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Add SbatLevel_Variable.txt to document the various revocations #569

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Jun 21, 2023
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Add SbatLevel_Variable.txt to document the various revocations #569

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42 changes: 42 additions & 0 deletions SbatLevel_Variable.txt
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Original file line number Diff line number Diff line change
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In order to apply SBAT based revocations on systems that will never
run shim, code running in boot services context needs to set the
following variable:

Name: SbatLevel
Attributes: (EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS)
Namespace Guid: 605dab50-e046-4300-abb6-3dd810dd8b23

Variable content:

Initialized, no revocations:

sbat,1,2021030218

To Revoke GRUB binaries impacted by

* CVE-2021-3695
* CVE-2021-3696
* CVE-2021-3697
* CVE-2022-28733
* CVE-2022-28734
* CVE-2022-28735
* CVE-2022-28736
* CVE-2022-28737

sbat,1,2022052400
grub,2

To revoke the above and also grub binaries impacted by

* CVE-2022-2601
* CVE-2022-3775

sbat,1,2022111500
grub,3

An additonal bug was fixed in shim that was not considered exploitable
and can be revoked by setting:

sbat,1,2022111500
shim,2
grub,3