CVE-2023-30633 : Security Advisory and Response

An issue was discovered in TrEEConfigDriver in Insyde InsydeH2O with kernel 5.0 through 5.5 that can report false TPM PCR values, potentially masking malware activity. This vulnerability affects devices using Platform Configuration Registers (PCRs) to ensure secure boot processes.

Understanding CVE-2023-30633

This CVE highlights a security vulnerability in Insyde InsydeH2O that can allow a device to appear healthy by manipulating PCR values.

What is CVE-2023-30633?

CVE-2023-30633 involves the reporting of false TPM PCR values in TrEEConfigDriver in Insyde InsydeH2O, enabling a device to impersonate a secure one by extending arbitrary values into PCR banks.

The Impact of CVE-2023-30633

This vulnerability requires physical access to the target device or compromise of user credentials, potentially allowing malware to go undetected and posing significant security risks.

Technical Details of CVE-2023-30633

The following technical aspects of CVE-2023-30633 shed light on the nature and implications of this vulnerability.

Vulnerability Description

The flaw in TrEEConfigDriver can lead to the spoofing of TPM PCR values, undermining the integrity of PCR banks and enabling the masking of malicious activities.

Affected Systems and Versions

Devices running Insyde InsydeH2O with kernel versions 5.0 through 5.5 are vulnerable to this exploit, potentially impacting a wide range of systems.

Exploitation Mechanism

Exploiting this CVE requires either physical access to the victim's device or the compromise of user credentials, allowing threat actors to manipulate PCR values.

Mitigation and Prevention

Understanding how to mitigate and prevent the exploitation of CVE-2023-30633 is crucial for maintaining the security of affected devices.

Immediate Steps to Take

Owners of devices running the impacted versions should exercise caution with physical device access and promptly implement security measures to prevent unauthorized tampering with PCR values.

Long-Term Security Practices

Establishing and enforcing robust security protocols, including limiting physical access to devices and safeguarding user credentials, can help mitigate the risks associated with CVE-2023-30633.

Patching and Updates

Users are advised to stay vigilant for security updates and patches released by Insyde for affected systems to address and remediate the vulnerabilities identified in CVE-2023-30633.