CVE-2021-30966 Explained : Impact and Mitigation

A logic issue affecting Apple's watchOS, iOS, iPadOS, macOS, and tvOS has been identified and fixed by Apple. This vulnerability could lead to user traffic being leaked to a proxy server despite PAC configurations. Here's what you need to know about CVE-2021-30966.

Understanding CVE-2021-30966

This vulnerability, with CVE-2021-30966, involves a logic issue that could potentially leak user traffic to a proxy server even when PAC configurations are in place.

What is CVE-2021-30966?

CVE-2021-30966 is a logic issue fixed by Apple in macOS Monterey 12.1, watchOS 8.3, iOS 15.2, and iPadOS 15.2. Despite proper PAC configurations, there was a risk of user traffic being leaked to a proxy server.

The Impact of CVE-2021-30966

The impact of this vulnerability is significant as it could lead to the unintended exposure of user traffic to a proxy server, potentially resulting in data leakage or interception.

Technical Details of CVE-2021-30966

This section delves into the technical details surrounding CVE-2021-30966.

Vulnerability Description

The vulnerability involves a logic issue that allowed user traffic to be leaked to a proxy server despite the presence of PAC configurations.

Affected Systems and Versions

watchOS: Less than version 8.3
iOS and iPadOS: Less than version 15.2
macOS: Less than version 12.1 and less than version 15.2

Exploitation Mechanism

The exploitation of CVE-2021-30966 could occur when user devices with the affected versions and configurations connect to networks or servers.

Mitigation and Prevention

To address CVE-2021-30966 and prevent its exploitation, users and organizations can take the following steps.

Immediate Steps to Take

Update affected Apple devices to the patched versions: macOS Monterey 12.1, watchOS 8.3, iOS 15.2, and iPadOS 15.2.
Monitor network activity for any signs of traffic leakage.

Long-Term Security Practices

Regularly update devices and systems to the latest software versions.
Implement network security measures to detect and prevent unauthorized traffic redirection.

Patching and Updates

Stay informed about security patches and updates released by Apple to address vulnerabilities like CVE-2021-30966.