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RedHat RHSA-2020:3216-01 Moderate: Grub2 Security Flaws

red hat
Calendar Grey July 29, 2020
Dist Redhat Esm H88
Canonical has released a significant security notice pertaining to snapd and its associated packages, outlining essential updates that are now accessible.
An update for grub2, shim, shim-unsigned-x64, and fwupd is now available for Red Hat Enterprise Linux 8

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

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 fwupd 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.

Topics%20covered

Topics Covered

security advisory moderate security issue red hat enterprise firmware update grub2 boot loader

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 BaseOS (v. 8):
Source: fwupd-1.1.4-7.el8_2.src.rpm grub2-2.02-87.el8_2.src.rpm shim-15-14.el8_2.src.rpm
aarch64: fwupd-1.1.4-7.el8_2.aarch64.rpm fwupd-debuginfo-1.1.4-7.el8_2.aarch64.rpm fwupd-debugsource-1.1.4-7.el8_2.aarch64.rpm grub2-debuginfo-2.02-87.el8_2.aarch64.rpm grub2-debugsource-2.02-87.el8_2.aarch64.rpm grub2-efi-aa64-2.02-87.el8_2.aarch64.rpm grub2-efi-aa64-cdboot-2.02-87.el8_2.aarch64.rpm grub2-tools-2.02-87.el8_2.aarch64.rpm grub2-tools-debuginfo-2.02-87.el8_2.aarch64.rpm grub2-tools-extra-2.02-87.el8_2.aarch64.rpm grub2-tools-extra-debuginfo-2.02-87.el8_2.aarch64.rpm grub2-tools-minimal-2.02-87.el8_2.aarch64.rpm grub2-tools-minimal-debuginfo-2.02-87.el8_2.aarch64.rpm shim-aa64-15-14.el8_2.aarch64.rpm
noarch: grub2-common-2.02-87.el8_2.noarch.rpm grub2-efi-aa64-modules-2.02-87.el8_2.noarch.rpm grub2-efi-ia32-modules-2.02-87.el8_2.noarch.rpm grub2-efi-x64-modules-2.02-87.el8_2.noarch.rpm grub2-pc-modules-2.02-87.el8_2.noarch.rpm grub2-ppc64le-modules-2.02-87.el8_2.noarch.rpm
ppc64le: fwupd-1.1.4-7.el8_2.ppc64le.rpm fwupd-debuginfo-1.1.4-7.el8_2.ppc64le.rpm fwupd-debugsource-1.1.4-7.el8_2.ppc64le.rpm grub2-debuginfo-2.02-87.el8_2.ppc64le.rpm grub2-debugsource-2.02-87.el8_2.ppc64le.rpm grub2-ppc64le-2.02-87.el8_2.ppc64le.rpm

Read the Full Advisory


Advisory ID: RHSA-2020:3216-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2020:3216
Issue date: 2020-07-29

Topic

An update for grub2, shim, shim-unsigned-x64, and fwupd is now availablefor Red Hat Enterprise Linux 8.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.

Topics%20covered

Topics Covered

security advisory moderate security issue red hat enterprise firmware update grub2 boot loader

Relevant Releases Architectures

Red Hat CodeReady Linux Builder (v. 8) - x86_64

Red Hat Enterprise Linux BaseOS (v. 8) - aarch64, noarch, ppc64le, s390x, x86_64

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

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