Issued:

2022-06-16

Updated:

2022-06-16

RHSA-2022:5099 - Important: grub2, mokutil, shim, and shim-unsigned-x64 security update

Synopsis

Important: grub2, mokutil, shim, and shim-unsigned-x64 security update

Type/Severity

Security Advisory Important

Topic

An update for grub2, mokutil, shim, and shim-unsigned-x64 is now available for Red Hat Enterprise Linux 9.

Red Hat Product Security has rated this update as having a security impact of Important. 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.

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.

The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot loader under secure boot environments.

Security Fix(es):

• grub2: Integer underflow in grub_net_recv_ip4_packets (CVE-2022-28733)

• grub2: Crafted PNG grayscale images may lead to out-of-bounds write in heap (CVE-2021-3695)

• grub2: Crafted PNG image may lead to out-of-bound write during huffman table handling (CVE-2021-3696)

• grub2: Crafted JPEG image can lead to buffer underflow write in the heap (CVE-2021-3697)

• grub2: Out-of-bound write when handling split HTTP headers (CVE-2022-28734)

• grub2: shim_lock verifier allows non-kernel files to be loaded (CVE-2022-28735)

• grub2: use-after-free in grub_cmd_chainloader() (CVE-2022-28736)

• shim: Buffer overflow when loading crafted EFI images (CVE-2022-28737)

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.

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

Affected Products

Updated Packages

• grub2-tools-efi-2.06-27.el9_0.7.x86_64.rpm
• mokutil-debuginfo-0.4.0-8.el9_0.1.aarch64.rpm
• grub2-tools-2.06-27.el9_0.7.x86_64.rpm
• mokutil-debugsource-0.4.0-8.el9_0.1.aarch64.rpm
• grub2-tools-2.06-27.el9_0.7.aarch64.rpm
• grub2-debuginfo-2.06-27.el9_0.7.x86_64.rpm
• grub2-debugsource-2.06-27.el9_0.7.x86_64.rpm
• grub2-tools-minimal-debuginfo-2.06-27.el9_0.7.x86_64.rpm
• grub2-ppc64le-2.06-27.el9_0.7.ppc64le.rpm
• shim-aa64-15.6-1.el9.aarch64.rpm
• grub2-ppc64le-modules-2.06-27.el9_0.7.noarch.rpm
• grub2-emu-debuginfo-2.06-27.el9_0.7.aarch64.rpm
• grub2-efi-aa64-2.06-27.el9_0.7.aarch64.rpm
• grub2-pc-2.06-27.el9_0.7.x86_64.rpm
• grub2-tools-2.06-27.el9_0.7.ppc64le.rpm
• grub2-emu-debuginfo-2.06-27.el9_0.7.x86_64.rpm
• grub2-tools-extra-debuginfo-2.06-27.el9_0.7.x86_64.rpm
• grub2-efi-aa64-cdboot-2.06-27.el9_0.7.aarch64.rpm
• grub2-tools-debuginfo-2.06-27.el9_0.7.ppc64le.rpm
• grub2-tools-extra-2.06-27.el9_0.7.ppc64le.rpm
• grub2-tools-minimal-2.06-27.el9_0.7.ppc64le.rpm
• grub2-efi-aa64-modules-2.06-27.el9_0.7.noarch.rpm
• grub2-efi-x64-cdboot-2.06-27.el9_0.7.x86_64.rpm
• grub2-debugsource-2.06-27.el9_0.7.ppc64le.rpm
• grub2-debugsource-2.06-27.el9_0.7.aarch64.rpm
• grub2-tools-extra-2.06-27.el9_0.7.x86_64.rpm
• grub2-tools-debuginfo-2.06-27.el9_0.7.x86_64.rpm
• grub2-common-2.06-27.el9_0.7.noarch.rpm
• grub2-tools-extra-debuginfo-2.06-27.el9_0.7.ppc64le.rpm
• grub2-tools-minimal-2.06-27.el9_0.7.aarch64.rpm
• grub2-2.06-27.el9_0.7.src.rpm
• grub2-tools-minimal-2.06-27.el9_0.7.x86_64.rpm
• grub2-tools-minimal-debuginfo-2.06-27.el9_0.7.aarch64.rpm
• grub2-tools-minimal-debuginfo-2.06-27.el9_0.7.ppc64le.rpm
• mokutil-0.4.0-8.el9_0.1.src.rpm
• grub2-efi-x64-modules-2.06-27.el9_0.7.noarch.rpm
• grub2-efi-x64-2.06-27.el9_0.7.x86_64.rpm
• grub2-debuginfo-2.06-27.el9_0.7.ppc64le.rpm
• grub2-tools-extra-2.06-27.el9_0.7.aarch64.rpm
• grub2-tools-extra-debuginfo-2.06-27.el9_0.7.aarch64.rpm
• mokutil-0.4.0-8.el9_0.1.aarch64.rpm
• mokutil-0.4.0-8.el9_0.1.x86_64.rpm
• mokutil-debuginfo-0.4.0-8.el9_0.1.x86_64.rpm
• shim-15.6-1.el9.src.rpm
• shim-unsigned-x64-15.6-1.el9.src.rpm
• shim-unsigned-x64-15.6-1.el9.x86_64.rpm
• shim-x64-15.6-1.el9.x86_64.rpm
• grub2-debuginfo-2.06-27.el9_0.7.aarch64.rpm
• grub2-tools-debuginfo-2.06-27.el9_0.7.aarch64.rpm
• grub2-tools-efi-debuginfo-2.06-27.el9_0.7.x86_64.rpm
• grub2-pc-modules-2.06-27.el9_0.7.noarch.rpm
• mokutil-debugsource-0.4.0-8.el9_0.1.x86_64.rpm

Fixes

• This content is not included.BZ - 1991685
• This content is not included.BZ - 1991686
• This content is not included.BZ - 1991687
• This content is not included.BZ - 2083339
• This content is not included.BZ - 2090463
• This content is not included.BZ - 2090857
• This content is not included.BZ - 2090899
• This content is not included.BZ - 2092613

CVEs

• CVE-2021-3695
• CVE-2021-3696
• CVE-2021-3697
• CVE-2022-28733
• CVE-2022-28734
• CVE-2022-28735
• CVE-2022-28736
• CVE-2022-28737

References

• https://access.redhat.com/security/updates/classification/#important

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.