CVE-2021-24884 : Exploit Details and Defense Strategies

A detailed overview of the CVE-2021-24884 vulnerability in Formidable Form Builder plugin for WordPress.

Understanding CVE-2021-24884

This CVE involves a vulnerability in the Formidable Form Builder WordPress plugin before version 4.09.05 that allows for unauthenticated stored cross-site scripting.

What is CVE-2021-24884?

The Formidable Form Builder plugin before 4.09.05 allows the injection of certain HTML tags like <audio>, <video>, <img>, <a>, and <button>, enabling a remote attacker to exploit HTML injection and execute JavaScript code upon a user's interaction.

The Impact of CVE-2021-24884

Insufficient sanitization of the "data-frmverify" tag for links in the web-based entry inspection page of affected systems could lead to arbitrary actions on the system. This includes stealing user accounts, remote code execution, and unauthorized code submission.

Technical Details of CVE-2021-24884

An in-depth look at the technical aspects of the CVE-2021-24884 vulnerability in the Formidable Form Builder plugin.

Vulnerability Description

The vulnerability arises from inadequate sanitization of HTML tags, allowing malicious link injections and potential execution of JavaScript code, leading to severe consequences.

Affected Systems and Versions

The issue affects the Formidable Form Builder plugin for WordPress versions earlier than 4.09.05.

Exploitation Mechanism

Attackers can trick authenticated users into clicking malicious links that may lead to the execution of JavaScript or PHP code, compromising system integrity.

Mitigation and Prevention

Essential steps to mitigate the risks associated with CVE-2021-24884 and prevent similar exploits in the future.

Immediate Steps to Take

Users should update the Formidable Form Builder plugin to version 4.09.05 or later to patch the vulnerability and enhance security.

Long-Term Security Practices

Regularly update plugins, maintain strong authentication mechanisms, and educate users on identifying and avoiding phishing attempts.

Patching and Updates

Stay informed about security updates released by the plugin vendor and promptly apply patches to secure the WordPress environment.