CVE-2021-24798 : Security Advisory and Response

The WP Header Images WordPress plugin before version 2.0.1 is vulnerable to a Reflected Cross-Site Scripting issue due to improper sanitization of user input.

Understanding CVE-2021-24798

This CVE identifies a security vulnerability in the WP Header Images plugin that could allow attackers to perform Cross-Site Scripting attacks.

What is CVE-2021-24798?

The vulnerability in the WP Header Images plugin arises from the lack of proper sanitization and escaping of the 't' parameter before displaying it on the plugin's settings page, creating an opportunity for malicious script injection.

The Impact of CVE-2021-24798

As a result of this vulnerability, an attacker can craft malicious links that, when clicked by an authenticated user with the plugin enabled, may execute arbitrary scripts within the user's context. This can lead to unauthorized actions or data theft.

Technical Details of CVE-2021-24798

The following details provide a deeper insight into the technical aspects of this security issue:

Vulnerability Description

The vulnerability allows for Reflected Cross-Site Scripting (XSS) due to the lack of proper input sanitization for the 't' parameter in the plugin's settings page.

Affected Systems and Versions

WP Header Images versions prior to 2.0.1 are affected by this vulnerability, making sites using these versions susceptible to XSS attacks.

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating the 't' parameter in crafted URLs, prompting unsuspecting users to click on the malicious links and execute arbitrary code.

Mitigation and Prevention

To address CVE-2021-24798 and enhance the security of your WordPress site, consider implementing the following measures:

Immediate Steps to Take

Update the WP Header Images plugin to version 2.0.1 or newer to patch the vulnerability.
Regularly monitor your site for any suspicious activity or unauthorized changes.

Long-Term Security Practices

Educate users about the risks of clicking on unknown or suspicious links within the WordPress site.
Employ web application firewalls (WAFs) to filter and block malicious traffic targeting XSS vulnerabilities.

Patching and Updates

Stay informed about security updates and patches released by the WP Header Images plugin developers. Promptly apply these updates to mitigate the risk of exploitation.