CVE-2021-37973 : Security Advisory and Response

A detailed overview of CVE-2021-37973, a vulnerability in Google Chrome versions prior to 94.0.4606.61 that could allow a remote attacker to perform a sandbox escape.

Understanding CVE-2021-37973

CVE-2021-37973 is a 'Use after free' vulnerability in Portals in Google Chrome versions less than 94.0.4606.61. This flaw could be exploited by a remote attacker to potentially escape the sandbox by using a specially crafted HTML page.

What is CVE-2021-37973?

CVE-2021-37973 is a security vulnerability in Google Chrome that involves a 'Use after free' issue in Portals. An attacker who has taken control of the renderer process could leverage this flaw to escape the browser's sandbox environment.

The Impact of CVE-2021-37973

The impact of CVE-2021-37973 is significant as it allows a compromised renderer process to execute arbitrary code outside the confines of the sandbox, potentially leading to further system compromise or unauthorized access.

Technical Details of CVE-2021-37973

This section provides more insight into the technical aspects of the CVE-2021-37973 vulnerability.

Vulnerability Description

The vulnerability arises from a memory corruption issue in the handling of Portals in Google Chrome, specifically versions prior to 94.0.4606.61. Exploiting this flaw allows an attacker to manipulate memory post-deallocation, leading to potential sandbox escape.

Affected Systems and Versions

Google Chrome versions less than 94.0.4606.61 are affected by CVE-2021-37973. Users of these versions are at risk of exploitation by malicious actors aiming to escape the browser's sandbox.

Exploitation Mechanism

The exploitation of CVE-2021-37973 involves the use of a crafted HTML page by an attacker who has already compromised the renderer process. By triggering the 'Use after free' condition, the attacker can execute arbitrary code and escape the sandbox.

Mitigation and Prevention

Protecting systems against CVE-2021-37973 requires immediate action and long-term security measures.

Immediate Steps to Take

Users are advised to update Google Chrome to version 94.0.4606.61 or later to mitigate CVE-2021-37973. Additionally, exercise caution while browsing and avoid clicking on suspicious links or downloading files from untrusted sources.

Long-Term Security Practices

Practicing good cybersecurity hygiene, such as keeping software up to date, using reputable security tools, and staying informed about the latest threats, can help prevent similar vulnerabilities in the future.

Patching and Updates

Regularly check for security updates from Google Chrome and apply them promptly to ensure protection against known vulnerabilities, including CVE-2021-37973.