RedHat: RHSA-2020-3271:01 Moderate: grub2 security and bug fix update
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.
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#1861857)
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-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
Package List
Red Hat Enterprise Linux ComputeNode EUS (v. 7.6):
Source:
fwupdate-12-6.el7_6.src.rpm
grub2-2.02-0.86.el7_6.src.rpm
shim-15-8.el7.src.rpm
shim-signed-15-8.el7_6.src.rpm
noarch:
grub2-common-2.02-0.86.el7_6.noarch.rpm
grub2-efi-ia32-modules-2.02-0.86.el7_6.noarch.rpm
grub2-efi-x64-modules-2.02-0.86.el7_6.noarch.rpm
grub2-pc-modules-2.02-0.86.el7_6.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_6.x86_64.rpm
fwupdate-debuginfo-12-6.el7_6.x86_64.rpm
fwupdate-efi-12-6.el7_6.x86_64.rpm
fwupdate-libs-12-6.el7_6.x86_64.rpm
grub2-2.02-0.86.el7_6.x86_64.rpm
grub2-debuginfo-2.02-0.86.el7_6.x86_64.rpm
grub2-efi-ia32-2.02-0.86.el7_6.x86_64.rpm
grub2-efi-x64-2.02-0.86.el7_6.x86_64.rpm
grub2-pc-2.02-0.86.el7_6.x86_64.rpm
grub2-tools-2.02-0.86.el7_6.x86_64.rpm
grub2-tools-extra-2.02-0.86.el7_6.x86_64.rpm
grub2-tools-minimal-2.02-0.86.el7_6.x86_64.rpm
mokutil-15-8.el7_6.x86_64.rpm
mokutil-debuginfo-15-8.el7_6.x86_64.rpm
shim-ia32-15-8.el7_6.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_6.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6):
noarch:
grub2-efi-aa64-modules-2.02-0.86.el7_6.noarch.rpm
grub2-ppc-modules-2.02-0.86.el7_6.noarch.rpm
grub2-ppc64-modules-2.02-0.86.el7_6.noarch.rpm
grub2-ppc64le-modules-2.02-0.86.el7_6.noarch.rpm
x86_64:
fwupdate-debuginfo-12-6.el7_6.x86_64.rpm
fwupdate-devel-12-6.el7_6.x86_64.rpm
grub2-debuginfo-2.02-0.86.el7_6.x86_64.rpm
grub2-efi-ia32-cdboot-2.02-0.86.el7_6.x86_64.rpm
grub2-efi-x64-cdboot-2.02-0.86.el7_6.x86_64.rpm
Red Hat Enterprise Linux Server EUS (v. 7.6):
Source:
fwupdate-12-6.el7_6.src.rpm
grub2-2.02-0.86.el7_6.src.rpm
shim-15-8.el7.src.rpm
shim-signed-15-8.el7_6.src.rpm
noarch:
grub2-common-2.02-0.86.el7_6.noarch.rpm
grub2-efi-ia32-modules-2.02-0.86.el7_6.noarch.rpm
grub2-efi-x64-modules-2.02-0.86.el7_6.noarch.rpm
grub2-pc-modules-2.02-0.86.el7_6.noarch.rpm
grub2-ppc64-modules-2.02-0.86.el7_6.noarch.rpm
grub2-ppc64le-modules-2.02-0.86.el7_6.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_6.ppc64.rpm
grub2-debuginfo-2.02-0.86.el7_6.ppc64.rpm
grub2-ppc64-2.02-0.86.el7_6.ppc64.rpm
grub2-tools-2.02-0.86.el7_6.ppc64.rpm
grub2-tools-extra-2.02-0.86.el7_6.ppc64.rpm
grub2-tools-minimal-2.02-0.86.el7_6.ppc64.rpm
ppc64le:
grub2-2.02-0.86.el7_6.ppc64le.rpm
grub2-debuginfo-2.02-0.86.el7_6.ppc64le.rpm
grub2-ppc64le-2.02-0.86.el7_6.ppc64le.rpm
grub2-tools-2.02-0.86.el7_6.ppc64le.rpm
grub2-tools-extra-2.02-0.86.el7_6.ppc64le.rpm
grub2-tools-minimal-2.02-0.86.el7_6.ppc64le.rpm
x86_64:
fwupdate-12-6.el7_6.x86_64.rpm
fwupdate-debuginfo-12-6.el7_6.x86_64.rpm
fwupdate-efi-12-6.el7_6.x86_64.rpm
fwupdate-libs-12-6.el7_6.x86_64.rpm
grub2-2.02-0.86.el7_6.x86_64.rpm
grub2-debuginfo-2.02-0.86.el7_6.x86_64.rpm
grub2-efi-ia32-2.02-0.86.el7_6.x86_64.rpm
grub2-efi-x64-2.02-0.86.el7_6.x86_64.rpm
grub2-pc-2.02-0.86.el7_6.x86_64.rpm
grub2-tools-2.02-0.86.el7_6.x86_64.rpm
grub2-tools-extra-2.02-0.86.el7_6.x86_64.rpm
grub2-tools-minimal-2.02-0.86.el7_6.x86_64.rpm
mokutil-15-8.el7_6.x86_64.rpm
mokutil-debuginfo-15-8.el7_6.x86_64.rpm
shim-ia32-15-8.el7_6.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_6.x86_64.rpm
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7):
Source:
fwupdate-12-6.el7_6.src.rpm
grub2-2.02-0.86.el7_6.src.rpm
shim-15-8.el7.src.rpm
shim-signed-15-8.el7_6.src.rpm
aarch64:
fwupdate-12-6.el7_6.aarch64.rpm
fwupdate-debuginfo-12-6.el7_6.aarch64.rpm
fwupdate-efi-12-6.el7_6.aarch64.rpm
fwupdate-libs-12-6.el7_6.aarch64.rpm
grub2-2.02-0.86.el7_6.aarch64.rpm
grub2-debuginfo-2.02-0.86.el7_6.aarch64.rpm
grub2-efi-aa64-2.02-0.86.el7_6.aarch64.rpm
grub2-tools-2.02-0.86.el7_6.aarch64.rpm
grub2-tools-extra-2.02-0.86.el7_6.aarch64.rpm
grub2-tools-minimal-2.02-0.86.el7_6.aarch64.rpm
mokutil-15-8.el7_6.aarch64.rpm
mokutil-debuginfo-15-8.el7_6.aarch64.rpm
shim-aa64-15-8.el7_6.aarch64.rpm
shim-unsigned-aa64-15-8.el7.aarch64.rpm
noarch:
grub2-common-2.02-0.86.el7_6.noarch.rpm
grub2-efi-aa64-modules-2.02-0.86.el7_6.noarch.rpm
grub2-ppc64le-modules-2.02-0.86.el7_6.noarch.rpm
shim-unsigned-ia32-debuginfo-15-8.el7.noarch.rpm
shim-unsigned-x64-debuginfo-15-8.el7.noarch.rpm
ppc64le:
grub2-2.02-0.86.el7_6.ppc64le.rpm
grub2-debuginfo-2.02-0.86.el7_6.ppc64le.rpm
grub2-ppc64le-2.02-0.86.el7_6.ppc64le.rpm
grub2-tools-2.02-0.86.el7_6.ppc64le.rpm
grub2-tools-extra-2.02-0.86.el7_6.ppc64le.rpm
grub2-tools-minimal-2.02-0.86.el7_6.ppc64le.rpm
Red Hat Enterprise Linux Server Optional EUS (v. 7.6):
noarch:
grub2-efi-aa64-modules-2.02-0.86.el7_6.noarch.rpm
grub2-efi-ia32-modules-2.02-0.86.el7_6.noarch.rpm
grub2-efi-x64-modules-2.02-0.86.el7_6.noarch.rpm
grub2-pc-modules-2.02-0.86.el7_6.noarch.rpm
grub2-ppc-modules-2.02-0.86.el7_6.noarch.rpm
grub2-ppc64-modules-2.02-0.86.el7_6.noarch.rpm
grub2-ppc64le-modules-2.02-0.86.el7_6.noarch.rpm
x86_64:
fwupdate-debuginfo-12-6.el7_6.x86_64.rpm
fwupdate-devel-12-6.el7_6.x86_64.rpm
grub2-debuginfo-2.02-0.86.el7_6.x86_64.rpm
grub2-efi-ia32-cdboot-2.02-0.86.el7_6.x86_64.rpm
grub2-efi-x64-cdboot-2.02-0.86.el7_6.x86_64.rpm
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7):
aarch64:
fwupdate-debuginfo-12-6.el7_6.aarch64.rpm
fwupdate-devel-12-6.el7_6.aarch64.rpm
grub2-debuginfo-2.02-0.86.el7_6.aarch64.rpm
grub2-efi-aa64-cdboot-2.02-0.86.el7_6.aarch64.rpm
noarch:
grub2-efi-aa64-modules-2.02-0.86.el7_6.noarch.rpm
grub2-efi-ia32-modules-2.02-0.86.el7_6.noarch.rpm
grub2-efi-x64-modules-2.02-0.86.el7_6.noarch.rpm
grub2-pc-modules-2.02-0.86.el7_6.noarch.rpm
grub2-ppc-modules-2.02-0.86.el7_6.noarch.rpm
grub2-ppc64-modules-2.02-0.86.el7_6.noarch.rpm
grub2-ppc64le-modules-2.02-0.86.el7_6.noarch.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, shim, shim-signed, and fwupdate is now available forRed Hat Enterprise Linux 7.6 Extended Update Support.Red Hat Product Security has rated this update as having a security impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.
Topic
Relevant Releases Architectures
Red Hat Enterprise Linux ComputeNode EUS (v. 7.6) - noarch, x86_64
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6) - noarch, x86_64
Red Hat Enterprise Linux Server EUS (v. 7.6) - noarch, ppc64, ppc64le, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 7.6) - noarch, x86_64
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) - aarch64, noarch, ppc64le
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) - aarch64, noarch
Bugs Fixed
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
1861857 - grub2 should get resynced with 7.8 branch