VU#616257: Microsoft-signed UEFI shim bootloaders vulnerable to Secure Boot bypass (opens in new tab)  🖥️OS Development

Overview Microsoft-signed UEFI bootloaders of the open-source shim project, primarily from version 0.9 and earlier, were identified as vulnerable to Secure Boot bypass. To mitigate this risk, the affected bootloaders will be added to the Microsoft UEFI Forbidden Signature Database (DBX). Once the DBX update is applied, these bootloaders will no longer be trusted for execution during the boot process. An attacker could exploit these vulnerable shim bootloaders using a Bring Your Own Vulnerable...