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RedHat: RHSA-2020-3223-01 Moderate: Grub2 Code Execution Risk

red hat
Calendar Grey July 29, 2020
Dist Redhat Esm H88
A substantial grub2 security enhancement for Red Hat Enterprise Linux addresses vulnerabilities that could lead to unauthorized code execution during system startup.
An update for grub2, shim, shim-unsigned-x64, and fwupd is now available for Red Hat Enterprise Linux 8.1 Extended Update Support

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 arbitrary code execution moderate severity 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 EUS (v. 8.1):
Source: fwupd-1.1.4-2.el8_1.src.rpm grub2-2.02-87.el8_1.src.rpm shim-15-14.el8_1.src.rpm
aarch64: fwupd-1.1.4-2.el8_1.aarch64.rpm fwupd-debuginfo-1.1.4-2.el8_1.aarch64.rpm fwupd-debugsource-1.1.4-2.el8_1.aarch64.rpm grub2-debuginfo-2.02-87.el8_1.aarch64.rpm grub2-debugsource-2.02-87.el8_1.aarch64.rpm grub2-efi-aa64-2.02-87.el8_1.aarch64.rpm grub2-efi-aa64-cdboot-2.02-87.el8_1.aarch64.rpm grub2-tools-2.02-87.el8_1.aarch64.rpm grub2-tools-debuginfo-2.02-87.el8_1.aarch64.rpm grub2-tools-extra-2.02-87.el8_1.aarch64.rpm grub2-tools-extra-debuginfo-2.02-87.el8_1.aarch64.rpm grub2-tools-minimal-2.02-87.el8_1.aarch64.rpm grub2-tools-minimal-debuginfo-2.02-87.el8_1.aarch64.rpm shim-aa64-15-14.el8_1.aarch64.rpm
noarch: grub2-common-2.02-87.el8_1.noarch.rpm grub2-efi-aa64-modules-2.02-87.el8_1.noarch.rpm grub2-efi-ia32-modules-2.02-87.el8_1.noarch.rpm grub2-efi-x64-modules-2.02-87.el8_1.noarch.rpm grub2-pc-modules-2.02-87.el8_1.noarch.rpm grub2-ppc64le-modules-2.02-87.el8_1.noarch.rpm
ppc64le: fwupd-1.1.4-2.el8_1.ppc64le.rpm fwupd-debuginfo-1.1.4-2.el8_1.ppc64le.rpm fwupd-debugsource-1.1.4-2.el8_1.ppc64le.rpm grub2-debuginfo-2.02-87.el8_1.ppc64le.rpm grub2-debugsource-2.02-87.el8_1.ppc64le.rpm

Read the Full Advisory


Advisory ID: RHSA-2020:3223-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2020:3223
Issue date: 2020-07-29

Topic

An update for grub2, shim, shim-unsigned-x64, and fwupd is now availablefor Red Hat Enterprise Linux 8.1 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.

Topics%20covered

Topics Covered

security advisory arbitrary code execution moderate severity Red Hat Enterprise firmware update grub2 boot loader

Relevant Releases Architectures

Red Hat CodeReady Linux Builder EUS (v. 8.1) - x86_64

Red Hat Enterprise Linux BaseOS EUS (v. 8.1) - 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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