CVE-2021-21109 : Exploit Details and Defense Strategies

A detailed overview of CVE-2021-21109 impacting Google Chrome versions prior to 87.0.4280.141, allowing for a sandbox escape via a crafted HTML page.

Understanding CVE-2021-21109

This section explores the vulnerability, its impacts, technical details, as well as mitigation strategies.

What is CVE-2021-21109?

CVE-2021-21109 is a 'Use after free' vulnerability in Google Chrome prior to version 87.0.4280.141, which could be exploited by a remote attacker to potentially escape the sandbox environment through a maliciously crafted HTML page.

The Impact of CVE-2021-21109

The vulnerability poses a significant risk as it allows an attacker who has compromised the renderer process in Chrome to execute arbitrary code outside the sandbox through a specially designed HTML page.

Technical Details of CVE-2021-21109

Let's delve deeper into the technical aspects and implications of this security flaw.

Vulnerability Description

The vulnerability arises from the improper handling of memory in the payments feature of Google Chrome versions prior to 87.0.4280.141, enabling threat actors to abuse this flaw for a sandbox escape attack.

Affected Systems and Versions

Google Chrome versions below 87.0.4280.141 are susceptible to this 'Use after free' vulnerability, putting users of these versions at risk of exploitation.

Exploitation Mechanism

By exploiting this vulnerability, an attacker with control over the renderer process can manipulate memory allocation to execute malicious code and break out of the browser's sandbox.

Mitigation and Prevention

To safeguard systems from potential exploitation, it is crucial to follow immediate mitigation steps and implement long-term security practices.

Immediate Steps to Take

Users are advised to update their Google Chrome browsers to version 87.0.4280.141 or newer to patch the vulnerability and prevent potential attacks.

Long-Term Security Practices

Practicing good security hygiene, such as regular software updates, security awareness training, and safe browsing habits, can enhance overall defense against similar vulnerabilities.

Patching and Updates

Regularly applying security patches, staying informed about security advisories, and promptly installing updates will help in maintaining a secure browsing environment.