CVE-2021-30908 : Security Advisory and Response

This article provides an overview of CVE-2021-30908, detailing the authentication issue addressed in macOS and its impact on system security.

Understanding CVE-2021-30908

CVE-2021-30908 is a security vulnerability in Apple's macOS operating system that allows a local attacker to view the previous user's desktop from the fast user switching screen.

What is CVE-2021-30908?

Apple's macOS versions prior to macOS Monterey 12.0.1 and macOS Big Sur 11.6 are affected by an authentication issue related to state management. The vulnerability could enable a local attacker to access the previous user's desktop.

The Impact of CVE-2021-30908

The vulnerability poses a security risk as it allows unauthorized access to sensitive user information and activities. Attackers exploiting this flaw can view the desktop of the previously logged-in user, compromising privacy and potentially sensitive data.

Technical Details of CVE-2021-30908

The technical details of CVE-2021-30908 include:

Vulnerability Description

The vulnerability arises from a flaw in state management within macOS, specifically affecting versions prior to macOS Monterey 12.0.1 and macOS Big Sur 11.6.1. This issue allows a local attacker to view the desktop of the previous user when leveraging the fast user switching feature.

Affected Systems and Versions

Affected Product: macOS
Affected Versions: macOS versions less than 12.0 and 11.6

Exploitation Mechanism

Exploiting CVE-2021-30908 involves leveraging the fast user switching screen on vulnerable macOS systems, enabling a local attacker to gain unauthorized access to the previous user's desktop.

Mitigation and Prevention

Protecting your system against CVE-2021-30908 requires immediate action and long-term security practices.

Immediate Steps to Take

Update to macOS Monterey 12.0.1 or macOS Big Sur 11.6.1 to mitigate the vulnerability.
Avoid leaving your system unattended or vulnerable to unauthorized users.

Long-Term Security Practices

Regularly update your macOS system to the latest versions to address security vulnerabilities.
Use strong authentication methods and avoid sharing user accounts on shared devices.

Patching and Updates

Stay informed about security updates from Apple and apply patches promptly to safeguard your system against known vulnerabilities.