CVE-2021-24853 : Security Advisory and Response

A detailed overview of CVE-2021-24853, a vulnerability in the QR Redirector WordPress plugin before version 1.6 that could allow unauthorized users to change the redirect response status of arbitrary QR Redirects.

Understanding CVE-2021-24853

This section will cover the essential details regarding the CVE-2021-24853 vulnerability.

What is CVE-2021-24853?

The CVE-2021-24853 vulnerability exists in the QR Redirector WordPress plugin version 1.6 and below, where it lacks capability and CSRF checks when saving bulk QR Redirector settings. This flaw permits any authenticated user, even subscribers, to modify the redirect response status code of various QR Redirects.

The Impact of CVE-2021-24853

The impact of CVE-2021-24853 is significant as it enables unauthorized users to manipulate QR Redirects' response status codes, potentially leading to redirecting users to malicious websites or pages.

Technical Details of CVE-2021-24853

In this section, we delve into the technical specifics of the CVE-2021-24853 vulnerability.

Vulnerability Description

The vulnerability arises from the lack of capability and CSRF checks in the QR Redirector WordPress plugin versions prior to 1.6 when saving bulk settings, allowing unauthorized users to alter QR Redirects' response status.

Affected Systems and Versions

The affected product is the QR Redirector plugin, specifically versions below 1.6. Users who have not updated to the latest version are at risk of exploitation.

Exploitation Mechanism

Exploiting CVE-2021-24853 involves leveraging the absence of proper capability and CSRF checks in the plugin to change the redirect response status code for arbitrary QR Redirects.

Mitigation and Prevention

This section focuses on the necessary steps to mitigate and prevent the CVE-2021-24853 vulnerability.

Immediate Steps to Take

Users are advised to update the QR Redirector plugin to version 1.6 or above to mitigate the vulnerability and ensure proper capability and CSRF checks for bulk settings.

Long-Term Security Practices

Implementing proper access controls, regular security audits, and user permissions review can enhance overall security posture and prevent similar vulnerabilities in the future.

Patching and Updates

Regularly monitoring and applying security patches and updates for WordPress plugins, such as QR Redirector, is crucial in maintaining a secure WordPress environment.