EFI: Do Not Import Certificates from UEFI Secure Boot for T2 Macs
Summary
GSD-2022-1003701: efi: Do not import certificates from UEFI Secure Boot for T2 Macs. Affects Kernel versions < b1cda6dd2c44771f042d65f0d17bec322ef99a0a. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that manages the system's resources and facilitates communication between hardware and software. It plays a crucial role in ensuring the security and stability of the system. The EFI (Extensible Firmware Interface) is a specification that defines an interface between the operating system and the firmware of a computer. It is responsible for initializing the hardware and booting the operating system. UEFI Secure Boot is a feature that ensures only trusted software is loaded during the boot process. T2 Macs are Mac computers equipped with the Apple T2 security chip, which provides hardware-based security features. This vulnerability affects the Kernel in Linux systems running on T2 Macs.
Vulnerability Detail
The vulnerability arises from the importation of certificates from UEFI Secure Boot for T2 Macs in the EFI component of the Kernel. Importing these certificates can potentially introduce security risks and compromise the integrity of the system. The impact and attack plausibility of this vulnerability have not been proven yet. However, it is crucial to address this issue to prevent any potential security breaches. The vulnerability has been fixed in Linux Kernel version v5.4.198 by commit b1cda6dd2c44771f042d65f0d17bec322ef99a0a.
How To Fix
No fixed version is published for this vulnerability.
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Conclusion
The vulnerability in the Kernel's EFI component that allows the importation of certificates from UEFI Secure Boot for T2 Macs can potentially introduce security risks and compromise the system's integrity. It is crucial to update the Linux Kernel to version v5.4.198 or later to fix this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The impact of this vulnerability is currently unknown as it has not been proven yet. However, importing certificates from UEFI Secure Boot for T2 Macs can potentially introduce security risks and compromise the system's integrity.
You can check if your system is running on a T2 Mac by running the 'system_profiler SPiBridgeDataType' command in the Terminal. If the output includes 'Model Name: Apple T2 chip', then your system is equipped with the T2 security chip.
Currently, there is no known workaround for this vulnerability. It is recommended to update the Linux Kernel to the fixed version as soon as possible.
The remote exploitability of this vulnerability is currently unknown as it has not been proven yet. However, it is important to address this issue to prevent any potential security breaches.
More information about the fix for this vulnerability can be found in the Linux Kernel repository. The specific commit b1cda6dd2c44771f042d65f0d17bec322ef99a0a addresses this issue.
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