CVE-2021-1736 Explained : Impact and Mitigation

This CVE-2021-1736 article provides insights into a security vulnerability found in macOS, affecting versions less than 11.2. The vulnerability allows for arbitrary code execution through a maliciously crafted image.

Understanding CVE-2021-1736

CVE-2021-1736 is an out-of-bounds read vulnerability in macOS that has been fixed in macOS Big Sur 11.2 and Security Update 2021-001 Catalina, Mojave. The issue stems from inadequate input validation when processing specially crafted images, potentially leading to arbitrary code execution.

What is CVE-2021-1736?

CVE-2021-1736 is an out-of-bounds read vulnerability in macOS that can be exploited by processing a specially crafted image. This flaw allows an attacker to execute arbitrary code on the targeted system.

The Impact of CVE-2021-1736

The impact of CVE-2021-1736 is severe as it enables attackers to execute arbitrary code on vulnerable systems through malicious image files. This could result in a complete compromise of the affected system's security.

Technical Details of CVE-2021-1736

This section covers vital technical details related to the CVE-2021-1736 vulnerability in macOS.

Vulnerability Description

CVE-2021-1736 is an out-of-bounds read flaw in macOS that arises from inadequate input validation, particularly when handling specially crafted images. By exploiting this vulnerability, an attacker can achieve arbitrary code execution on the target system.

Affected Systems and Versions

The vulnerability impacts macOS versions less than 11.2, making systems running older versions susceptible to exploitation. Users are advised to update to macOS Big Sur 11.2 or apply the necessary security updates to mitigate the risk.

Exploitation Mechanism

The exploitation of CVE-2021-1736 involves triggering the out-of-bounds read condition by enticing a user to open a maliciously crafted image file. This action allows the attacker to execute arbitrary code on the victim's machine.

Mitigation and Prevention

Here are the essential steps to mitigate and prevent the exploitation of CVE-2021-1736 on macOS systems.

Immediate Steps to Take

Users should update their macOS systems to version 11.2 or newer to address the CVE-2021-1736 vulnerability. Additionally, applying Security Update 2021-001 for Catalina and Mojave is crucial to prevent potential attacks.

Long-Term Security Practices

In the long term, users are advised to practice safe browsing habits and exercise caution when downloading or opening files from untrusted sources. Regularly updating the operating system and security patches is vital to stay protected against emerging threats.

Patching and Updates

Apple has released patches to fix CVE-2021-1736 in macOS Big Sur 11.2, Security Update 2021-001 for Catalina, and Mojave. Users are urged to promptly install these updates to safeguard their systems from potential exploitation.