A GRUB security update has been released for Gentoo Linux.

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Gentoo Linux Security Advisory GLSA 202104-05
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  https://security.gentoo.org/
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Severity: Normal
Title: GRUB: Multiple vulnerabilities
Date: April 30, 2021
Bugs: #734654, #773991
ID: 202104-05

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Synopsis
========

Multiple vulnerabilities have been found in GRUB, the worst might allow
for circumvention of UEFI Secure Boot.

Background
==========

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

Affected packages
=================

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 sys-devel/grub < 2.06_rc1 >= 2.06_rc1

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-devel/grub-2.06_rc1"

After upgrading, make sure to run the grub-install command with options
appropriate for your system. See the GRUB Quick Start guide in the
references below for examples. Your system will be vulnerable until
this action is performed.

References
==========

[ 1 ] CVE-2020-10713
  https://nvd.nist.gov/vuln/detail/CVE-2020-10713
[ 2 ] CVE-2020-14308
  https://nvd.nist.gov/vuln/detail/CVE-2020-14308
[ 3 ] CVE-2020-14309
  https://nvd.nist.gov/vuln/detail/CVE-2020-14309
[ 4 ] CVE-2020-14310
  https://nvd.nist.gov/vuln/detail/CVE-2020-14310
[ 5 ] CVE-2020-14311
  https://nvd.nist.gov/vuln/detail/CVE-2020-14311
[ 6 ] CVE-2020-14372
  https://nvd.nist.gov/vuln/detail/CVE-2020-14372
[ 7 ] CVE-2020-15705
  https://nvd.nist.gov/vuln/detail/CVE-2020-15705
[ 8 ] CVE-2020-15706
  https://nvd.nist.gov/vuln/detail/CVE-2020-15706
[ 9 ] CVE-2020-15707
  https://nvd.nist.gov/vuln/detail/CVE-2020-15707
[ 10 ] CVE-2020-25632
  https://nvd.nist.gov/vuln/detail/CVE-2020-25632
[ 11 ] CVE-2020-25647
  https://nvd.nist.gov/vuln/detail/CVE-2020-25647
[ 12 ] CVE-2020-27749
  https://nvd.nist.gov/vuln/detail/CVE-2020-27749
[ 13 ] CVE-2020-27779
  https://nvd.nist.gov/vuln/detail/CVE-2020-27779
[ 14 ] CVE-2021-20225
  https://nvd.nist.gov/vuln/detail/CVE-2021-20225
[ 15 ] CVE-2021-20233
  https://nvd.nist.gov/vuln/detail/CVE-2021-20233
[ 16 ] GRUB Quick Start guide
  https://wiki.gentoo.org/wiki/GRUB2_Quick_Start

Availability
============

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

  https://security.gentoo.org/glsa/202104-05

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 2021 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