CVE-2021-4321 Explained : Impact and Mitigation

A detailed analysis of CVE-2021-4321, a vulnerability in Google Chrome that allowed a remote attacker to bypass content security policy via a crafted HTML page.

Understanding CVE-2021-4321

This section provides insights into the impact and technical details of the CVE-2021-4321 vulnerability.

What is CVE-2021-4321?

The CVE-2021-4321 vulnerability involved a policy bypass in Blink in Google Chrome versions prior to 91.0.4472.77. It enabled a remote attacker to bypass content security policy through a maliciously designed HTML page. The severity level of this vulnerability was rated as Low, as per Chromium security.

The Impact of CVE-2021-4321

The impact of this vulnerability was significant as it allowed threat actors to circumvent content security policies, potentially leading to unauthorized access or execution of malicious scripts on affected systems.

Technical Details of CVE-2021-4321

Explore the technical aspects of CVE-2021-4321 to understand the nature of the vulnerability.

Vulnerability Description

The vulnerability in Google Chrome versions prior to 91.0.4472.77 facilitated a policy bypass in Blink, enabling an attacker to evade content security policies using a specially crafted HTML page.

Affected Systems and Versions

Google Chrome versions before 91.0.4472.77 were impacted by this vulnerability, leaving systems running these versions at risk of exploitation.

Exploitation Mechanism

By leveraging the flaw in Blink, threat actors could create malicious HTML pages that bypassed content security policies, potentially leading to unauthorized actions.

Mitigation and Prevention

Discover measures to mitigate the risks associated with CVE-2021-4321 and prevent exploitation attempts.

Immediate Steps to Take

Users and administrators should update Google Chrome to version 91.0.4472.77 or above to mitigate the vulnerability and enhance system security.

Long-Term Security Practices

Implementing robust content security policies, regular security updates, and user awareness training can bolster long-term security against similar threats.

Patching and Updates

Regularly monitor for security patches and updates from Google Chrome to stay protected against emerging vulnerabilities like CVE-2021-4321.