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Red Hat Security Advisory
Synopsis: Moderate: grub2 security and bug fix update
Advisory ID: RHSA-2020:3274-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2020:3274
Issue date: 2020-08-03
CVE Names: CVE-2020-10713 CVE-2020-14308 CVE-2020-14309
CVE-2020-14310 CVE-2020-14311 CVE-2020-15705
CVE-2020-15706 CVE-2020-15707
=====================================================================
1. Summary:
An update for grub2, shim, shim-signed, and fwupdate is now available for
Red Hat Enterprise Linux 7.7 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 ComputeNode EUS (v. 7.7) - noarch, x86_64
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7) - noarch, x86_64
Red Hat Enterprise Linux Server EUS (v. 7.7) - noarch, ppc64, ppc64le, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 7.7) - noarch, 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.
The shim package contains a first-stage UEFI boot loader that handles
chaining to a trusted full boot loader under secure boot environments.
The fwupdate packages provide a service that allows session software to
update device firmware.
Security Fix(es):
* grub2: Crafted grub.cfg file can lead to arbitrary code execution during
boot process (CVE-2020-10713)
* grub2: grub_malloc does not validate allocation size allowing for
arithmetic overflow and subsequent heap-based buffer overflow
(CVE-2020-14308)
* grub2: Integer overflow in grub_squash_read_symlink may lead to
heap-based buffer overflow (CVE-2020-14309)
* grub2: Integer overflow read_section_as_string may lead to heap-based
buffer overflow (CVE-2020-14310)
* grub2: Integer overflow in grub_ext2_read_link leads to heap-based buffer
overflow (CVE-2020-14311)
* grub2: Fail kernel validation without shim protocol (CVE-2020-15705)
* grub2: Use-after-free redefining a function whilst the same function is
already executing (CVE-2020-15706)
* grub2: Integer overflow in initrd size handling (CVE-2020-15707)
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):
* grub2 should get resynced with 7.8 branch (BZ#1861855)
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/):
1825243 - CVE-2020-10713 grub2: Crafted grub.cfg file can lead to arbitrary
code execution during boot process
1852009 - CVE-2020-14308 grub2: grub_malloc does not validate allocation size
allowing for arithmetic overflow and subsequent heap-based buffer overflow
1852014 - CVE-2020-14311 grub2: Integer overflow in grub_ext2_read_link leads
to heap-based buffer overflow
1852022 - CVE-2020-14309 grub2: Integer overflow in grub_squash_read_symlink
may lead to heap-based buffer overflow
1852030 - CVE-2020-14310 grub2: Integer overflow read_section_as_string may
lead to heap-based buffer overflow
1860978 - CVE-2020-15705 grub2: Fail kernel validation without shim protocol
1861118 - CVE-2020-15706 grub2: Use-after-free redefining a function whilst the
same function is already executing
1861581 - CVE-2020-15707 grub2: Integer overflow in initrd size handling
1861855 - grub2 should get resynced with 7.8 branch
6. Package List:
Red Hat Enterprise Linux ComputeNode EUS (v. 7.7):
Source:
fwupdate-12-6.el7_7.src.rpm
grub2-2.02-0.86.el7_7.src.rpm
shim-15-8.el7.src.rpm
shim-signed-15-8.el7_7.src.rpm
noarch:
grub2-common-2.02-0.86.el7_7.noarch.rpm
grub2-efi-ia32-modules-2.02-0.86.el7_7.noarch.rpm
grub2-efi-x64-modules-2.02-0.86.el7_7.noarch.rpm
grub2-pc-modules-2.02-0.86.el7_7.noarch.rpm
shim-unsigned-aa64-debuginfo-15-8.el7.noarch.rpm
shim-unsigned-ia32-debuginfo-15-8.el7.noarch.rpm
shim-unsigned-x64-debuginfo-15-8.el7.noarch.rpm
x86_64:
fwupdate-12-6.el7_7.x86_64.rpm
fwupdate-debuginfo-12-6.el7_7.x86_64.rpm
fwupdate-efi-12-6.el7_7.x86_64.rpm
fwupdate-libs-12-6.el7_7.x86_64.rpm
grub2-2.02-0.86.el7_7.x86_64.rpm
grub2-debuginfo-2.02-0.86.el7_7.x86_64.rpm
grub2-efi-ia32-2.02-0.86.el7_7.x86_64.rpm
grub2-efi-x64-2.02-0.86.el7_7.x86_64.rpm
grub2-pc-2.02-0.86.el7_7.x86_64.rpm
grub2-tools-2.02-0.86.el7_7.x86_64.rpm
grub2-tools-extra-2.02-0.86.el7_7.x86_64.rpm
grub2-tools-minimal-2.02-0.86.el7_7.x86_64.rpm
mokutil-15-8.el7_7.x86_64.rpm
mokutil-debuginfo-15-8.el7_7.x86_64.rpm
shim-ia32-15-8.el7_7.x86_64.rpm
shim-unsigned-ia32-15-8.el7.x86_64.rpm
shim-unsigned-x64-15-8.el7.x86_64.rpm
shim-x64-15-8.el7_7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7):
noarch:
grub2-efi-aa64-modules-2.02-0.86.el7_7.noarch.rpm
grub2-ppc-modules-2.02-0.86.el7_7.noarch.rpm
grub2-ppc64-modules-2.02-0.86.el7_7.noarch.rpm
grub2-ppc64le-modules-2.02-0.86.el7_7.noarch.rpm
x86_64:
fwupdate-debuginfo-12-6.el7_7.x86_64.rpm
fwupdate-devel-12-6.el7_7.x86_64.rpm
grub2-debuginfo-2.02-0.86.el7_7.x86_64.rpm
grub2-efi-ia32-cdboot-2.02-0.86.el7_7.x86_64.rpm
grub2-efi-x64-cdboot-2.02-0.86.el7_7.x86_64.rpm
Red Hat Enterprise Linux Server EUS (v. 7.7):
Source:
fwupdate-12-6.el7_7.src.rpm
grub2-2.02-0.86.el7_7.src.rpm
shim-15-8.el7.src.rpm
shim-signed-15-8.el7_7.src.rpm
noarch:
grub2-common-2.02-0.86.el7_7.noarch.rpm
grub2-efi-ia32-modules-2.02-0.86.el7_7.noarch.rpm
grub2-efi-x64-modules-2.02-0.86.el7_7.noarch.rpm
grub2-pc-modules-2.02-0.86.el7_7.noarch.rpm
grub2-ppc64-modules-2.02-0.86.el7_7.noarch.rpm
grub2-ppc64le-modules-2.02-0.86.el7_7.noarch.rpm
shim-unsigned-aa64-debuginfo-15-8.el7.noarch.rpm
shim-unsigned-ia32-debuginfo-15-8.el7.noarch.rpm
shim-unsigned-x64-debuginfo-15-8.el7.noarch.rpm
ppc64:
grub2-2.02-0.86.el7_7.ppc64.rpm
grub2-debuginfo-2.02-0.86.el7_7.ppc64.rpm
grub2-ppc64-2.02-0.86.el7_7.ppc64.rpm
grub2-tools-2.02-0.86.el7_7.ppc64.rpm
grub2-tools-extra-2.02-0.86.el7_7.ppc64.rpm
grub2-tools-minimal-2.02-0.86.el7_7.ppc64.rpm
ppc64le:
grub2-2.02-0.86.el7_7.ppc64le.rpm
grub2-debuginfo-2.02-0.86.el7_7.ppc64le.rpm
grub2-ppc64le-2.02-0.86.el7_7.ppc64le.rpm
grub2-tools-2.02-0.86.el7_7.ppc64le.rpm
grub2-tools-extra-2.02-0.86.el7_7.ppc64le.rpm
grub2-tools-minimal-2.02-0.86.el7_7.ppc64le.rpm
x86_64:
fwupdate-12-6.el7_7.x86_64.rpm
fwupdate-debuginfo-12-6.el7_7.x86_64.rpm
fwupdate-efi-12-6.el7_7.x86_64.rpm
fwupdate-libs-12-6.el7_7.x86_64.rpm
grub2-2.02-0.86.el7_7.x86_64.rpm
grub2-debuginfo-2.02-0.86.el7_7.x86_64.rpm
grub2-efi-ia32-2.02-0.86.el7_7.x86_64.rpm
grub2-efi-x64-2.02-0.86.el7_7.x86_64.rpm
grub2-pc-2.02-0.86.el7_7.x86_64.rpm
grub2-tools-2.02-0.86.el7_7.x86_64.rpm
grub2-tools-extra-2.02-0.86.el7_7.x86_64.rpm
grub2-tools-minimal-2.02-0.86.el7_7.x86_64.rpm
mokutil-15-8.el7_7.x86_64.rpm
mokutil-debuginfo-15-8.el7_7.x86_64.rpm
shim-ia32-15-8.el7_7.x86_64.rpm
shim-unsigned-ia32-15-8.el7.x86_64.rpm
shim-unsigned-x64-15-8.el7.x86_64.rpm
shim-x64-15-8.el7_7.x86_64.rpm
Red Hat Enterprise Linux Server Optional EUS (v. 7.7):
noarch:
grub2-efi-aa64-modules-2.02-0.86.el7_7.noarch.rpm
grub2-efi-ia32-modules-2.02-0.86.el7_7.noarch.rpm
grub2-efi-x64-modules-2.02-0.86.el7_7.noarch.rpm
grub2-pc-modules-2.02-0.86.el7_7.noarch.rpm
grub2-ppc-modules-2.02-0.86.el7_7.noarch.rpm
grub2-ppc64-modules-2.02-0.86.el7_7.noarch.rpm
grub2-ppc64le-modules-2.02-0.86.el7_7.noarch.rpm
x86_64:
fwupdate-debuginfo-12-6.el7_7.x86_64.rpm
fwupdate-devel-12-6.el7_7.x86_64.rpm
grub2-debuginfo-2.02-0.86.el7_7.x86_64.rpm
grub2-efi-ia32-cdboot-2.02-0.86.el7_7.x86_64.rpm
grub2-efi-x64-cdboot-2.02-0.86.el7_7.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-2020-10713
https://access.redhat.com/security/cve/CVE-2020-14308
https://access.redhat.com/security/cve/CVE-2020-14309
https://access.redhat.com/security/cve/CVE-2020-14310
https://access.redhat.com/security/cve/CVE-2020-14311
https://access.redhat.com/security/cve/CVE-2020-15705
https://access.redhat.com/security/cve/CVE-2020-15706
https://access.redhat.com/security/cve/CVE-2020-15707
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/security/vulnerabilities/grub2bootloader
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2020 Red Hat, Inc.
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