CVE-2021-21155 : What You Need to Know

Heap buffer overflow in Tab Strip in Google Chrome on Windows prior to version 88.0.4324.182 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page.

Understanding CVE-2021-21155

This CVE refers to a specific vulnerability in Google Chrome that could be exploited by a remote attacker to escape the browser's sandbox environment.

What is CVE-2021-21155?

The vulnerability identified as CVE-2021-21155 is a heap buffer overflow in the Tab Strip component of Google Chrome on Windows systems. This flaw could be leveraged by a threat actor who had compromised the renderer process, enabling the potential for a sandbox escape through a specially crafted HTML page.

The Impact of CVE-2021-21155

The impact of this vulnerability could be significant, as it may allow an attacker to execute arbitrary code outside the confines of the browser's sandbox. This could lead to further system compromise or unauthorized access to sensitive information.

Technical Details of CVE-2021-21155

This section outlines specific technical details related to the CVE-2021-21155 vulnerability.

Vulnerability Description

The vulnerability involves a heap buffer overflow in the Tab Strip component of Google Chrome on Windows systems, potentially enabling a sandbox escape.

Affected Systems and Versions

Google Chrome versions prior to 88.0.4324.182 on Windows operating systems are affected by this vulnerability.

Exploitation Mechanism

The vulnerability can be exploited by a remote attacker who has compromised the renderer process and can deliver a specially crafted HTML page to trigger the heap buffer overflow and potentially perform a sandbox escape.

Mitigation and Prevention

To address and prevent the exploitation of CVE-2021-21155, specific mitigation and prevention steps can be taken.

Immediate Steps to Take

Users and administrators are advised to update Google Chrome to version 88.0.4324.182 or later to prevent exploitation of this vulnerability. Additionally, exercising caution while browsing and avoiding suspicious websites can help reduce the risk of exploitation.

Long-Term Security Practices

Implementing secure browsing habits, keeping software up to date, and employing endpoint protection solutions can contribute to long-term security practices that help defend against similar vulnerabilities.

Patching and Updates

Regularly checking for and applying security patches released by Google for Chrome can help ensure that known vulnerabilities are addressed promptly, reducing the overall risk exposure.