CVE-2021-36324 : Exploit Details and Defense Strategies

A detailed overview of the Dell BIOS vulnerability (CVE-2021-36324) affecting versions less than 1.13.0.

Understanding CVE-2021-36324

This section will cover the impact, technical details, and mitigation strategies related to CVE-2021-36324.

What is CVE-2021-36324?

The CVE-2021-36324 vulnerability in Dell BIOS involves improper input validation, allowing a local authenticated malicious user to potentially execute arbitrary code by invoking System Management Interrupts (SMIs) in SMRAM.

The Impact of CVE-2021-36324

The vulnerability has a CVSS base score of 7.5, categorizing it as a high severity issue. It has a high impact on confidentiality, integrity, and availability. The attack complexity is high, with privileges required for exploitation.

Technical Details of CVE-2021-36324

This section delves into the vulnerability description, affected systems, and the exploitation mechanism.

Vulnerability Description

The vulnerability arises due to improper input validation in Dell BIOS, facilitating arbitrary code execution via SMI in SMRAM.

Affected Systems and Versions

The issue impacts Dell systems running CPG BIOS versions less than 1.13.0.

Exploitation Mechanism

A local authenticated user can exploit the vulnerability by leveraging SMIs to execute arbitrary code in SMRAM.

Mitigation and Prevention

This section covers immediate steps to take and long-term security practices to safeguard against CVE-2021-36324.

Immediate Steps to Take

Users should apply security updates promptly, monitor system behavior, and restrict local access to mitigate the risk of exploitation.

Long-Term Security Practices

Implementing least privilege access, regular security training for staff, and maintaining up-to-date BIOS versions can enhance long-term security posture.

Patching and Updates

Dell has released patches to address the vulnerability. Ensure timely installation of these updates to protect systems from CVE-2021-36324.