File Type Validation Bypass in FileOrganizer WordPress Plugin

Executive Summary

The FileOrganizer WordPress plugin before version 1.2.0 does not properly validate file types during several file-management operations. This flaw allows authenticated users with file-manager access, which can be extended to sub-administrator roles via a premium add-on, to upload arbitrary PHP files. Uploading these malicious PHP files can lead to remote code execution on the affected system.

This vulnerability is an incomplete fix of a previous issue (CVE-2024-7985) that only added file-type validation during the upload operation but missed other file-management tasks.

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Detection Guidance

This vulnerability involves the FileOrganizer WordPress plugin versions prior to 1.2.0 allowing authenticated users with file-manager access to upload arbitrary PHP files via elFinder file operations. Detection involves verifying the plugin version and monitoring for suspicious file uploads.

• Check the installed version of the FileOrganizer plugin to ensure it is 1.2.0 or later.
• Monitor file upload directories for unexpected PHP files that could indicate exploitation attempts.
• Use WordPress CLI to check plugin version: `wp plugin list | grep fileorganizer`
• Search for recently uploaded PHP files in the WordPress uploads directory: `find wp-content/uploads/ -name '*.php' -mtime -7` (to find PHP files uploaded in the last 7 days)
• Review web server logs for suspicious POST requests to elFinder or file-management endpoints.

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Impact Analysis

If exploited, this vulnerability allows an authenticated user with file-manager access to upload malicious PHP files, which can result in remote code execution. This means an attacker could execute arbitrary code on the server hosting the WordPress site, potentially leading to full system compromise, data theft, defacement, or further attacks within the network.

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Mitigation Strategies

To mitigate this vulnerability, immediately update the FileOrganizer WordPress plugin to version 1.2.0 or later, as this version contains the fix that properly validates file types during all file-management operations.

Additionally, restrict file-manager access to trusted users only, especially if using the premium add-on that extends access to sub-administrator roles, to reduce the risk of arbitrary PHP file uploads.

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