WordPress installations that rely on this particular plugin for managing external links and their associated visual representations.
The technical implementation of this vulnerability stems from the plugin's failure to implement proper capability checks before allowing modification operations to proceed. When an authenticated user with subscriber-level privileges or higher accesses the vulnerable function through an AJAX request, the system processes the thumbnail regeneration without verifying whether the user possesses the necessary permissions to modify link data. This missing authorization check creates a privilege escalation scenario where users who should only have read-only access can manipulate link metadata through the regeneration of thumbnail images. The vulnerability operates at the application layer and leverages the existing WordPress user authentication system to exploit a logic flaw in the plugin's permission handling mechanisms.
The operational impact of this vulnerability extends beyond simple thumbnail manipulation to potentially compromise the integrity of link management systems within WordPress environments. Attackers with subscriber-level access can exploit this weakness to modify link representations, potentially redirecting users to malicious destinations or altering the visual presentation of legitimate links. This capability could be particularly dangerous in collaborative environments where multiple users have varying permission levels, as it allows for unauthorized modification of content that other users might trust. The vulnerability enables attackers to persistently alter link data without leaving obvious traces in audit logs, since the operations occur through legitimate plugin interfaces that appear normal to system monitoring tools.
Security practitioners should recognize this vulnerability as a classic example of insufficient authorization checks that aligns with CWE-285, which addresses improper authorization within software systems. The flaw demonstrates how seemingly minor missing capability validations can create significant security risks in content management systems where user roles and permissions are carefully defined. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques and can be leveraged to establish persistent modifications within the WordPress environment. Organizations should implement immediate mitigations including plugin version updates to 4.9.6 or later, which contain the necessary capability checks, and consider implementing additional monitoring for unauthorized thumbnail regeneration activities. Network segmentation and role-based access controls should also be reviewed to minimize the potential impact of such vulnerabilities in compromised accounts.