Issued:
2020-08-03
Updated:
2020-08-03

RHSA-2020:3271 - Moderate: grub2 security and bug fix update

Synopsis

Moderate: grub2 security and bug fix update

Type/Severity

Security Advisory Moderate

Topic

An update for grub2, shim, shim-signed, and fwupdate is now available for Red Hat Enterprise Linux 7.6 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.

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#1861857)

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

ProductVersionArch
Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions7.6x86_64
Red Hat Enterprise Linux for x86_64 - Extended Update Support7.6x86_64
Red Hat Enterprise Linux for Power, little endian - Extended Update Support7.6ppc64le
Red Hat Enterprise Linux for Power, big endian - Extended Update Support7.6ppc64
Red Hat Enterprise Linux for Power 97ppc64le
Red Hat Enterprise Linux for ARM 647aarch64
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions7.6ppc64le
Red Hat Enterprise Linux Server - TUS7.6x86_64
Red Hat Enterprise Linux Server - AUS7.6x86_64
Red Hat Enterprise Linux EUS Compute Node7.6x86_64

Updated Packages

  • grub2-ppc64-modules-2.02-0.86.el7_6.noarch.rpm
  • fwupdate-efi-12-6.el7_6.x86_64.rpm
  • grub2-debuginfo-2.02-0.86.el7_6.x86_64.rpm
  • shim-x64-15-8.el7_6.x86_64.rpm
  • grub2-ppc64-2.02-0.86.el7_6.ppc64.rpm
  • grub2-tools-extra-2.02-0.86.el7_6.ppc64.rpm
  • shim-unsigned-aa64-debuginfo-15-8.el7.noarch.rpm
  • grub2-2.02-0.86.el7_6.aarch64.rpm
  • shim-signed-15-8.el7_6.src.rpm
  • fwupdate-efi-12-6.el7_6.aarch64.rpm
  • grub2-efi-ia32-modules-2.02-0.86.el7_6.noarch.rpm
  • shim-unsigned-aa64-15-8.el7.aarch64.rpm
  • grub2-tools-minimal-2.02-0.86.el7_6.ppc64le.rpm
  • grub2-tools-minimal-2.02-0.86.el7_6.ppc64.rpm
  • mokutil-15-8.el7_6.aarch64.rpm
  • mokutil-15-8.el7_6.x86_64.rpm
  • grub2-debuginfo-2.02-0.86.el7_6.ppc64.rpm
  • shim-ia32-15-8.el7_6.x86_64.rpm
  • grub2-efi-x64-cdboot-2.02-0.86.el7_6.x86_64.rpm
  • grub2-common-2.02-0.86.el7_6.noarch.rpm
  • fwupdate-12-6.el7_6.x86_64.rpm
  • fwupdate-12-6.el7_6.src.rpm
  • fwupdate-12-6.el7_6.aarch64.rpm
  • grub2-tools-minimal-2.02-0.86.el7_6.x86_64.rpm
  • grub2-ppc-modules-2.02-0.86.el7_6.noarch.rpm
  • grub2-tools-minimal-2.02-0.86.el7_6.aarch64.rpm
  • grub2-efi-x64-2.02-0.86.el7_6.x86_64.rpm
  • grub2-efi-aa64-cdboot-2.02-0.86.el7_6.aarch64.rpm
  • grub2-ppc64le-modules-2.02-0.86.el7_6.noarch.rpm
  • grub2-ppc64le-2.02-0.86.el7_6.ppc64le.rpm
  • grub2-tools-2.02-0.86.el7_6.ppc64le.rpm
  • grub2-efi-aa64-2.02-0.86.el7_6.aarch64.rpm
  • grub2-pc-modules-2.02-0.86.el7_6.noarch.rpm
  • mokutil-debuginfo-15-8.el7_6.x86_64.rpm
  • grub2-tools-extra-2.02-0.86.el7_6.x86_64.rpm
  • grub2-debuginfo-2.02-0.86.el7_6.aarch64.rpm
  • grub2-debuginfo-2.02-0.86.el7_6.ppc64le.rpm
  • grub2-efi-x64-modules-2.02-0.86.el7_6.noarch.rpm
  • shim-unsigned-x64-15-8.el7.x86_64.rpm
  • grub2-tools-2.02-0.86.el7_6.x86_64.rpm
  • shim-unsigned-ia32-15-8.el7.x86_64.rpm
  • grub2-efi-ia32-2.02-0.86.el7_6.x86_64.rpm
  • shim-15-8.el7.src.rpm
  • fwupdate-devel-12-6.el7_6.aarch64.rpm
  • grub2-pc-2.02-0.86.el7_6.x86_64.rpm
  • shim-aa64-15-8.el7_6.aarch64.rpm
  • grub2-tools-extra-2.02-0.86.el7_6.ppc64le.rpm
  • grub2-tools-extra-2.02-0.86.el7_6.aarch64.rpm
  • grub2-2.02-0.86.el7_6.ppc64.rpm
  • grub2-2.02-0.86.el7_6.src.rpm
  • grub2-efi-aa64-modules-2.02-0.86.el7_6.noarch.rpm
  • grub2-2.02-0.86.el7_6.ppc64le.rpm
  • fwupdate-libs-12-6.el7_6.aarch64.rpm
  • fwupdate-devel-12-6.el7_6.x86_64.rpm
  • grub2-efi-ia32-cdboot-2.02-0.86.el7_6.x86_64.rpm
  • grub2-2.02-0.86.el7_6.x86_64.rpm
  • grub2-tools-2.02-0.86.el7_6.aarch64.rpm
  • fwupdate-libs-12-6.el7_6.x86_64.rpm
  • grub2-tools-2.02-0.86.el7_6.ppc64.rpm
  • mokutil-debuginfo-15-8.el7_6.aarch64.rpm
  • fwupdate-debuginfo-12-6.el7_6.x86_64.rpm
  • fwupdate-debuginfo-12-6.el7_6.aarch64.rpm

Fixes

CVEs

References

Additional information