CVE-2021-28556 Explained : Impact and Mitigation

Magento Commerce versions 2.4.2, 2.4.1-p1, and 2.3.6-p1 are vulnerable to a DOM-based Cross-Site Scripting (XSS) flaw, allowing unauthenticated attackers to execute arbitrary JavaScript. This article provides insights into the vulnerability, its impact, technical details, and mitigation steps.

Understanding CVE-2021-28556

This section delves into the specifics of the Magento Commerce vulnerability and its implications.

What is CVE-2021-28556?

Magento versions 2.4.2, 2.4.1-p1, and 2.3.6-p1 contain a DOM-based Cross-Site Scripting vulnerability on mage-messages cookies. Exploiting this flaw could result in the execution of arbitrary JavaScript by malicious actors without authentication, provided there is user interaction.

The Impact of CVE-2021-28556

The vulnerability poses a MEDIUM severity threat with a CVSS base score of 6.9. It allows for high confidentiality impact and low integrity impact, requiring high privileges from the attacker while changing the scope.

Technical Details of CVE-2021-28556

This section discusses the technical aspects of the CVE, including the nature of the vulnerability, affected systems, and the exploitation mechanism.

Vulnerability Description

CVE-2021-28556 involves a DOM-based XSS vulnerability in Magento Commerce versions 2.4.2, 2.4.1-p1, and 2.3.6-p1 that allows attackers to execute arbitrary JavaScript code via mage-messages cookies.

Affected Systems and Versions

Magento Commerce versions 2.4.2, 2.4.1-p1, and 2.3.6-p1 are confirmed to be impacted by this XSS vulnerability.

Exploitation Mechanism

Successful exploitation of this vulnerability requires user interaction to trigger the malicious JavaScript execution on vulnerable systems.

Mitigation and Prevention

In this section, you'll find guidance on how to address and prevent the risks associated with CVE-2021-28556.

Immediate Steps to Take

Immediately update Magento Commerce to a non-vulnerable version and sanitize user inputs to mitigate the risk of XSS attacks.

Long-Term Security Practices

Regularly monitor security advisories, apply security patches promptly, and educate users regarding safe browsing habits to enhance overall security posture.

Patching and Updates

Stay informed about security updates and patches released by Magento and follow best practices for secure coding and web application development.