A GRUB security update has been released for Gentoo Linux.

GLSA 202209-12 : GRUB: Multiple Vulnerabilities

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory GLSA 202209-12
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  https://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Severity: High
Title: GRUB: Multiple Vulnerabilities
Date: September 25, 2022
Bugs: #850535, #835082
ID: 202209-12

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

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