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Collaboration with Martin Himken

This post and the WinRE patching script on Martin's blog at https://manima.de are the result of a collaboration between Martin and I to help mutually improve our various efforts towards patching CVE-2022-41099.

security

This article relates to CVE-2022-41099 which is a vulnerability in the Windows Recovery Environment (WinRE) which could allow a successful attacker to bypass the BitLocker Device Encryption feature on the system storage device. An attacker with physical access to the target could exploit this vulnerability to gain access to encrypted data.

If you're running Windows 10 or 11 you might have come across CVE-2022-41099 which is a vulnerability in the Windows Recovery Environment (WinRE) which could allow a successful attacker to bypass BitLocker if they can boot the device to WinRE. This is a pretty serious vulnerability and Microsoft have released a patch for it. However, the patch is not applied automatically and you need to take action to apply it.

Martin Himken has written a script to patch the WinRE drivers and I've written a script to download and stage the patch and servicing stack update files. The link to Martin's blog is at the top of this post and will be repeated at the end.