CVE-2022-35894 : Exploit Details and Defense Strategies

An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. The SMI handler for the FwBlockServiceSmm driver uses an untrusted pointer as the location to copy data to an attacker-specified buffer, leading to information disclosure.

Understanding CVE-2022-35894

This CVE highlights a vulnerability in Insyde InsydeH2O with kernel versions 5.0 through 5.5, where an attacker can exploit the SMI handler for the FwBlockServiceSmm driver to disclose sensitive information.

What is CVE-2022-35894?

CVE-2022-35894 is a security flaw in the Insyde InsydeH2O firmware with kernel versions ranging from 5.0 to 5.5. The vulnerability arises from the SMI handler's improper use of untrusted pointers when copying data to a specified buffer.

The Impact of CVE-2022-35894

This vulnerability allows an attacker to potentially access confidential information stored in the system's memory, leading to information disclosure and posing a risk to data privacy and system integrity.

Technical Details of CVE-2022-35894

This section outlines the specific technical aspects of the CVE.

Vulnerability Description

The vulnerability in CVE-2022-35894 stems from the use of untrusted pointers by the SMI handler for the FwBlockServiceSmm driver, enabling attackers to copy data to a buffer of their choice.

Affected Systems and Versions

Insyde InsydeH2O firmware versions 5.0 through 5.5 are impacted by this vulnerability, potentially affecting systems that utilize these versions.

Exploitation Mechanism

Attackers can exploit this vulnerability by leveraging the SMI handler for the FwBlockServiceSmm driver to direct data to a buffer they control, allowing them to retrieve sensitive information.

Mitigation and Prevention

Protecting systems from CVE-2022-35894 involves taking immediate steps and adopting long-term security measures.

Immediate Steps to Take

System administrators should consider implementing access controls, monitoring for suspicious activities, and applying relevant security patches to mitigate the risk associated with this vulnerability.

Long-Term Security Practices

In the long term, organizations should prioritize regular security assessments, conduct thorough code reviews, and stay informed about firmware updates and security best practices.

Patching and Updates

It is crucial to apply the latest patches and updates provided by Insyde to address CVE-2022-35894 and enhance the overall security posture of systems.