CVE-2021-30523 : Security Advisory and Response

Use after free in WebRTC in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to potentially exploit heap corruption via a crafted SCTP packet.

Understanding CVE-2021-30523

This CVE identifies a use after free vulnerability in Google Chrome that could be exploited by a remote attacker to trigger heap corruption through a specifically crafted SCTP packet.

What is CVE-2021-30523?

The CVE-2021-30523 is a use after free vulnerability found in WebRTC in Google Chrome versions prior to 91.0.4472.77. An attacker could potentially leverage this flaw to corrupt the heap memory by sending a maliciously crafted SCTP packet.

The Impact of CVE-2021-30523

The impact of CVE-2021-30523 is significant as it could allow a remote attacker to execute arbitrary code, leading to a potential compromise of the affected system's security and integrity.

Technical Details of CVE-2021-30523

This section outlines the specific technical details related to the CVE-2021-30523 vulnerability.

Vulnerability Description

The vulnerability stems from a use after free issue in WebRTC in Google Chrome versions preceding 91.0.4472.77. It arises due to improper handling of memory references after they have been freed, opening up the possibility of heap corruption.

Affected Systems and Versions

Google Chrome versions earlier than 91.0.4472.77 are affected by this vulnerability. Users utilizing these versions are at risk of being targeted by potential exploits leveraging this security flaw.

Exploitation Mechanism

Exploiting CVE-2021-30523 involves sending a specially crafted SCTP packet to the target system using a vulnerable version of Google Chrome. The malformed packet triggers a use after free condition, leading to heap corruption and potentially enabling the attacker to execute arbitrary code.

Mitigation and Prevention

Protecting systems from CVE-2021-30523 involves taking immediate and long-term security measures to ensure comprehensive defense against potential exploits.

Immediate Steps to Take

Users should update their Google Chrome browser to version 91.0.4472.77 or newer to mitigate the risk associated with CVE-2021-30523. Additionally, caution should be exercised when interacting with unknown or untrusted websites to prevent potential attack vectors.

Long-Term Security Practices

Implementing robust security practices, including maintaining up-to-date software versions, utilizing security tools, and staying informed about emerging threats, are essential for safeguarding systems from similar vulnerabilities in the future.

Patching and Updates

Regularly applying security patches and updates issued by Google Chrome is crucial in addressing known vulnerabilities like CVE-2021-30523. Timely patching helps in fortifying system defenses and reducing the likelihood of successful cyber attacks.