CVE-2021-21233 : Security Advisory and Response

Heap buffer overflow in ANGLE in Google Chrome on Windows prior to 90.0.4430.93 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Understanding CVE-2021-21233

This CVE identifies a heap buffer overflow vulnerability in Google Chrome that could be exploited by a remote attacker.

What is CVE-2021-21233?

CVE-2021-21233 is a heap buffer overflow vulnerability in ANGLE within Google Chrome, affecting versions prior to 90.0.4430.93. This security flaw enables a potential attacker to trigger heap corruption through a specifically crafted HTML page.

The Impact of CVE-2021-21233

The impact of this vulnerability is significant as it allows remote attackers to exploit heap corruption, potentially leading to arbitrary code execution, denial of service, or other malicious activities.

Technical Details of CVE-2021-21233

This section delves into the specifics of the vulnerability, affected systems, and exploitation mechanisms.

Vulnerability Description

The vulnerability arises from a heap buffer overflow issue in ANGLE within Google Chrome, impacting Windows systems running versions earlier than 90.0.4430.93. A remote attacker can leverage this flaw to corrupt the heap via specially crafted HTML content.

Affected Systems and Versions

Google Chrome versions prior to 90.0.4430.93 on Windows are vulnerable to this heap buffer overflow, potentially exposing users to exploitation.

Exploitation Mechanism

By enticing a user to visit a malicious website hosting a crafted HTML page, an attacker can trigger the heap corruption, leading to exploitation of the vulnerability.

Mitigation and Prevention

Protecting systems against CVE-2021-21233 involves immediate actions and long-term security practices.

Immediate Steps to Take

Users should update their Google Chrome browser to version 90.0.4430.93 or later to mitigate the vulnerability. Additionally, exercise caution while browsing to avoid visiting suspicious or untrusted websites.

Long-Term Security Practices

Implementing robust security measures, such as maintaining up-to-date software, utilizing security tools, and practicing safe browsing habits, can help prevent similar vulnerabilities in the future.

Patching and Updates

Regularly install security patches and updates released by Google for Chrome to address known vulnerabilities and enhance system security.