CVE-2021-21193 : Security Advisory and Response

A remote attacker was able to potentially exploit heap corruption in Google Chrome prior to version 89.0.4389.90 through a vulnerability known as Use after free in Blink. Here is what you need to know about this CVE.

Understanding CVE-2021-21193

This section will cover what CVE-2021-21193 is, its impact, technical details, and mitigation methods.

What is CVE-2021-21193?

CVE-2021-21193 refers to a Use after free vulnerability in Blink in Google Chrome versions before 89.0.4389.90. This flaw could allow a remote attacker to execute arbitrary code by exploiting heap corruption using a specially crafted HTML page.

The Impact of CVE-2021-21193

The impact of this vulnerability includes the potential for a remote attacker to perform various malicious actions, such as executing arbitrary code, causing a denial of service, or gaining unauthorized access to sensitive information.

Technical Details of CVE-2021-21193

Let's delve deeper into the technical aspects of CVE-2021-21193 to understand how this vulnerability works.

Vulnerability Description

The vulnerability arises from a memory corruption issue in the Blink rendering engine of Google Chrome. An attacker can trigger this flaw by tricking a user into visiting a malicious website containing the exploit, leading to potential heap corruption.

Affected Systems and Versions

Google Chrome versions prior to 89.0.4389.90 are affected by this vulnerability. Users operating on these versions are at risk of exploitation by remote threat actors.

Exploitation Mechanism

The exploitation of CVE-2021-21193 involves crafting a malicious HTML page to trigger a use-after-free condition in the Chrome browser and exploit heap corruption to execute arbitrary code.

Mitigation and Prevention

To safeguard your system from potential exploitation of CVE-2021-21193, it is essential to follow appropriate mitigation and prevention measures.

Immediate Steps to Take

Users are advised to update their Google Chrome browser to version 89.0.4389.90 or later to mitigate the risk posed by this vulnerability. Additionally, exercise caution while visiting untrusted websites or clicking on suspicious links.

Long-Term Security Practices

Maintaining up-to-date software versions, employing robust security solutions, and promoting user awareness on safe browsing practices are essential long-term security measures to prevent similar vulnerabilities.

Patching and Updates

Regularly check for security updates released by Google Chrome and promptly install patches to address known vulnerabilities and enhance the overall security posture of your system.