CVE-2021-30759 : Exploit Details and Defense Strategies

A stack overflow vulnerability has been identified and addressed in Apple products, affecting various versions of iOS, macOS, watchOS, tvOS, and Security Updates. The vulnerability could allow an attacker to execute arbitrary code by processing a maliciously crafted font file.

Understanding CVE-2021-30759

This CVE details a stack overflow vulnerability in Apple products, allowing arbitrary code execution through a crafted font file.

What is CVE-2021-30759?

CVE-2021-30759 addresses a stack overflow issue in iOS, macOS, watchOS, tvOS, and various security updates issued by Apple. The vulnerability arises from processing specially crafted font files.

The Impact of CVE-2021-30759

The vulnerability could be exploited by an attacker to execute arbitrary code on affected systems, leading to potential security breaches and unauthorized access.

Technical Details of CVE-2021-30759

The CVE-2021-30759 vulnerability is characterized by a stack overflow that has been mitigated through enhanced input validation in iOS 14.7, macOS Big Sur 11.5, watchOS 7.6, tvOS 14.7, Security Update 2021-005 Mojave, and Security Update 2021-004 Catalina.

Vulnerability Description

The issue is related to processing maliciously crafted font files, which can trigger the stack overflow and allow attackers to execute arbitrary code.

Affected Systems and Versions

Security Update - Catalina: Less than 2021
iOS: Less than 14.7
macOS: Less than 11.5 and 2021

Exploitation Mechanism

By processing a specially crafted font file, attackers can exploit the vulnerability to inject and execute arbitrary code on affected Apple products.

Mitigation and Prevention

To secure systems against CVE-2021-30759, immediate action is required along with long-term security practices and timely patching.

Immediate Steps to Take

Update devices to the latest iOS and macOS versions where the vulnerability is patched.
Implement security updates promptly to mitigate the risk of exploitation.

Long-Term Security Practices

Exercise caution while downloading and opening files from untrusted sources.
Regularly update software and security patches to stay protected against known vulnerabilities.

Patching and Updates

Apple has released patches for the affected products. Ensure all devices are updated with the latest security updates to prevent exploitation of the vulnerability.