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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Low: grub2 security, bug fix, and enhancement update
Advisory ID:       RHSA-2022:2110-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2022:2110
Issue date:        2022-05-10
CVE Names:         CVE-2021-3981 
=====================================================================

1. Summary:

An update for grub2 is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact
of Low. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux BaseOS (v. 8) - aarch64, noarch, ppc64le, x86_64

3. Description:

The grub2 packages provide version 2 of the Grand Unified Boot Loader
(GRUB), a highly configurable and customizable boot loader with modular
architecture. The packages support a variety of kernel formats, file
systems, computer architectures, and hardware devices.

Security Fix(es):

* grub2: Incorrect permission in grub.cfg allow unprivileged user to read
the file content (CVE-2021-3981)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 8.6 Release Notes linked from the References section.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1809246 - [RFE] GRUB does not consider information from proxy dhcp server
1899903 - grub2-mkconfig is never run on kernel upgrade even if GRUB_ENABLE_BLSCFG=false
1914575 - grub-boot-success.service should not be started inside systemd-nspawn container
2016269 - RPM grub2-tools-minimal is shipping prelink config files although prelink is absent in rhel8
2020927 - GRUB_TERMINAL_INPUT=at_keyboard makes grub stay on boot menu instead of starting the timeout
2024170 - CVE-2021-3981 grub2: Incorrect permission in grub.cfg allow unprivileged user to read the file content
2048904 - Cannot EFI chainload onto local disk when EFI partition is in Software Raid
2061252 - grub on OpenFirmware : search --hint-ieee1275= does not work
2069157 - grub2 signed by Red Hat Test Certificate

6. Package List:

Red Hat Enterprise Linux BaseOS (v. 8):

Source:
grub2-2.02-123.el8.src.rpm

aarch64:
grub2-debuginfo-2.02-123.el8.aarch64.rpm
grub2-debugsource-2.02-123.el8.aarch64.rpm
grub2-efi-aa64-2.02-123.el8.aarch64.rpm
grub2-efi-aa64-cdboot-2.02-123.el8.aarch64.rpm
grub2-tools-2.02-123.el8.aarch64.rpm
grub2-tools-debuginfo-2.02-123.el8.aarch64.rpm
grub2-tools-extra-2.02-123.el8.aarch64.rpm
grub2-tools-extra-debuginfo-2.02-123.el8.aarch64.rpm
grub2-tools-minimal-2.02-123.el8.aarch64.rpm
grub2-tools-minimal-debuginfo-2.02-123.el8.aarch64.rpm

noarch:
grub2-common-2.02-123.el8.noarch.rpm
grub2-efi-aa64-modules-2.02-123.el8.noarch.rpm
grub2-efi-ia32-modules-2.02-123.el8.noarch.rpm
grub2-efi-x64-modules-2.02-123.el8.noarch.rpm
grub2-pc-modules-2.02-123.el8.noarch.rpm
grub2-ppc64le-modules-2.02-123.el8.noarch.rpm

ppc64le:
grub2-debuginfo-2.02-123.el8.ppc64le.rpm
grub2-debugsource-2.02-123.el8.ppc64le.rpm
grub2-ppc64le-2.02-123.el8.ppc64le.rpm
grub2-tools-2.02-123.el8.ppc64le.rpm
grub2-tools-debuginfo-2.02-123.el8.ppc64le.rpm
grub2-tools-extra-2.02-123.el8.ppc64le.rpm
grub2-tools-extra-debuginfo-2.02-123.el8.ppc64le.rpm
grub2-tools-minimal-2.02-123.el8.ppc64le.rpm
grub2-tools-minimal-debuginfo-2.02-123.el8.ppc64le.rpm

x86_64:
grub2-debuginfo-2.02-123.el8.x86_64.rpm
grub2-debugsource-2.02-123.el8.x86_64.rpm
grub2-efi-ia32-2.02-123.el8.x86_64.rpm
grub2-efi-ia32-cdboot-2.02-123.el8.x86_64.rpm
grub2-efi-x64-2.02-123.el8.x86_64.rpm
grub2-efi-x64-cdboot-2.02-123.el8.x86_64.rpm
grub2-pc-2.02-123.el8.x86_64.rpm
grub2-tools-2.02-123.el8.x86_64.rpm
grub2-tools-debuginfo-2.02-123.el8.x86_64.rpm
grub2-tools-efi-2.02-123.el8.x86_64.rpm
grub2-tools-efi-debuginfo-2.02-123.el8.x86_64.rpm
grub2-tools-extra-2.02-123.el8.x86_64.rpm
grub2-tools-extra-debuginfo-2.02-123.el8.x86_64.rpm
grub2-tools-minimal-2.02-123.el8.x86_64.rpm
grub2-tools-minimal-debuginfo-2.02-123.el8.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2021-3981
https://access.redhat.com/security/updates/classification/#low
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.6_release_notes/

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2022 Red Hat, Inc.
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