CVE-2021-30591 Explained : Impact and Mitigation

A detailed overview of CVE-2021-30591, a vulnerability in Google Chrome prior to version 92.0.4515.131 that could allow a remote attacker to exploit heap corruption via a crafted HTML page.

Understanding CVE-2021-30591

This section delves into the nature and implications of the vulnerability.

What is CVE-2021-30591?

The CVE-2021-30591 vulnerability involves a 'Use after free' flaw in the File System API in Google Chrome versions prior to 92.0.4515.131. This flaw could be exploited by a remote attacker to potentially achieve heap corruption by enticing a user to visit a malicious website designed with a crafted HTML page.

The Impact of CVE-2021-30591

The impact of this vulnerability is significant as it allows an attacker to execute arbitrary code and potentially take control of the affected system. By exploiting heap corruption, sensitive information could be accessed or the system could be manipulated for malicious purposes.

Technical Details of CVE-2021-30591

This section provides technical insights into the vulnerability.

Vulnerability Description

The vulnerability stems from a use-after-free issue in the File System API, enabling an attacker to manipulate memory allocation post deallocation leading to potential heap corruption.

Affected Systems and Versions

Google Chrome versions prior to 92.0.4515.131 are affected by this vulnerability. Users with outdated Chrome installations are at risk of exploitation.

Exploitation Mechanism

To exploit CVE-2021-30591, an attacker crafts a malicious HTML page and lures a user into visiting it. Upon successful execution, the attacker can trigger the use-after-free flaw and achieve heap corruption.

Mitigation and Prevention

This section outlines steps to mitigate the risks associated with CVE-2021-30591.

Immediate Steps to Take

Users are strongly advised to update their Google Chrome browser to version 92.0.4515.131 or later to patch the vulnerability and prevent possible exploitation.

Long-Term Security Practices

Regularly updating software, employing security best practices, and exercising caution while browsing can help safeguard against such vulnerabilities.

Patching and Updates

Google has released security updates to address CVE-2021-30591. Users should promptly apply these patches to enhance the security of their systems.