CVE-2022-33908 : Security Advisory and Response

This article provides insights into CVE-2022-33908, a vulnerability related to DMA transactions targeting input buffers used for the SdHostDriver software SMI handler, leading to SMRAM corruption through a TOCTOU attack.

Understanding CVE-2022-33908

In this section, we will delve into the details of CVE-2022-33908.

What is CVE-2022-33908?

The vulnerability involves DMA transactions aimed at input buffers used for the software SMI handler in the SdHostDriver driver, causing SMRAM corruption through a TOCTOU attack.

The Impact of CVE-2022-33908

The impact of this vulnerability can result in SMRAM corruption, potentially leading to unauthorized access or manipulation of sensitive information.

Technical Details of CVE-2022-33908

Let's explore the technical aspects of CVE-2022-33908.

Vulnerability Description

The vulnerability arises from DMA transactions targeting specific input buffers, enabling attackers to exploit the TOCTOU race condition to corrupt SMRAM.

Affected Systems and Versions

The issue affects systems utilizing the SdHostDriver driver in kernels 5.2, 5.3, 5.4, and 5.5 with specific build versions mentioned in the fix.

Exploitation Mechanism

Attackers exploit the vulnerability by executing DMA transactions on input buffers for the SdHostDriver SMI handler, manipulating SMRAM contents.

Mitigation and Prevention

Learn how to mitigate and prevent the exploitation of CVE-2022-33908.

Immediate Steps to Take

Immediately update the affected kernels to the fixed versions mentioned - kernel 5.2: 05.27.25, kernel 5.3: 05.36.25, kernel 5.4: 05.44.25, kernel 5.5: 05.52.25.

Long-Term Security Practices

Implement secure coding practices, regularly update software components, and conduct security audits to enhance system resilience.

Patching and Updates

Stay vigilant for security patches released by relevant vendors and apply them promptly to protect against known vulnerabilities.