CVE-2021-1790 : What You Need to Know

A vulnerability has been identified in macOS that could allow an attacker to execute arbitrary code by processing a specially crafted font. This issue has been addressed in macOS Big Sur 11.2 and Security Updates 2021-001 for Catalina and Mojave.

Understanding CVE-2021-1790

This CVE record highlights a critical out-of-bounds read vulnerability in macOS that can result in arbitrary code execution when handling a maliciously crafted font.

What is CVE-2021-1790?

CVE-2021-1790 is an out-of-bounds read vulnerability present in macOS versions prior to 11.2. By exploiting this flaw, an attacker could trigger arbitrary code execution by tricking a user into opening a specially crafted font.

The Impact of CVE-2021-1790

The impact of this vulnerability is severe as it enables attackers to remotely execute malicious code on affected systems, potentially leading to data theft, system compromise, or further exploitation of the target device.

Technical Details of CVE-2021-1790

This section delves into the specifics of the vulnerability, detailing its description, affected systems, and the mechanism through which it can be exploited.

Vulnerability Description

The vulnerability arises from inadequate input validation, resulting in an out-of-bounds read condition when processing malicious fonts. This flaw can be leveraged by threat actors to execute arbitrary code on vulnerable systems.

Affected Systems and Versions

CVE-2021-1790 impacts macOS versions prior to 11.2, making systems running these iterations susceptible to the exploit. Apple has released patches to address this vulnerability in macOS Big Sur 11.2 and security updates for macOS Catalina and Mojave.

Exploitation Mechanism

Exploiting CVE-2021-1790 involves crafting a malicious font that, when processed by the vulnerable macOS system, triggers the out-of-bounds read condition. Attackers can then insert and execute arbitrary code through this vector.

Mitigation and Prevention

To safeguard against CVE-2021-1790 and similar security risks, immediate steps should be taken while adopting long-term security practices and keeping systems up to date with necessary patches and updates.

Immediate Steps to Take

Users are advised to update their macOS systems to version 11.2 or later to mitigate the risk posed by CVE-2021-1790. Additionally, exercise caution when handling untrusted fonts or files sourced from unknown origins.

Long-Term Security Practices

Implementing robust security measures, such as network segmentation, access controls, and regular security awareness training, can enhance the overall security posture and resilience of an organization against potential threats.

Patching and Updates

Regularly applying security patches and updates provided by Apple is crucial to address known vulnerabilities like CVE-2021-1790. Stay informed about the latest security advisories and ensure timely installation of patches to protect your systems from emerging threats.