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What does Secure Boot protect?
When enabled and fully configured, Secure Boot helps a computer resist attacks and infection from malware. Secure Boot detects tampering with boot loaders, key operating system files, and unauthorized option ROMs by validating their digital signatures.
Can UEFI be hacked?
The recently discovered UEFI spyware makes it possible for criminals to directly deliver hacking tools or malware to the infected computer from this pre-boot environment. These tools could allow hackers to steal documents, log keystrokes to steal passwords, and exfiltrate the stolen info via the Internet.
Is it safe to turn off Secure Boot?
Secure Boot helps to make sure that your PC boots using only firmware that is trusted by the manufacturer. After disabling Secure Boot and installing other software and hardware, you may need to restore your PC to the factory state to re-activate Secure Boot. Be careful when changing BIOS settings.
How does UEFI Secure Boot prevent a reboot?
UEFI Secure Boot would prevent that, because your machine will only run the bootloader if it is signed, and the attacker’s modified bootloader won’t have a valid signature. In other words, with UEFI Secure Boot, you should be confident that, once you reboot, you’re now running a valid and trusted bootloader and OS kernel.
What does secure boot do in Windows 8?
Secure Boot is a UEFI (Unified Extensible Firmware Interface) feature that should prevent unauthorized programs or drivers from being loaded during the boot process of devices running Windows 8 and later. The feature is designed to ensure that every component loaded at boot is signed and validated.
What to do if secure boot is disabled?
On systems where Secure Boot is locked down and cannot be disabled (e.g. Windows RT, HoloLens, Windows Phone), configuration changes can be made using policies, signed files loaded by the boot manager (bootmgr) from a UEFI variable. There are some boot loader executables (EFI files) signed by Microsoft that can be used to provision such policies.
Are there any security patches for secure boot?
The first patch was released by the company in July with the MS16-094 bulletin rated important. Microsoft noted in an advisory that the flaw (CVE-2016-3287) can be exploited to bypass Secure Boot security features by installing an affected policy on the targeted device.