CVE-2021-21133 : Security Advisory and Response

Google Chrome before 88.0.4324.96 is affected by CVE-2021-21133 due to insufficient policy enforcement in Downloads. This flaw could allow an attacker to bypass navigation restrictions by tricking a user into downloading files via a malicious HTML page.

Understanding CVE-2021-21133

This section will delve into the details of the CVE-2021-21133 vulnerability in Google Chrome.

What is CVE-2021-21133?

CVE-2021-21133 refers to the insufficient policy enforcement in Downloads within Google Chrome versions prior to 88.0.4324.96. Attackers can exploit this vulnerability by persuading users to download files through a specially crafted HTML page.

The Impact of CVE-2021-21133

The impact of CVE-2021-21133 can lead to bypassing security restrictions within the browser, potentially enabling malicious actors to execute further attacks or gain unauthorized access to user systems.

Technical Details of CVE-2021-21133

Let's explore the technical aspects related to CVE-2021-21133 in Google Chrome.

Vulnerability Description

The vulnerability arises from a failure in enforcing proper policies regarding downloads in Google Chrome versions preceding 88.0.4324.96, which can be leveraged to evade navigation constraints via deceptive file downloads.

Affected Systems and Versions

Google Chrome versions below 88.0.4324.96 are impacted by this vulnerability, particularly those systems where users can be manipulated into downloading files illicitly.

Exploitation Mechanism

By employing a well-crafted HTML page, threat actors can trick users into downloading files that compromise their systems, exploiting the vulnerability to steer clear of browser security measures.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-21133, users and organizations can take the following steps:

Immediate Steps to Take

Immediately update Google Chrome to version 88.0.4324.96 or later to patch the vulnerability. Educate users to exercise caution while downloading files from untrusted sources.

Long-Term Security Practices

Encourage the implementation of robust security protocols, including regular security awareness training, to prevent falling victim to social engineering tactics that exploit such vulnerabilities.

Patching and Updates

Regularly update browsers and software to the latest versions, as vendors often release patches to address security vulnerabilities like CVE-2021-21133, enhancing overall system security.