Researchers Uncover UEFI Secure Boot Bypass in 3 Microsoft Signed Boot Loaders

A security feature bypass vulnerability has been uncovered in three signed third-party Unified Extensible Firmware Interface (UEFI) boot loaders that allow bypass of the UEFI Secure Boot feature.
“These vulnerabilities can be exploited by mounting the EFI System Partition and replacing the existing bootloader with the vulnerable one, or modifying a UEFI variable to load the vulnerable loader

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