CVE-2021-3319 : Exploit Details and Defense Strategies

This CVE-2021-3319 affects Zephyr versions >= v2.4.0 due to incorrect 802154 frame validation, leading to a NULL Pointer Dereference and Attempt to Access Child of a Non-structure Pointer vulnerabilities.

Understanding CVE-2021-3319

This section delves into the details of CVE-2021-3319.

What is CVE-2021-3319?

CVE-2021-3319 is a Denial of Service (DOS) vulnerability in Zephyr. The vulnerability arises from incorrect 802154 frame validation for omitted source/destination addresses.

The Impact of CVE-2021-3319

The impact of CVE-2021-3319 is rated as MEDIUM severity. It allows attackers to exploit NULL Pointer Dereference and Attempt to Access Child of a Non-structure Pointer, potentially leading to system crashes and service unavailability.

Technical Details of CVE-2021-3319

This section covers the technical aspects of CVE-2021-3319.

Vulnerability Description

The vulnerability in Zephyr versions >= v2.4.0 results in a NULL Pointer Dereference and Attempt to Access Child of a Non-structure Pointer.

Affected Systems and Versions

Zephyr versions >= v2.4.0 are affected by this vulnerability, impacting systems running on these versions.

Exploitation Mechanism

The vulnerability can be exploited by attackers to trigger a Denial of Service condition by sending specially crafted 802154 frames.

Mitigation and Prevention

Here are the steps to mitigate and prevent exploitation of CVE-2021-3319.

Immediate Steps to Take

Immediately update the Zephyr software to a version that includes the patch for CVE-2021-3319. Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

Implement secure coding practices, conduct regular security audits, and stay informed about the latest security advisories from Zephyr to protect against future vulnerabilities.

Patching and Updates

Regularly apply security patches and updates provided by Zephyr to ensure the ongoing security of your systems.