CVE-2021-30549 : Exploit Details and Defense Strategies

Google Chrome prior to version 91.0.4472.101 is affected by a use-after-free vulnerability in the Spell check feature. An attacker could exploit this issue by persuading a user to install a malicious extension, leading to potential heap corruption through a specially crafted HTML page.

Understanding CVE-2021-30549

This section delves into the details of the CVE-2021-30549 vulnerability in Google Chrome.

What is CVE-2021-30549?

The use-after-free vulnerability in the Spell check functionality of Google Chrome before 91.0.4472.101 allows an attacker to induce heap corruption through a malicious extension installation.

The Impact of CVE-2021-30549

The impact of this vulnerability is significant as it could lead to arbitrary code execution or a system crash when successfully exploited.

Technical Details of CVE-2021-30549

Let's explore the technical aspects of CVE-2021-30549 to understand its implications better.

Vulnerability Description

The vulnerability arises from improper handling of objects in memory after they have been freed, potentially leading to heap corruption.

Affected Systems and Versions

Google Chrome versions prior to 91.0.4472.101 are susceptible to this use-after-free vulnerability in the Spell check feature.

Exploitation Mechanism

Attackers can exploit this issue by tricking a user into installing a malicious extension, which can then trigger the vulnerability through a crafted HTML page.

Mitigation and Prevention

To safeguard systems against CVE-2021-30549, it is crucial to take immediate action and implement long-term security measures.

Immediate Steps to Take

Users should update their Google Chrome browsers to version 91.0.4472.101 or later to mitigate the risk of exploitation.

Long-Term Security Practices

Regularly update browsers and refrain from installing unverified extensions to reduce the attack surface and enhance overall security.

Patching and Updates

Stay informed about security advisories from trusted sources and promptly apply patches to address known vulnerabilities.