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Gentoo Linux Security Advisory                           GLSA 202209-12
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                                           https://security.gentoo.org/
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 Severity: High
    Title: GRUB: Multiple Vulnerabilities
     Date: September 25, 2022
     Bugs: #850535, #835082
       ID: 202209-12

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Synopsis
=======
Multiple vulnerabilities have been discovered in GRUB, the worst of
which may allow for secureboot bypass.

Background
=========
GNU GRUB is a multiboot boot loader used by most Linux systems.

Affected packages
================
    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  sys-boot/grub              < 2.06                        >= 2.06

Description
==========
Multiple vulnerabilities have been discovered in GRUB. Please review the
CVE identifiers referenced below for details.

Impact
=====
Please review the referenced CVE identifiers for details.

Workaround
=========
There is no known workaround at this time.

Resolution
=========
All GRUB users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=sys-boot/grub-2.06-r3"

After upgrading, make sure to run the grub-install command with options
appropriate for your system. See the GRUB2 Gentoo Wiki page for
directions. Your system will be vulnerable until this action is
performed.

References
=========
[ 1 ] CVE-2021-3695
      https://nvd.nist.gov/vuln/detail/CVE-2021-3695
[ 2 ] CVE-2021-3696
      https://nvd.nist.gov/vuln/detail/CVE-2021-3696
[ 3 ] CVE-2021-3697
      https://nvd.nist.gov/vuln/detail/CVE-2021-3697
[ 4 ] CVE-2021-3981
      https://nvd.nist.gov/vuln/detail/CVE-2021-3981
[ 5 ] CVE-2022-28733
      https://nvd.nist.gov/vuln/detail/CVE-2022-28733
[ 6 ] CVE-2022-28734
      https://nvd.nist.gov/vuln/detail/CVE-2022-28734
[ 7 ] CVE-2022-28735
      https://nvd.nist.gov/vuln/detail/CVE-2022-28735
[ 8 ] CVE-2022-28736
      https://nvd.nist.gov/vuln/detail/CVE-2022-28736
[ 9 ] CVE-2022-28737
      https://nvd.nist.gov/vuln/detail/CVE-2022-28737

Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

 https://security.gentoo.org/glsa/202209-12

Concerns?
========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
======
Copyright 2022 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5/