CVE-2022-33905 : What You Need to Know

A TOCTOU attack poses a threat to AhciBusDxe software SMI handler due to DMA transactions aimed at input buffers potentially leading to SMRAM corruption. Learn more about the impact, technical details, and mitigation strategies below.

Understanding CVE-2022-33905

This section delves into the specifics of CVE-2022-33905.

What is CVE-2022-33905?

DMA transactions targeted at input buffers for AhciBusDxe software SMI handler could result in SMRAM corruption, as identified by Insyde engineering.

The Impact of CVE-2022-33905

SMRAM corruption through TOCTOU attack is the primary consequence, emphasizing the critical nature of this vulnerability.

Technical Details of CVE-2022-33905

Explore the technical aspects of CVE-2022-33905 to understand its implications further.

Vulnerability Description

AhciBusDxe driver is susceptible to SMRAM corruption caused by DMA transactions aimed at the software SMI handler's input buffers.

Affected Systems and Versions

All versions of the AhciBusDxe driver up to kernel 5.5: 05.52.23 are impacted by this vulnerability.

Exploitation Mechanism

The exploitation involves directing DMA transactions towards specific input buffers, triggering SMRAM corruption.

Mitigation and Prevention

Discover the essential steps to mitigate and prevent the risks associated with CVE-2022-33905.

Immediate Steps to Take

Ensure timely application of the kernel patches for versions 5.2, 5.3, 5.4, and 5.5 to safeguard against SMRAM corruption.

Long-Term Security Practices

Implement robust security measures to prevent TOCTOU attacks and enhance system resilience against similar vulnerabilities.

Patching and Updates

Stay updated with security patches and kernel updates to address known vulnerabilities and strengthen system security.