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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
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