![]() Kaspersky explained in a FAQ the Rescue Disk vulnerability was patched in August last year, and that internal tests showed the problems associated with the update were not caused by the bootloader. The researcher at the time used a loader associated with Kaspersky Rescue Disk 2018. In April last year, a researcher was able to demonstrate how bootloaders signed by Microsoft could be exploited to bypass UEFI Secure Boot on modern Windows systems. There is some discussion on Twitter suggesting that Microsoft is referring to the boot manager from Kaspersky Lab. The original update said the issue was present in a third-party UEFI boot manager but never identified it by name. Users who successfully installed the update will keep the update, but anyone who hasn't installed the update yet will have to wait for the "improved version," which will be released in a future update, Microsoft said. The uninstall process is available by going to the Windows 10 search box and typing update history to open the View Your Update History page. ![]() Microsoft said the issue affected a "subset of devices." Users who had problems should uninstall the update. After repairing the keys, the user tried rebooting and reinstalling the update, at which point the computer froze and required a hard reset. "On the reboot, my Secure Boot flagged me that the keys were corrupted," the user said. One user said the update corrupted the secure boot keys and locked the user out of the computer. The UEFI Secure Boot feature prevents unsigned or untrusted code (such as bootkits) from running during boot.Īfter users complained their devices became unusable after installing security update KB4524244 for Windows 10, Microsoft decided to pull KB4524244 and KB4502496-which addressed the same issue for Windows 8.1, Windows Server 2012, and an earlier version of Windows 10. UEFI connects the computer's firmware to the operating system and is in charge of code that runs when the system first boots up. The update, which was part of Microsoft's normal Patch Tuesday release this month, fixed a security vulnerability affecting third-party Unified Extensible Firmware Interface (UEFI) boot managers. Microsoft has removed the Windows security update addressing issues with third-party boot managers after users complained the updates caused their systems to stop working.
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