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Red Hat: RHSA-2021-0696-01 Moderate: Grub2 Security Issues

red hat
Calendar Grey March 2, 2021
Scroller Redhat
Debian issued a significant security patch for systemd resolving various vulnerabilities. Keep updated on changes and potential effects.
An update for grub2 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.
Security Fix(es):
* grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled (CVE-2020-14372)
* grub2: Use-after-free in rmmod command (CVE-2020-25632)
* grub2: Out-of-bounds write in grub_usb_device_initialize() (CVE-2020-25647)
* grub2: Stack buffer overflow in grub_parser_split_cmdline() (CVE-2020-27749)
* grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled (CVE-2020-27779)
* grub2: Heap out-of-bounds write in short form option parser (CVE-2021-20225)
* grub2: Heap out-of-bounds write due to miscalculation of space required for quoting (CVE-2021-20233)
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 update Red Hat update access control Red Hat Enterprise Linux security impact moderate risk grub2 boot loader

References

https://access.redhat.com/security/cve/CVE-2020-14372 https://access.redhat.com/security/cve/CVE-2020-25632 https://access.redhat.com/security/cve/CVE-2020-25647 https://access.redhat.com/security/cve/CVE-2020-27749 https://access.redhat.com/security/cve/CVE-2020-27779 https://access.redhat.com/security/cve/CVE-2021-20225 https://access.redhat.com/security/cve/CVE-2021-20233 https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/security/vulnerabilities/RHSB-2021-003

Package List

Red Hat Enterprise Linux BaseOS (v. 8):
Source: grub2-2.02-90.el8_3.1.src.rpm
aarch64: grub2-debuginfo-2.02-90.el8_3.1.aarch64.rpm grub2-debugsource-2.02-90.el8_3.1.aarch64.rpm grub2-efi-aa64-2.02-90.el8_3.1.aarch64.rpm grub2-efi-aa64-cdboot-2.02-90.el8_3.1.aarch64.rpm grub2-tools-2.02-90.el8_3.1.aarch64.rpm grub2-tools-debuginfo-2.02-90.el8_3.1.aarch64.rpm grub2-tools-extra-2.02-90.el8_3.1.aarch64.rpm grub2-tools-extra-debuginfo-2.02-90.el8_3.1.aarch64.rpm grub2-tools-minimal-2.02-90.el8_3.1.aarch64.rpm grub2-tools-minimal-debuginfo-2.02-90.el8_3.1.aarch64.rpm
noarch: grub2-common-2.02-90.el8_3.1.noarch.rpm grub2-efi-aa64-modules-2.02-90.el8_3.1.noarch.rpm grub2-efi-ia32-modules-2.02-90.el8_3.1.noarch.rpm grub2-efi-x64-modules-2.02-90.el8_3.1.noarch.rpm grub2-pc-modules-2.02-90.el8_3.1.noarch.rpm grub2-ppc64le-modules-2.02-90.el8_3.1.noarch.rpm
ppc64le: grub2-debuginfo-2.02-90.el8_3.1.ppc64le.rpm grub2-debugsource-2.02-90.el8_3.1.ppc64le.rpm grub2-ppc64le-2.02-90.el8_3.1.ppc64le.rpm grub2-tools-2.02-90.el8_3.1.ppc64le.rpm grub2-tools-debuginfo-2.02-90.el8_3.1.ppc64le.rpm grub2-tools-extra-2.02-90.el8_3.1.ppc64le.rpm grub2-tools-extra-debuginfo-2.02-90.el8_3.1.ppc64le.rpm grub2-tools-minimal-2.02-90.el8_3.1.ppc64le.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:0696-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:0696
Issue date: 2021-03-02

Topic

An update for grub2 is now available for 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 update Red Hat update access control Red Hat Enterprise Linux security impact moderate risk grub2 boot loader

Relevant Releases Architectures

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

Bugs Fixed

1873150 - CVE-2020-14372 grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled

1879577 - CVE-2020-25632 grub2: Use-after-free in rmmod command

1886936 - CVE-2020-25647 grub2: Out-of-bounds write in grub_usb_device_initialize()

1899966 - CVE-2020-27749 grub2: Stack buffer overflow in grub_parser_split_cmdline()

1900698 - CVE-2020-27779 grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled

1924696 - CVE-2021-20225 grub2: Heap out-of-bounds write in short form option parser

1926263 - CVE-2021-20233 grub2: Heap out-of-bounds write due to miscalculation of space required for quoting

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