CVE-2021-39333 : Security Advisory and Response

The Hashthemes Demo Importer Plugin for WordPress version 1.1.1 and earlier contains a vulnerability that may allow logged-in users to execute functions leading to data loss.

Understanding CVE-2021-39333

This CVE describes an improper access control issue in the Hashthemes Demo Importer plugin for WordPress.

What is CVE-2021-39333?

The Hashthemes Demo Importer Plugin version 1.1.1 and below for WordPress had AJAX functions with a visible nonce accessible to all logged-in users. This flaw could permit users to truncate database tables and delete wp-content/uploads content.

The Impact of CVE-2021-39333

The vulnerability has a CVSS base score of 8.1, indicating a high severity issue with potential for data loss.

Technical Details of CVE-2021-39333

This section covers in-depth technical details of the CVE.

Vulnerability Description

The vulnerability stemmed from the plugin's reliance on a visible nonce for access control, allowing unauthorized users to execute database truncation and content deletion functions.

Affected Systems and Versions

Affected Platform: WordPress
Affected Product: Hashthemes Demo Importer
Vulnerable Version: 1.1.1

Exploitation Mechanism

The flaw was exploited by leveraging the visible nonce in AJAX functions, enabling logged-in users to carry out data-modifying actions.

Mitigation and Prevention

Here are steps to mitigate risks associated with CVE-2021-39333.

Immediate Steps to Take

Update the Hashthemes Demo Importer plugin to a secure version immediately.
Consider revoking access to non-admin users until the patch is applied.

Long-Term Security Practices

Implement role-based access control to limit user privileges.
Regularly audit plugins and themes for security vulnerabilities.

Patching and Updates

Stay informed about security updates for all installed plugins.
Apply patches promptly to protect against known vulnerabilities.