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Red Hat: RHSA-2020-3276-01 Moderate: Grub2 Security Update and Impact

red hat
Calendar Grey August 3, 2020
Dist Redhat Esm H88
Explore the recent important grub2 security patch for Red Hat Enterprise Linux, addressing significant components and unresolved issues.
An update for grub2, shim, and shim-signed is now available for Red Hat Enterprise Linux 7.3 Advanced Update Support, Red Hat Enterprise Linux 7.3 Telco Extended Update Support, an...

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.
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#1861860)

Topics%20covered

Topics Covered

security advisory Red Hat update buffer overflow code execution medium severity grub2

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 Server AUS (v. 7.3):
Source: grub2-2.02-0.86.el7.src.rpm shim-15-8.el7.src.rpm shim-signed-15-8.el7_3.src.rpm
noarch: grub2-common-2.02-0.86.el7.noarch.rpm grub2-efi-ia32-modules-2.02-0.86.el7.noarch.rpm grub2-efi-x64-modules-2.02-0.86.el7.noarch.rpm grub2-pc-modules-2.02-0.86.el7.noarch.rpm grub2-ppc-modules-2.02-0.86.el7.noarch.rpm grub2-ppc64-modules-2.02-0.86.el7.noarch.rpm grub2-ppc64le-modules-2.02-0.86.el7.noarch.rpm
x86_64: grub2-2.02-0.86.el7.x86_64.rpm grub2-debuginfo-2.02-0.86.el7.x86_64.rpm grub2-efi-ia32-2.02-0.86.el7.x86_64.rpm grub2-efi-x64-2.02-0.86.el7.x86_64.rpm grub2-pc-2.02-0.86.el7.x86_64.rpm grub2-tools-2.02-0.86.el7.x86_64.rpm grub2-tools-extra-2.02-0.86.el7.x86_64.rpm grub2-tools-minimal-2.02-0.86.el7.x86_64.rpm mokutil-15-8.el7_3.x86_64.rpm mokutil-debuginfo-15-8.el7_3.x86_64.rpm shim-15-8.el7_3.x86_64.rpm shim-unsigned-ia32-15-8.el7.x86_64.rpm shim-unsigned-x64-15-8.el7.x86_64.rpm
Red Hat Enterprise Linux Server E4S (v. 7.3):
Source: grub2-2.02-0.86.el7.src.rpm shim-15-8.el7.src.rpm shim-signed-15-8.el7_3.src.rpm
noarch: grub2-common-2.02-0.86.el7.noarch.rpm grub2-efi-aa64-modules-2.02-0.86.el7.noarch.rpm grub2-efi-ia32-modules-2.02-0.86.el7.noarch.rpm grub2-efi-x64-modules-2.02-0.86.el7.noarch.rpm

Read the Full Advisory


Advisory ID: RHSA-2020:3276-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2020:3276
Issue date: 2020-08-03

Topic

An update for grub2, shim, and shim-signed is now available for Red HatEnterprise Linux 7.3 Advanced Update Support, Red Hat Enterprise Linux 7.3Telco Extended Update Support, and Red Hat Enterprise Linux 7.3 UpdateServices for SAP Solutions.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 update buffer overflow code execution medium severity grub2

Relevant Releases Architectures

Red Hat Enterprise Linux Server AUS (v. 7.3) - noarch, x86_64

Red Hat Enterprise Linux Server E4S (v. 7.3) - noarch, ppc64le, x86_64

Red Hat Enterprise Linux Server Optional AUS (v. 7.3) - noarch, x86_64

Red Hat Enterprise Linux Server Optional E4S (v. 7.3) - noarch, ppc64le, x86_64

Red Hat Enterprise Linux Server Optional TUS (v. 7.3) - noarch, x86_64

Red Hat Enterprise Linux Server TUS (v. 7.3) - noarch, 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

1861860 - grub2 should get resynced with 7.8 branch

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