What went wrong with Windows 10’s botched KB4524244

Windows 10 cumulative update

Microsoft
recently pulled a Windows 10 security update ‘KB4524244’
after customers reported serious issues including boot failures
and BSOD. On February’s Patch Tuesday, Microsoft rolled out
KB4524244 to consumers using Windows 10 November 2019 Update,
May 2019 Update and other versions.

Microsoft’s updated documentation tells us that the patch fixes
an issue where third-party boot managers might expose computers
to a security vulnerability. According to Kaspersky, Microsoft
released this update to resolve a vulnerability that was
discovered in Kaspersky Rescue Disk.

The vulnerability was published disclosed in April 2019 and
Kaspersky resolved it in August 2019. The company says
vulnerability could have allowed attackers to run a custom
operating system on a device with Secure Boot technology by
exploiting Kaspersky Rescue Disk.

Microsoft’s security update includes additional patches to
protect people who use older versions of Kaspersky or may use
it in future.

It appears that Windows 10 KB4524244 adds old Kaspersky Rescue
Disk to PC’s Secure Boot and the changes to existing Secure
Boot restrictions broke other boot manager-associated programs
such as HP’s Sure Start.

In a statement, Kaspersky denied it’s involvement in Windows
10’s latest botched update. Kaspersky says Microsoft did not
contact the company about the changes included in the security
patch.

The problems could have been avoided had Microsoft tested its
patch on an HP machine with a Ryzen processor.

Microsoft has already pulled the patch and you can remove the
patch if it broke your computer.

You can uninstall the botched update by following these steps:

  • Type Control Panel in Start menu.
  • Click “Uninstall a Program” at the bottom.
  • Click “View Installed Updates” at the top left.
  • Select KB4524244 and look higher up for an uninstall
    button. Or you can right-click the patch and uninstall it.

KB4524244 won’t be re-released, but Microsoft might deliver
similar bug fixes in a future after collaborating with its
partners.

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