CVE-2021-21120 : What You Need to Know

A detailed article about CVE-2021-21120, a vulnerability in Google Chrome prior to version 88.0.4324.96 that could allow remote attackers to exploit heap corruption.

Understanding CVE-2021-21120

This section provides insights into the nature and impact of the CVE-2021-21120 vulnerability in Google Chrome.

What is CVE-2021-21120?

The CVE-2021-21120 vulnerability is classified as a 'Use after free' issue in WebSQL in Google Chrome versions earlier than 88.0.4324.96. It allows a remote attacker to potentially exploit heap corruption by utilizing a crafted HTML page.

The Impact of CVE-2021-21120

The impact of CVE-2021-21120 can be severe as it enables remote attackers to potentially corrupt the heap, leading to further exploitation and compromise of the affected system.

Technical Details of CVE-2021-21120

In this section, we delve into the specific technical aspects of the CVE-2021-21120 vulnerability.

Vulnerability Description

The vulnerability resides in the WebSQL component of Google Chrome, where improper handling of memory operations can be exploited by remote attackers through a specially crafted HTML page.

Affected Systems and Versions

Google Chrome versions prior to 88.0.4324.96 are affected by this vulnerability. Users with earlier versions are at risk of exploitation until they update to a secure version.

Exploitation Mechanism

Remote attackers can exploit the CVE-2021-21120 vulnerability by luring a victim to visit a malicious website hosting a crafted HTML page that triggers the use after free condition in WebSQL.

Mitigation and Prevention

This section outlines the steps to mitigate the risks posed by CVE-2021-21120 and prevent potential exploitation.

Immediate Steps to Take

Users are advised to update their Google Chrome browser to version 88.0.4324.96 or later to mitigate the CVE-2021-21120 vulnerability and protect their systems from potential attacks.

Long-Term Security Practices

Implementing secure browsing habits, avoiding unknown or suspicious websites, and keeping browser software up to date are essential long-term security practices to prevent similar vulnerabilities.

Patching and Updates

Regularly checking for browser updates, enabling automatic updates, and applying security patches promptly can help prevent exploitation of known vulnerabilities like CVE-2021-21120.