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

Synopsis:          Moderate: grub2 security and bug fix update
Advisory ID:       RHSA-2023:0048-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2023:0048
Issue date:        2023-01-09
CVE Names:         CVE-2022-2601 CVE-2022-3775 
=====================================================================

1. Summary:

An update for grub2 is now available for Red Hat Enterprise Linux 8.6
Extended Update Support.

Red Hat Product Security has rated this update as having a security impact
of Moderate. 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 EUS (v.8.6) - 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: Buffer overflow in grub_font_construct_glyph() can lead to
out-of-bound write and possible secure boot bypass (CVE-2022-2601)

* grub2: Heap based out-of-bounds write when redering certain unicode
sequences (CVE-2022-3775)

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.

Bug Fix(es):

* [RHEL8.6][SecureBoot][Denali/P10] boot process stops at grub prompt after
copying the signed grub to prep partition (BZ#2108049)

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/):

2112975 - CVE-2022-2601 grub2: Buffer overflow in grub_font_construct_glyph()
 can lead to out-of-bound write and possible secure boot bypass
2138880 - CVE-2022-3775 grub2: Heap based out-of-bounds write when redering
 certain unicode sequences

6. Package List:

Red Hat Enterprise Linux BaseOS EUS (v.8.6):

Source:
grub2-2.02-123.el8_6.12.src.rpm

aarch64:
grub2-debuginfo-2.02-123.el8_6.12.aarch64.rpm
grub2-debugsource-2.02-123.el8_6.12.aarch64.rpm
grub2-efi-aa64-2.02-123.el8_6.12.aarch64.rpm
grub2-efi-aa64-cdboot-2.02-123.el8_6.12.aarch64.rpm
grub2-tools-2.02-123.el8_6.12.aarch64.rpm
grub2-tools-debuginfo-2.02-123.el8_6.12.aarch64.rpm
grub2-tools-extra-2.02-123.el8_6.12.aarch64.rpm
grub2-tools-extra-debuginfo-2.02-123.el8_6.12.aarch64.rpm
grub2-tools-minimal-2.02-123.el8_6.12.aarch64.rpm
grub2-tools-minimal-debuginfo-2.02-123.el8_6.12.aarch64.rpm

noarch:
grub2-common-2.02-123.el8_6.12.noarch.rpm
grub2-efi-aa64-modules-2.02-123.el8_6.12.noarch.rpm
grub2-efi-ia32-modules-2.02-123.el8_6.12.noarch.rpm
grub2-efi-x64-modules-2.02-123.el8_6.12.noarch.rpm
grub2-pc-modules-2.02-123.el8_6.12.noarch.rpm
grub2-ppc64le-modules-2.02-123.el8_6.12.noarch.rpm

ppc64le:
grub2-debuginfo-2.02-123.el8_6.12.ppc64le.rpm
grub2-debugsource-2.02-123.el8_6.12.ppc64le.rpm
grub2-ppc64le-2.02-123.el8_6.12.ppc64le.rpm
grub2-tools-2.02-123.el8_6.12.ppc64le.rpm
grub2-tools-debuginfo-2.02-123.el8_6.12.ppc64le.rpm
grub2-tools-extra-2.02-123.el8_6.12.ppc64le.rpm
grub2-tools-extra-debuginfo-2.02-123.el8_6.12.ppc64le.rpm
grub2-tools-minimal-2.02-123.el8_6.12.ppc64le.rpm
grub2-tools-minimal-debuginfo-2.02-123.el8_6.12.ppc64le.rpm

x86_64:
grub2-debuginfo-2.02-123.el8_6.12.x86_64.rpm
grub2-debugsource-2.02-123.el8_6.12.x86_64.rpm
grub2-efi-ia32-2.02-123.el8_6.12.x86_64.rpm
grub2-efi-ia32-cdboot-2.02-123.el8_6.12.x86_64.rpm
grub2-efi-x64-2.02-123.el8_6.12.x86_64.rpm
grub2-efi-x64-cdboot-2.02-123.el8_6.12.x86_64.rpm
grub2-pc-2.02-123.el8_6.12.x86_64.rpm
grub2-tools-2.02-123.el8_6.12.x86_64.rpm
grub2-tools-debuginfo-2.02-123.el8_6.12.x86_64.rpm
grub2-tools-efi-2.02-123.el8_6.12.x86_64.rpm
grub2-tools-efi-debuginfo-2.02-123.el8_6.12.x86_64.rpm
grub2-tools-extra-2.02-123.el8_6.12.x86_64.rpm
grub2-tools-extra-debuginfo-2.02-123.el8_6.12.x86_64.rpm
grub2-tools-minimal-2.02-123.el8_6.12.x86_64.rpm
grub2-tools-minimal-debuginfo-2.02-123.el8_6.12.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-2022-2601
https://access.redhat.com/security/cve/CVE-2022-3775
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

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

Copyright 2023 Red Hat, Inc.
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