RedHat: RHSA-2022-5095:01 Important: grub2, mokutil, shim,
Summary
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.
Summary
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
References
https://access.redhat.com/security/cve/CVE-2021-3695 https://access.redhat.com/security/cve/CVE-2021-3696 https://access.redhat.com/security/cve/CVE-2021-3697 https://access.redhat.com/security/cve/CVE-2022-28733 https://access.redhat.com/security/cve/CVE-2022-28734 https://access.redhat.com/security/cve/CVE-2022-28735 https://access.redhat.com/security/cve/CVE-2022-28736 https://access.redhat.com/security/cve/CVE-2022-28737 https://access.redhat.com/security/updates/classification/#important
Package List
Red Hat Enterprise Linux BaseOS (v. 8):
Source:
grub2-2.02-123.el8_6.8.src.rpm
mokutil-0.3.0-11.el8_6.1.src.rpm
shim-15.6-1.el8.src.rpm
aarch64:
grub2-debuginfo-2.02-123.el8_6.8.aarch64.rpm
grub2-debugsource-2.02-123.el8_6.8.aarch64.rpm
grub2-efi-aa64-2.02-123.el8_6.8.aarch64.rpm
grub2-efi-aa64-cdboot-2.02-123.el8_6.8.aarch64.rpm
grub2-tools-2.02-123.el8_6.8.aarch64.rpm
grub2-tools-debuginfo-2.02-123.el8_6.8.aarch64.rpm
grub2-tools-extra-2.02-123.el8_6.8.aarch64.rpm
grub2-tools-extra-debuginfo-2.02-123.el8_6.8.aarch64.rpm
grub2-tools-minimal-2.02-123.el8_6.8.aarch64.rpm
grub2-tools-minimal-debuginfo-2.02-123.el8_6.8.aarch64.rpm
mokutil-0.3.0-11.el8_6.1.aarch64.rpm
mokutil-debuginfo-0.3.0-11.el8_6.1.aarch64.rpm
mokutil-debugsource-0.3.0-11.el8_6.1.aarch64.rpm
shim-aa64-15.6-1.el8.aarch64.rpm
noarch:
grub2-common-2.02-123.el8_6.8.noarch.rpm
grub2-efi-aa64-modules-2.02-123.el8_6.8.noarch.rpm
grub2-efi-ia32-modules-2.02-123.el8_6.8.noarch.rpm
grub2-efi-x64-modules-2.02-123.el8_6.8.noarch.rpm
grub2-pc-modules-2.02-123.el8_6.8.noarch.rpm
grub2-ppc64le-modules-2.02-123.el8_6.8.noarch.rpm
ppc64le:
grub2-debuginfo-2.02-123.el8_6.8.ppc64le.rpm
grub2-debugsource-2.02-123.el8_6.8.ppc64le.rpm
grub2-ppc64le-2.02-123.el8_6.8.ppc64le.rpm
grub2-tools-2.02-123.el8_6.8.ppc64le.rpm
grub2-tools-debuginfo-2.02-123.el8_6.8.ppc64le.rpm
grub2-tools-extra-2.02-123.el8_6.8.ppc64le.rpm
grub2-tools-extra-debuginfo-2.02-123.el8_6.8.ppc64le.rpm
grub2-tools-minimal-2.02-123.el8_6.8.ppc64le.rpm
grub2-tools-minimal-debuginfo-2.02-123.el8_6.8.ppc64le.rpm
x86_64:
grub2-debuginfo-2.02-123.el8_6.8.x86_64.rpm
grub2-debugsource-2.02-123.el8_6.8.x86_64.rpm
grub2-efi-ia32-2.02-123.el8_6.8.x86_64.rpm
grub2-efi-ia32-cdboot-2.02-123.el8_6.8.x86_64.rpm
grub2-efi-x64-2.02-123.el8_6.8.x86_64.rpm
grub2-efi-x64-cdboot-2.02-123.el8_6.8.x86_64.rpm
grub2-pc-2.02-123.el8_6.8.x86_64.rpm
grub2-tools-2.02-123.el8_6.8.x86_64.rpm
grub2-tools-debuginfo-2.02-123.el8_6.8.x86_64.rpm
grub2-tools-efi-2.02-123.el8_6.8.x86_64.rpm
grub2-tools-efi-debuginfo-2.02-123.el8_6.8.x86_64.rpm
grub2-tools-extra-2.02-123.el8_6.8.x86_64.rpm
grub2-tools-extra-debuginfo-2.02-123.el8_6.8.x86_64.rpm
grub2-tools-minimal-2.02-123.el8_6.8.x86_64.rpm
grub2-tools-minimal-debuginfo-2.02-123.el8_6.8.x86_64.rpm
mokutil-0.3.0-11.el8_6.1.x86_64.rpm
mokutil-debuginfo-0.3.0-11.el8_6.1.x86_64.rpm
mokutil-debugsource-0.3.0-11.el8_6.1.x86_64.rpm
shim-ia32-15.6-1.el8.x86_64.rpm
shim-x64-15.6-1.el8.x86_64.rpm
Red Hat CodeReady Linux Builder (v. 8):
Source:
shim-unsigned-x64-15.6-1.el8.src.rpm
x86_64:
shim-unsigned-x64-15.6-1.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/
Topic
An update for grub2, mokutil, shim, and shim-unsigned-x64 is now availablefor Red Hat Enterprise Linux 8.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.
Topic
Relevant Releases Architectures
Red Hat CodeReady Linux Builder (v. 8) - x86_64
Red Hat Enterprise Linux BaseOS (v. 8) - aarch64, noarch, ppc64le, x86_64
Bugs Fixed
1991685 - CVE-2021-3695 grub2: Crafted PNG grayscale images may lead to out-of-bounds write in heap
1991686 - CVE-2021-3696 grub2: Crafted PNG image may lead to out-of-bound write during huffman table handling
1991687 - CVE-2021-3697 grub2: Crafted JPEG image can lead to buffer underflow write in the heap
2083339 - CVE-2022-28733 grub2: Integer underflow in grub_net_recv_ip4_packets
2090463 - CVE-2022-28734 grub2: Out-of-bound write when handling split HTTP headers2090857 - CVE-2022-28735 grub2: shim_lock verifier allows non-kernel files to be loaded
2090899 - CVE-2022-28737 shim: Buffer overflow when loading crafted EFI images
2092613 - CVE-2022-28736 grub2: use-after-free in grub_cmd_chainloader()