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Microsoft is working to fix a known issue causing 0x80070643 errors when installing the KB5034441 security update that patches the CVE-2024-20666 BitLocker vulnerability.
While the security issue was resolved during this month's Patch Tuesday, deploying KB5034441 on systems with a Windows Recovery Environment (WinRE) partition that's too small will fail and mistakenly show generic '0x80070643 - ERROR_INSTALL_FAILURE' error messages instead of the correct CBS_E_INSUFFICIENT_DISK_SPACE error.
As a workaround, until a fix is available, the company provides customers with affected systems detailed—and quite complex—instructions on how to resize their WinRE partitions on its support website.
If creating a new WinRE partition large enough to complete this update fails, you can run reagentc /enable to re-enable the partition.
"Devices attempting to install the January 2024 Windows Recovery Environment update (KB5034441) might display an error related to the size of the Recovery Environment's partition. We are working on a resolution and will provide an update in an upcoming release," Microsoft says in an update to the Windows release health dashboard.
"It might be necessary to increase the size of the WinRE partition in order to avoid this issue and complete the installation. Note that 250 megabytes of free space is required in the recovery partition."
Microsoft has also released a PowerShell script that helps automate updating the WinRE partition to fix the CVE-2024-20666 flaw that allows for BitLocker encryption bypass.
The script addresses the known issue causing KB5034441 install failures on Windows 10 systems, leaving the devices vulnerable to attacks exploiting the BitLocker flaw that provides threat actors access to encrypted data.
When executed, it mounts the WinRE image, applies an architecture-specific Safe OS Dynamic Update you have to first download from the Windows Update Catalog, unmounts the image, and then reconfigures WinRE for BitLocker service if the BitLocker TPM protector is present.
After running the script, you should also use Microsoft's Show or Hide Tool to hide the KB5034441 update to prevent Windows Update from repeatedly trying to install the faulty update and displaying 0x80070643 errors.
After running the script, you may also have to use Microsoft's Show or Hide Tool to hide the KB5034441 update, so Windows Update won't try installing the buggy update and displaying an 0x80070643 error.
If you decide to resize the WinRE partition manually, it's highly recommended that you back up your data, given that there's always a chance that your system's partitions may be damaged during the process.
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I ran into that issue as well, and followed the instructions to manually resize my recovery partition to fix it, only to run into an error. Apparently if I had read more thoroughly I might have noticed where it said (in the block of seemingly unimportant text at the top of the page) that it only works if your recovery partition is the last partition on the drive. Fortunately I have spare USB flash drives, so I loaded a GParted live ISO onto one and booted into their little mini Debian boot "disk" where I was able to move the partitions where they needed to be for this nonsense to work. Thank God my partition layout was GPT, because if it was MBR apparently moving certain partitions (such as the one Windows is installed on) can cause your system to fail to boot. I think the warning from GParted said that was fixable, and pointed to the FAQ on their website, but I don't remember offhand what it said. Seriously Microsoft, your stupid Windows install disk is what created the partitions, and it's what decided to put the recovery partition first. You had to know that most Windows 10 users were limited to half a gig of total storage space on the recovery partition, and that a large percentage (if not most) of the recovery partitions with Window 10 installs were at the front of the drive, before you pushed this stupid update out. After all it was the geniuses that work for you that set the Windows 10 installer up that way to begin with, not to mention the Windows 7 and Windows 8 installers for people who upgraded instead of doing a fresh install like I did.
WHY are they even trying to install it on Windows Home machines to fix a BitLocker vulnerability when there is no BitLocker capability in Windows Home?
That was my question also, or what about those that do not have Bitlocker capability or a recovery partition? Something doesn't smell right.
Is this happening on Windows 10 Home? The issue happened on Windows 10 Pro for me.
This was my problem also, the WinRE partition was at the front of the disk, before the EFI and System partitions. Apparently earlier versions of Windows 10 placed the WinRE partition at the beginning of the disk. See the below link. Since I don't use Bitlocker, I just hid the update. https://www.bleepingcomputer.com/forums/t/793160/kb5034441-error-0x80070643/?p=5603245
FYI this is also effecting some Server 2022 based systems installing KB 5034439
I have Win10 Pro, but have always had BitLocker turned off on all my drives (too complicated for me, and just one more thing to go wrong). My hard disk does have a Q:\ recovery drive which is of course unused since BitLocker is off. Nonetheless, I am getting this same install error for KB5034441. So am I being forced to use BitLocker now, and have my drive encrypted?
This worked for me using this tool to " hide " the update " . Maybe it will work for you - https://www.majorgeeks.com/files/details/wushowhide.html
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