CVE-2021-24279 : Exploit Details and Defense Strategies

This article provides an overview of CVE-2021-24279, a vulnerability in the Redirection for Contact Form 7 WordPress plugin before version 2.3.4 that allowed low-level users to install any plugin from the WordPress repository.

Understanding CVE-2021-24279

In the Redirection for Contact Form 7 WordPress plugin before version 2.3.4, a security issue allowed unauthorized users to perform an authenticated arbitrary plugin installation, posing a risk to the website's security.

What is CVE-2021-24279?

CVE-2021-24279 refers to a vulnerability in the Redirection for Contact Form 7 WordPress plugin that enabled low-level users to leverage the import_from_debug AJAX action to install any plugin from the WordPress repository, regardless of permissions.

The Impact of CVE-2021-24279

This security flaw could be exploited by subscribers or other low-level users to escalate their privileges and potentially install malicious plugins, compromising the integrity and security of the WordPress site.

Technical Details of CVE-2021-24279

In this section, we delve into the technical aspects of the CVE-2021-24279 vulnerability.

Vulnerability Description

The vulnerability in the Redirection for Contact Form 7 plugin before version 2.3.4 allowed unauthorized users, such as subscribers, to execute the import_from_debug AJAX action, leading to the installation of any plugin from the WordPress repository.

Affected Systems and Versions

Redirection for Contact Form 7 plugin versions prior to 2.3.4 are affected by this vulnerability, making websites using these versions susceptible to arbitrary plugin installations.

Exploitation Mechanism

Exploiting CVE-2021-24279 involved leveraging the import_from_debug AJAX action, which could be executed by unauthorized low-level users, enabling them to bypass authorization restrictions and install unauthorized plugins.

Mitigation and Prevention

To protect your WordPress site from CVE-2021-24279 and similar vulnerabilities, follow the mitigation strategies below.

Immediate Steps to Take

Upgrade the Redirection for Contact Form 7 plugin to version 2.3.4 or above to patch the vulnerability and prevent unauthorized plugin installations.

Long-Term Security Practices

Regularly update all plugins and WordPress core to the latest versions, implement least privilege access controls, and monitor for any suspicious plugin installations or activities.

Patching and Updates

Stay informed about security patches and updates released by plugin developers, apply patches promptly to mitigate potential security risks and ensure the protection of your WordPress site.