CVE-2024-11613: WordPress File Upload Plugin RCE Vulnerability

CVE-2024-11613 Overview

CVE-2024-11613 is a critical Remote Code Execution (RCE) vulnerability affecting the WordPress File Upload plugin for WordPress. The vulnerability exists in the wfu_file_downloader.php file, where improper sanitization of the source parameter combined with user-controlled directory path input enables unauthenticated attackers to execute arbitrary code, read arbitrary files, and delete arbitrary files on vulnerable WordPress installations.

Critical Impact

Unauthenticated attackers can achieve complete server compromise through remote code execution, arbitrary file read, and arbitrary file deletion without any user interaction or authentication requirements.

Affected Products

• Iptanus WordPress File Upload plugin versions up to and including 4.24.15
• WordPress installations with the vulnerable plugin active
• All WordPress sites running unpatched versions of the WordPress File Upload plugin

Discovery Timeline

• 2025-01-08 - CVE-2024-11613 published to NVD
• 2025-04-17 - Last updated in NVD database

Technical Details for CVE-2024-11613

Vulnerability Analysis

This vulnerability is classified as CWE-94 (Improper Control of Generation of Code / Code Injection). The WordPress File Upload plugin fails to properly validate and sanitize user-supplied input in the wfu_file_downloader.php file. The vulnerable source parameter accepts user-controlled directory paths without adequate security controls, creating a pathway for malicious actors to manipulate file system operations and execute arbitrary code on the server.

The attack can be executed remotely over the network with low complexity and requires no authentication or user interaction, making it highly dangerous for exposed WordPress installations. Successful exploitation leads to complete compromise of confidentiality, integrity, and availability of the affected system.

Root Cause

The root cause of CVE-2024-11613 stems from insufficient input validation in the wfu_file_downloader.php file. The source parameter accepts arbitrary directory paths from users without proper sanitization, allowing attackers to traverse the file system and access unauthorized resources. The lack of proper path canonicalization and allowlist-based validation enables path traversal attacks that can be chained with code execution primitives.

Attack Vector

The attack vector is network-based, requiring only HTTP access to the vulnerable WordPress installation. An unauthenticated attacker can craft malicious requests to the wfu_file_downloader.php endpoint, manipulating the source parameter to:

1. Execute Arbitrary Code: By leveraging the unsanitized path parameter to include or execute malicious PHP code
2. Read Sensitive Files: Access configuration files, credentials, and other sensitive data through arbitrary file read
3. Delete Critical Files: Remove important system or application files through arbitrary file deletion

The vulnerability requires no privileges or user interaction, making automated exploitation highly feasible. For detailed technical information about the vulnerability mechanism, refer to the Wordfence Vulnerability Report and the vulnerable file source.

Detection Methods for CVE-2024-11613

Indicators of Compromise

• Unusual HTTP requests targeting wfu_file_downloader.php with suspicious source parameter values
• Unexpected file system access patterns, particularly reads or deletions in sensitive directories
• Web server logs showing path traversal sequences (e.g., ../) in requests to the WordPress File Upload plugin
• New or modified PHP files in unexpected locations within the WordPress installation

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block path traversal attempts in requests to wfu_file_downloader.php
• Monitor web server access logs for anomalous requests targeting the WordPress File Upload plugin endpoints
• Deploy file integrity monitoring to detect unauthorized file modifications, creations, or deletions
• Use endpoint detection solutions to identify suspicious PHP process execution patterns

Monitoring Recommendations

• Enable verbose logging for the WordPress File Upload plugin and review logs for suspicious activity
• Configure real-time alerting for requests containing path traversal sequences targeting plugin files
• Implement network-level monitoring for unusual outbound connections from the WordPress server that may indicate post-exploitation activity

How to Mitigate CVE-2024-11613

Immediate Actions Required

• Update the WordPress File Upload plugin to version 4.24.16 or later immediately
• If immediate patching is not possible, deactivate and remove the WordPress File Upload plugin until a patched version can be deployed
• Review web server logs for indicators of prior exploitation attempts
• Conduct a file integrity check to identify any unauthorized modifications to the WordPress installation

Patch Information

The vendor has released a security patch addressing this vulnerability. The fix is documented in WordPress Changeset #3217005. Site administrators should update the WordPress File Upload plugin through the WordPress admin dashboard or by manually downloading the patched version from the WordPress plugin repository.

Workarounds

• Disable the WordPress File Upload plugin entirely until patching is possible
• Implement strict WAF rules to block requests containing path traversal sequences to plugin endpoints
• Restrict network access to the WordPress admin area and plugin directories using IP allowlisting
• Consider using a maintenance page to take the site offline temporarily while applying security updates

# Example: Block access to vulnerable file via .htaccess
<Files "wfu_file_downloader.php">
    Order Allow,Deny
    Deny from all
</Files>