CVE-2022-35893 : Security Advisory and Response

An SMM memory corruption vulnerability in the FvbServicesRuntimeDxe driver of Insyde InsydeH2O with kernel versions 5.0 through 5.5 can allow an attacker to write fixed or predictable data to SMRAM, potentially leading to privilege escalation to System Management Mode (SMM).

Understanding CVE-2022-35893

This CVE identifies a security issue in Insyde InsydeH2O firmware that affects the integrity of the System Management Mode memory.

What is CVE-2022-35893?

The vulnerability in the FvbServicesRuntimeDxe driver enables unauthorized modification of SMRAM contents, posing a risk of unauthorized privilege escalation.

The Impact of CVE-2022-35893

Exploiting this vulnerability could allow threat actors to gain elevated privileges to SMM, compromising the security and control of the system's most critical functions.

Technical Details of CVE-2022-35893

This section outlines specific technical aspects of the CVE for better understanding.

Vulnerability Description

The vulnerability allows attackers to alter SMRAM contents through the FvbServicesRuntimeDxe module, potentially leading to unauthorized access and control over critical system operations.

Affected Systems and Versions

Insyde InsydeH2O firmware with kernel versions 5.0 through 5.5 are affected by this vulnerability, leaving systems running these versions at risk of exploitation.

Exploitation Mechanism

By leveraging the SMM memory corruption flaw, attackers can inject fixed or predictable data into SMRAM, paving the way for unauthorized privilege escalation.

Mitigation and Prevention

Protecting systems against CVE-2022-35893 requires immediate action and long-term security practices.

Immediate Steps to Take

Update the InsydeH2O firmware to the latest version to address the vulnerability effectively.
Implement strict access controls and monitoring measures to detect unauthorized changes to SMRAM.

Long-Term Security Practices

Regularly monitor security advisories and updates from the Insyde vendor to stay informed about emerging threats and patches.
Employ defense-in-depth strategies to mitigate risks associated with firmware vulnerabilities.

Patching and Updates

Apply patches and security updates released by Insyde promptly to remediate CVE-2022-35893 and strengthen the overall security posture of the system.