CVE-2021-21223 : Security Advisory and Response

Integer overflow in Mojo in Google Chrome prior to 90.0.4430.85 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page.

Understanding CVE-2021-21223

This CVE highlights an integer overflow vulnerability in Google Chrome that can be exploited by a remote attacker to escape the sandbox environment.

What is CVE-2021-21223?

The CVE-2021-21223 is an integer overflow vulnerability in Mojo in Google Chrome versions prior to 90.0.4430.85. This flaw could be exploited by a malicious actor who has compromised the renderer process.

The Impact of CVE-2021-21223

The impact of this vulnerability is significant as it allows an attacker to potentially escape the sandbox environment by leveraging a specially crafted HTML page.

Technical Details of CVE-2021-21223

This section will cover the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability arises due to an integer overflow in Mojo in Google Chrome versions prior to 90.0.4430.85, enabling a remote attacker to escape the sandbox environment.

Affected Systems and Versions

Chrome versions less than 90.0.4430.85 are affected by this integer overflow vulnerability, making them susceptible to exploitation.

Exploitation Mechanism

A remote attacker who has compromised the renderer process can exploit this vulnerability by using a meticulously crafted HTML page to escape the sandbox.

Mitigation and Prevention

In this section, we will discuss the immediate steps to take, long-term security practices, and the importance of patching and updates.

Immediate Steps to Take

Users and organizations are advised to update Google Chrome to version 90.0.4430.85 or higher to mitigate the risk of exploitation.

Long-Term Security Practices

To enhance security posture, it is crucial to maintain up-to-date software, employ secure coding practices, and conduct regular security assessments.

Patching and Updates

Regularly check for security updates from Google Chrome and promptly apply patches to address known vulnerabilities.