CVE-2017-16949 : Exploit Details and Defense Strategies

A vulnerability has been identified in the AccessKeys AccessPress Anonymous Post Pro plugin for WordPress, allowing attackers to upload malicious files to the server.

Understanding CVE-2017-16949

This CVE involves improper input sanitization in the plugin, leading to arbitrary code execution.

What is CVE-2017-16949?

The vulnerability in the AccessPress Anonymous Post Pro plugin for WordPress allows attackers to bypass file extension and size restrictions, enabling the upload and execution of malicious PHP files.

The Impact of CVE-2017-16949

The vulnerability permits unauthorized users to upload and execute arbitrary PHP code on the server, potentially leading to complete system compromise.

Technical Details of CVE-2017-16949

The following technical aspects of the CVE are crucial to understanding the issue.

Vulnerability Description

Improper sanitization of user input in the plugin allows attackers to override file extension and size limits.
The specific vulnerable files are "inc/cores/file-uploader.php" and "file-uploader/file-uploader-class.php".

Affected Systems and Versions

AccessKeys AccessPress Anonymous Post Pro plugin for WordPress version 3.1.9 and below are affected.

Exploitation Mechanism

Attackers exploit the vulnerability by sending a crafted request to "/wp-admin/admin-ajax.php" with specific parameters, allowing the upload and execution of PHP files.

Mitigation and Prevention

Protecting systems from CVE-2017-16949 requires immediate actions and long-term security practices.

Immediate Steps to Take

Disable or remove the vulnerable plugin from WordPress installations.
Implement strict file upload restrictions and validation mechanisms.
Monitor server logs for any suspicious file uploads.

Long-Term Security Practices

Regularly update and patch all plugins and themes in WordPress.
Conduct security audits and penetration testing to identify and address vulnerabilities.

Patching and Updates

Check for security patches or updates provided by the plugin vendor to address the vulnerability.