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CVE-2021-24857 : Vulnerability Insights and Analysis

Discover the details of CVE-2021-24857 impacting ToTop Link WordPress plugin. Learn the impact, vulnerability, affected versions, and mitigation steps for unauthenticated PHP object injection.

ToTop Link plugin version 1.7.1 and below in WordPress is vulnerable to unauthenticated PHP object injection. The plugin passes base64 encoded user input to the unserialize() PHP function, which can result in PHP object injection if a plugin with a suitable gadget chain is installed.

Understanding CVE-2021-24857

This section will cover the details regarding the CVE-2021-24857 vulnerability in ToTop Link WordPress plugin.

What is CVE-2021-24857?

The CVE-2021-24857 vulnerability is an unauthenticated PHP object injection flaw in the ToTop Link WordPress plugin version 1.7.1 and earlier. It arises due to the plugin passing base64 encoded user input to the unserialize() PHP function.

The Impact of CVE-2021-24857

The impact of this vulnerability is the potential for PHP object injection, allowing attackers to execute arbitrary code on the server if a compatible gadget chain is present.

Technical Details of CVE-2021-24857

Explore the technical details surrounding CVE-2021-24857 to understand the vulnerability better.

Vulnerability Description

The vulnerability stems from the improper handling of user input by passing base64 encoded data to the unserialize() PHP function.

Affected Systems and Versions

ToTop Link plugin versions up to and including 1.7.1 are affected by this vulnerability within WordPress installations.

Exploitation Mechanism

Exploiting this vulnerability requires an attacker to craft a specific payload to trigger the PHP object injection flaw.

Mitigation and Prevention

Learn how to mitigate the risks associated with CVE-2021-24857 and prevent possible exploitation.

Immediate Steps to Take

Immediately update the ToTop Link plugin to a version beyond 1.7.1 to mitigate the PHP object injection vulnerability.

Long-Term Security Practices

Regularly update all plugins and themes, use additional security plugins, and follow WordPress security best practices to enhance overall security.

Patching and Updates

Stay informed about security patches and updates for ToTop Link to apply the latest fixes promptly.

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