Alerts This Week
Warning Icon 1 764
Alerts This Week
Warning Icon 1 764

Red Hat Enterprise Linux 7: RHSA-2020-3217-01 Moderate: Grub2 Bug Fix

red hat
Calendar Grey July 29, 2020
Dist Redhat Esm H88
CentOS has released a notification concerning grub2, focusing on vulnerabilities that pose a moderate risk to Enterprise Linux 7.
An update for grub2, shim, shim-signed, and fwupdate is now available for Red Hat Enterprise Linux 7

Solution

Before applying this update, make sure all previously released errata relevant to your system have been applied.

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 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 doesn't handle relative paths correctly for UEFI HTTP Boot (BZ#1616395)
* UEFI HTTP boot over IPv6 does not work (BZ#1732765)
Users of grub2 are advised to upgrade to these updated packages, which fix these bugs.

Topics%20covered

Topics Covered

security advisory Red Hat bug fix arbitrary code execution moderate severity 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 Client (v. 7):
Source: fwupdate-12-6.el7_8.src.rpm grub2-2.02-0.86.el7_8.src.rpm shim-15-7.el7_9.src.rpm shim-signed-15-7.el7_8.src.rpm
noarch: grub2-common-2.02-0.86.el7_8.noarch.rpm grub2-efi-ia32-modules-2.02-0.86.el7_8.noarch.rpm grub2-efi-x64-modules-2.02-0.86.el7_8.noarch.rpm grub2-pc-modules-2.02-0.86.el7_8.noarch.rpm shim-unsigned-aa64-debuginfo-15-7.el7_9.noarch.rpm shim-unsigned-ia32-debuginfo-15-7.el7_9.noarch.rpm shim-unsigned-x64-debuginfo-15-7.el7_9.noarch.rpm
x86_64: fwupdate-12-6.el7_8.x86_64.rpm fwupdate-debuginfo-12-6.el7_8.x86_64.rpm fwupdate-efi-12-6.el7_8.x86_64.rpm fwupdate-libs-12-6.el7_8.x86_64.rpm grub2-2.02-0.86.el7_8.x86_64.rpm grub2-debuginfo-2.02-0.86.el7_8.x86_64.rpm grub2-efi-ia32-2.02-0.86.el7_8.x86_64.rpm grub2-efi-x64-2.02-0.86.el7_8.x86_64.rpm grub2-pc-2.02-0.86.el7_8.x86_64.rpm grub2-tools-2.02-0.86.el7_8.x86_64.rpm grub2-tools-extra-2.02-0.86.el7_8.x86_64.rpm grub2-tools-minimal-2.02-0.86.el7_8.x86_64.rpm mokutil-15-7.el7_8.x86_64.rpm mokutil-debuginfo-15-7.el7_8.x86_64.rpm shim-ia32-15-7.el7_8.x86_64.rpm shim-unsigned-ia32-15-7.el7_9.x86_64.rpm shim-unsigned-x64-15-7.el7_9.x86_64.rpm shim-x64-15-7.el7_8.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
noarch:

Read the Full Advisory


Advisory ID: RHSA-2020:3217-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2020:3217
Issue date: 2020-07-29

Topic

An update for grub2, shim, shim-signed, and fwupdate is now available forRed Hat Enterprise Linux 7.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 Red Hat bug fix arbitrary code execution moderate severity grub2 boot loader

Relevant Releases Architectures

Red Hat Enterprise Linux Client (v. 7) - noarch, x86_64

Red Hat Enterprise Linux Client Optional (v. 7) - noarch, x86_64

Red Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64

Red Hat Enterprise Linux ComputeNode Optional (v. 7) - noarch, x86_64

Red Hat Enterprise Linux Server (v. 7) - noarch, ppc64, ppc64le, x86_64

Red Hat Enterprise Linux Server Optional (v. 7) - noarch, x86_64

Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64

Red Hat Enterprise Linux Workstation Optional (v. 7) - noarch, x86_64

Bugs Fixed

1616395 - grub2 doesn't handle relative paths correctly for UEFI HTTP Boot

1732765 - UEFI HTTP boot over IPv6 does not work

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

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.

Your message here