CVE-2023-34195 : What You Need to Know

An issue was discovered in SystemFirmwareManagementRuntimeDxe in Insyde InsydeH2O with kernel 5.0 through 5.5, allowing for arbitrary code execution in the DXE phase. It involves manipulating a UEFI variable named GetImageProgress to point to custom code.

Understanding CVE-2023-34195

This CVE involves a vulnerability in Insyde InsydeH2O firmware that can be exploited to execute arbitrary code during the DXE phase.

What is CVE-2023-34195?

The vulnerability arises from the implementation of the GetImage method, which mishandles the GetImageProgress runtime variable, potentially leading to arbitrary code execution.

The Impact of CVE-2023-34195

Exploitation of this vulnerability could allow an attacker to execute malicious code in the DXE phase, providing significant control over the affected system.

Technical Details of CVE-2023-34195

This section delves into the specific technical aspects of the CVE.

Vulnerability Description

The flaw lies in how the GetImage method interacts with the GetImageProgress runtime variable, enabling an attacker to point it to custom code for arbitrary execution.

Affected Systems and Versions

The issue affects Insyde InsydeH2O firmware with kernel versions ranging from 5.0 to 5.5.

Exploitation Mechanism

By setting the UEFI variable GetImageProgress from the operating system to custom code, an attacker can achieve arbitrary code execution during the DXE phase.

Mitigation and Prevention

Protecting systems from CVE-2023-34195 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply security patches provided by Insyde for the affected firmware versions.
Monitor for any signs of unauthorized code execution or system tampering.

Long-Term Security Practices

Regularly update firmware to the latest versions to mitigate known vulnerabilities.
Implement secure boot mechanisms and firmware integrity checks to prevent unauthorized code execution.

Patching and Updates

Stay informed about security updates from Insyde and promptly apply patches to address vulnerabilities.