CVE-2022-33982 : Vulnerability Insights and Analysis

DMA attacks on the parameter buffer used by the Int15ServiceSmm software SMI handler could lead to a TOCTOU attack on the SMI handler and lead to corruption of SMRAM. This issue was discovered by Insyde engineering during a security review and affects certain versions of Kernel. Find out more about the impact, technical details, and mitigation steps below.

Understanding CVE-2022-33982

This section delves into the details of CVE-2022-33982, including its impact and technical aspects.

What is CVE-2022-33982?

CVE-2022-33982 involves DMA attacks on the parameter buffer used by the Int15ServiceSmm software SMI handler, potentially resulting in a TOCTOU attack on the SMI handler and SMRAM corruption.

The Impact of CVE-2022-33982

The vulnerability can be exploited to corrupt SMRAM, affecting system integrity and security.

Technical Details of CVE-2022-33982

Explore the specifics of CVE-2022-33982 to understand the vulnerability and affected systems.

Vulnerability Description

The vulnerability arises from DMA attacks on the parameter buffer utilized by the Int15ServiceSmm software SMI handler, leading to potential TOCTOU attacks.

Affected Systems and Versions

The vulnerability impacts Kernel versions 5.2, 5.3, 5.4, and 5.5, with specific build numbers mentioned.

Exploitation Mechanism

The DMA attacks on the software SMI handler parameter buffer can facilitate TOCTOU attacks, ultimately corrupting SMRAM.

Mitigation and Prevention

Take necessary steps to mitigate the risks associated with CVE-2022-33982 and enhance system security.

Immediate Steps to Take

Apply the provided Kernel patches to address the vulnerability and prevent potential DMA attacks.

Long-Term Security Practices

Implement secure coding practices and conduct regular security reviews to mitigate similar vulnerabilities in the future.

Patching and Updates

Stay informed about security updates for Kernel versions 5.2, 5.3, 5.4, and 5.5 to safeguard systems against potential attacks.