Attackers would have to break into your house first and then attempt to bypass the bootloader of your operating system. For the typical home or consumer user, this risk is low. They have to have physical access to the machine.In this specific case, the attacker has to have one of two things to occur. I don’t recommend ignoring or blocking updates unless the risk of side effects is greater than the patch itself. After successfully exploiting this vulnerability, the attacker could disable further code integrity checks, thereby allowing arbitrary executables and drivers to be loaded onto the target device.” The attacker could install an affected GRUB and run arbitrary boot code on the target device. This security update addresses the vulnerability by adding the signatures of the known vulnerable UEFI modules to the DBX.”Īs noted in the Microsoft guidance: “To exploit this vulnerability, an attacker would need to have administrative privileges or physical access on a system where Secure Boot is configured to trust the Microsoft Unified Extensible Firmware Interface (UEFI) Certificate Authority (CA). An attacker who successfully exploited the vulnerability might bypass secure boot and load untrusted software. This specific update deals with a security risk where “a security feature bypass vulnerability exists in secure boot. But here's the thing: not all machines share the same risk factors.
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