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CVE-2021-21201 Explained : Impact and Mitigation

Learn about CVE-2021-21201, a critical 'Use after free' vulnerability in Google Chrome allowing remote attackers to potentially perform a sandbox escape. Find out the impact, affected systems, and mitigation steps.

A vulnerability labeled as CVE-2021-21201 was discovered in Google Chrome prior to version 90.0.4430.72. The flaw, categorized as a 'Use after free' issue, could be exploited by a remote attacker to potentially execute a sandbox escape via a maliciously crafted HTML page.

Understanding CVE-2021-21201

This section provides insights into the nature of the CVE-2021-21201 vulnerability, its impact, technical details, and mitigation strategies.

What is CVE-2021-21201?

CVE-2021-21201 is a 'Use after free' vulnerability in Google Chrome that existed in versions prior to 90.0.4430.72. This flaw could allow an attacker who compromised the renderer process to execute a sandbox escape using a specially designed HTML page.

The Impact of CVE-2021-21201

The impact of this vulnerability is significant as it could potentially enable an attacker to bypass sandbox restrictions and execute arbitrary code on the target system. This could lead to further exploitation of the affected system or unauthorized access.

Technical Details of CVE-2021-21201

In-depth technical information regarding the vulnerability, including its description, affected systems, versions, and exploitation mechanisms.

Vulnerability Description

The vulnerability arises from improper handling of permissions in Google Chrome versions prior to 90.0.4430.72, leading to a 'Use after free' condition that can be abused for a sandbox escape.

Affected Systems and Versions

Google Chrome versions below 90.0.4430.72 are impacted by this vulnerability. Users of these versions are advised to update to a secure version to prevent exploitation.

Exploitation Mechanism

An attacker with control over the renderer process could exploit this vulnerability by tricking a user into visiting a malicious HTML page, triggering the 'Use after free' condition and facilitating a sandbox escape.

Mitigation and Prevention

This section outlines the steps users and organizations can take to mitigate the risks associated with CVE-2021-21201 and prevent potential exploitation.

Immediate Steps to Take

Users are advised to update their Google Chrome browser to version 90.0.4430.72 or later to mitigate the risks posed by this vulnerability. Additionally, exercising caution while browsing and avoiding suspicious links can reduce the chances of exploitation.

Long-Term Security Practices

Implementing robust security practices, such as regular software updates, security awareness training, and the use of security tools, can enhance overall cybersecurity posture and reduce the impact of such vulnerabilities.

Patching and Updates

Stay informed about security updates and patches released by Google Chrome. Timely installation of updates is crucial to address known vulnerabilities and protect systems from potential threats.

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