CVE-2021-30543 : Security Advisory and Response

Use after free in Tab Strip in Google Chrome prior to version 91.0.4472.77 allowed an attacker to potentially exploit heap corruption via a crafted HTML page.

Understanding CVE-2021-30543

This CVE details a vulnerability in Google Chrome that could be exploited by convincing a user to install a malicious extension.

What is CVE-2021-30543?

The CVE-2021-30543 vulnerability, labeled as a 'Use after free' issue, existed in Google Chrome versions prior to 91.0.4472.77. It allowed attackers to exploit heap corruption by tricking users into installing a malicious extension.

The Impact of CVE-2021-30543

The impact of this vulnerability could lead to potential heap corruption, providing attackers with the means to execute arbitrary code or cause a denial of service by crashing the browser.

Technical Details of CVE-2021-30543

This section outlines the technical aspects of the CVE.

Vulnerability Description

The vulnerability stemmed from a use-after-free flaw in Tab Strip in Google Chrome, enabling attackers to corrupt the heap memory through a specifically crafted HTML page.

Affected Systems and Versions

Google Chrome versions prior to 91.0.4472.77 are affected by this vulnerability, making users of these versions susceptible to exploitation.

Exploitation Mechanism

Attackers could exploit this vulnerability by convincing users to install a malicious extension, subsequently triggering heap corruption through a crafted HTML page.

Mitigation and Prevention

To protect systems from CVE-2021-30543, immediate actions should be taken along with the implementation of long-term security practices.

Immediate Steps to Take

Users are advised to update Google Chrome to version 91.0.4472.77 or later to mitigate the risk of exploitation. Additionally, be cautious while installing browser extensions.

Long-Term Security Practices

Regularly update Chrome to the latest version, exercise caution while interacting with untrusted websites, and avoid installing extensions from unknown sources.

Patching and Updates

Google Chrome users should apply security patches promptly, enabling automatic updates for increased protection against known vulnerabilities.