CVE-2022-36338 : Security Advisory and Response
Discover the details of CVE-2022-36338, an SMM callout vulnerability in Insyde InsydeH2O firmware versions 5.0 through 5.5 allowing arbitrary code execution. Learn about the impact, affected systems, and mitigation steps.
An SMM callout vulnerability in the Insyde InsydeH2O firmware with kernel versions 5.0 through 5.5 allows attackers to execute arbitrary code by manipulating the UEFI boot service.
Understanding CVE-2022-36338
This CVE identifies a critical security flaw in the Insyde InsydeH2O firmware that can lead to arbitrary code execution.
What is CVE-2022-36338?
The vulnerability exists in the SMM driver FwBlockServiceSmm, allowing attackers to replace the UEFI boot service GetVariable pointer with malware, enabling software SMI generation.
The Impact of CVE-2022-36338
This vulnerability could be exploited by threat actors to execute malicious code, compromising the integrity and security of affected systems.
Technical Details of CVE-2022-36338
The following technical details shed light on the nature and scope of CVE-2022-36338.
Vulnerability Description
The flaw arises from an SMM callout vulnerability in the SMM driver FwBlockServiceSmm, creating SMM, which enables arbitrary code execution.
Affected Systems and Versions
Insyde InsydeH2O firmware versions 5.0 through 5.5 are impacted by this security issue.
Exploitation Mechanism
Attackers can craft a sophisticated attack by replacing the UEFI boot service GetVariable pointer with malware, facilitating the execution of malicious code and the generation of a software SMI.
Mitigation and Prevention
To safeguard systems from CVE-2022-36338, it is crucial to implement the following security measures.
Immediate Steps to Take
- Update the firmware to the latest version provided by Insyde.
- Monitor system behavior for any signs of unauthorized access or changes.
Long-Term Security Practices
- Employ application whitelisting to restrict the execution of unauthorized software.
- Conduct regular security audits and vulnerability assessments to proactively identify and address security risks.
Patching and Updates
Regularly apply security patches and updates released by Insyde to address known vulnerabilities and enhance system security.