CVE-2021-21194 : Exploit Details and Defense Strategies

A detailed analysis of CVE-2021-21194, a vulnerability found in Google Chrome that allowed remote attackers to potentially exploit heap corruption via a crafted HTML page.

Understanding CVE-2021-21194

This section provides insights into the impact and technical details of the CVE-2021-21194 vulnerability.

What is CVE-2021-21194?

The CVE-2021-21194 vulnerability, also known as a Use after free issue, was identified in Google Chrome before version 89.0.4389.114. It enabled remote attackers to potentially trigger heap corruption by using a specially crafted HTML page.

The Impact of CVE-2021-21194

The impact of CVE-2021-21194 was significant as it allowed remote attackers to exploit heap corruption, which could lead to the execution of arbitrary code or a Denial of Service (DoS) condition.

Technical Details of CVE-2021-21194

Here, we delve into the vulnerability description, affected systems and versions, as well as the exploitation mechanism of CVE-2021-21194.

Vulnerability Description

The vulnerability in Google Chrome, prior to version 89.0.4389.114, was a 'Use after free' issue in screen sharing. This flaw could be exploited by a remote attacker using a specially crafted HTML page.

Affected Systems and Versions

Google Chrome versions prior to 89.0.4389.114 were affected by this vulnerability. Users of these versions were at risk of exploitation by malicious actors.

Exploitation Mechanism

By enticing a user to visit a malicious website or click on a crafted link, attackers could trigger the vulnerability, leading to potential heap corruption and subsequent exploitation.

Mitigation and Prevention

In this section, we discuss the immediate steps to take, long-term security practices, and the importance of patching and updates to mitigate the risks associated with CVE-2021-21194.

Immediate Steps to Take

Users are advised to update Google Chrome to version 89.0.4389.114 or newer to mitigate the risk of exploitation. Additionally, exercise caution while browsing unfamiliar websites.

Long-Term Security Practices

Maintaining updated software, using security tools, and staying informed about potential vulnerabilities are crucial for enhancing long-term security posture.

Patching and Updates

Regularly check for updates and patches released by Google Chrome to address security vulnerabilities promptly and ensure a secure browsing experience.