CVE-2022-32953 : Security Advisory and Response

An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. DMA attacks on the SdHostDriver buffer used by SMM and non-SMM code could cause TOCTOU race-condition issues that could lead to corruption of SMRAM and escalation of privileges. This attack can be mitigated by using IOMMU protection for the ACPI runtime memory used for the command buffer. This attack can be mitigated by copying the link data to SMRAM before checking it and verifying that all pointers are within the buffer.

Understanding CVE-2022-32953

Insyde InsydeH2O with kernel 5.0 through 5.5 is vulnerable to DMA attacks that target the SdHostDriver buffer, potentially leading to SMRAM corruption and privilege escalation.

What is CVE-2022-32953?

CVE-2022-32953 is a security vulnerability found in Insyde InsydeH2O with specific kernel versions. DMA attacks on the SdHostDriver buffer may result in SMRAM corruption and possible privilege escalation.

The Impact of CVE-2022-32953

Exploitation of this vulnerability can allow attackers to corrupt SMRAM and escalate their privileges, posing a significant risk to the security and integrity of affected systems.

Technical Details of CVE-2022-32953

Insyde InsydeH2O with kernel 5.0 through 5.5 is susceptible to DMA attacks on the SdHostDriver buffer, creating a TOCTOU race-condition issue.

Vulnerability Description

The vulnerability arises from TOCTOU race-condition issues caused by DMA attacks on the SdHostDriver buffer, which can lead to SMRAM corruption and privilege escalation.

Affected Systems and Versions

The vulnerability affects Insyde InsydeH2O systems running kernel versions 5.0 through 5.5.

Exploitation Mechanism

Attackers exploit this vulnerability to target the SdHostDriver buffer, enabling them to corrupt SMRAM and potentially escalate their privileges.

Mitigation and Prevention

Implementing necessary steps to mitigate the impact of CVE-2022-32953 is crucial to safeguard systems from potential risks.

Immediate Steps to Take

To mitigate the risk, consider utilizing IOMMU protection for the ACPI runtime memory used for the command buffer and ensure link data is copied to SMRAM before verification.

Long-Term Security Practices

Enhancing overall system security through regular security assessments, patch management, and threat monitoring can help prevent and detect similar vulnerabilities.

Patching and Updates

Stay informed about security updates and patches provided by Insyde to address CVE-2022-32953 and other potential vulnerabilities.