RedHat: RHSA-2020-3227:01 Moderate: grub2 security update
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.
Summary
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
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 E4S (v. 8.0):
Source:
fwupd-1.1.4-2.el8_0.src.rpm
grub2-2.02-87.el8_0.src.rpm
shim-15-14.el8_0.src.rpm
noarch:
grub2-common-2.02-87.el8_0.noarch.rpm
grub2-efi-aa64-modules-2.02-87.el8_0.noarch.rpm
grub2-efi-ia32-modules-2.02-87.el8_0.noarch.rpm
grub2-efi-x64-modules-2.02-87.el8_0.noarch.rpm
grub2-pc-modules-2.02-87.el8_0.noarch.rpm
grub2-ppc64le-modules-2.02-87.el8_0.noarch.rpm
ppc64le:
fwupd-1.1.4-2.el8_0.ppc64le.rpm
fwupd-debuginfo-1.1.4-2.el8_0.ppc64le.rpm
fwupd-debugsource-1.1.4-2.el8_0.ppc64le.rpm
grub2-debuginfo-2.02-87.el8_0.ppc64le.rpm
grub2-debugsource-2.02-87.el8_0.ppc64le.rpm
grub2-ppc64le-2.02-87.el8_0.ppc64le.rpm
grub2-tools-2.02-87.el8_0.ppc64le.rpm
grub2-tools-debuginfo-2.02-87.el8_0.ppc64le.rpm
grub2-tools-extra-2.02-87.el8_0.ppc64le.rpm
grub2-tools-extra-debuginfo-2.02-87.el8_0.ppc64le.rpm
grub2-tools-minimal-2.02-87.el8_0.ppc64le.rpm
grub2-tools-minimal-debuginfo-2.02-87.el8_0.ppc64le.rpm
x86_64:
fwupd-1.1.4-2.el8_0.x86_64.rpm
fwupd-debuginfo-1.1.4-2.el8_0.x86_64.rpm
fwupd-debugsource-1.1.4-2.el8_0.x86_64.rpm
grub2-debuginfo-2.02-87.el8_0.x86_64.rpm
grub2-debugsource-2.02-87.el8_0.x86_64.rpm
grub2-efi-ia32-2.02-87.el8_0.x86_64.rpm
grub2-efi-ia32-cdboot-2.02-87.el8_0.x86_64.rpm
grub2-efi-x64-2.02-87.el8_0.x86_64.rpm
grub2-efi-x64-cdboot-2.02-87.el8_0.x86_64.rpm
grub2-pc-2.02-87.el8_0.x86_64.rpm
grub2-tools-2.02-87.el8_0.x86_64.rpm
grub2-tools-debuginfo-2.02-87.el8_0.x86_64.rpm
grub2-tools-efi-2.02-87.el8_0.x86_64.rpm
grub2-tools-efi-debuginfo-2.02-87.el8_0.x86_64.rpm
grub2-tools-extra-2.02-87.el8_0.x86_64.rpm
grub2-tools-extra-debuginfo-2.02-87.el8_0.x86_64.rpm
grub2-tools-minimal-2.02-87.el8_0.x86_64.rpm
grub2-tools-minimal-debuginfo-2.02-87.el8_0.x86_64.rpm
shim-ia32-15-14.el8_0.x86_64.rpm
shim-x64-15-14.el8_0.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/
Topic
An update for grub2, shim, and fwupd is now available for Red HatEnterprise Linux 8.0 Update Services 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.
Topic
Relevant Releases Architectures
Red Hat Enterprise Linux BaseOS E4S (v. 8.0) - noarch, ppc64le, 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
