CVE-2022-32955 : What You Need to Know

An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5 that could lead to privilege escalation and SMRAM corruption.

Understanding CVE-2022-32955

This CVE outlines a vulnerability in Insyde InsydeH2O which, if exploited, could result in privilege escalation and SMRAM corruption.

What is CVE-2022-32955?

CVE-2022-32955 is a vulnerability in Insyde InsydeH2O with kernel versions 5.0 through 5.5. It is caused by TOCTOU race-condition issues that could allow malicious actors to corrupt SMRAM and escalate privileges.

The Impact of CVE-2022-32955

If successfully exploited, this vulnerability could lead to unauthorized privilege escalation and corruption of SMRAM, posing a serious security risk to affected systems.

Technical Details of CVE-2022-32955

This section provides more insights into the vulnerability and its implications.

Vulnerability Description

The vulnerability arises from DMA attacks on the NvmExpressDxe buffer used by SMM and non-SMM code, creating TOCTOU race-condition issues.

Affected Systems and Versions

Insyde InsydeH2O with kernel versions 5.0 through 5.5 are affected by this vulnerability.

Exploitation Mechanism

Malicious actors could exploit this vulnerability by causing TOCTOU race-condition issues, leading to SMRAM corruption and privilege escalation.

Mitigation and Prevention

To safeguard systems against CVE-2022-32955, certain mitigation strategies need to be implemented.

Immediate Steps to Take

Implement IOMMU protection for the ACPI runtime memory used for the command buffer.
Copy the link data to SMRAM before checking it and verify that all pointers are within the buffer.

Long-Term Security Practices

Regularly monitor and update the system to mitigate any emerging vulnerabilities.
Conduct security assessments and audits to identify and address potential weaknesses.

Patching and Updates

Stay informed about security patches and updates released by Insyde to address CVE-2022-32955.