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====================================================================                   
Red Hat Security Advisory

Synopsis:          Moderate: grub2 security update
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
CVE Names:         CVE-2020-10713 CVE-2020-14308 CVE-2020-14309
                   CVE-2020-14310 CVE-2020-14311 CVE-2020-15705
                   CVE-2020-15706 CVE-2020-15707
====================================================================
1. Summary:

An update for grub2, shim, shim-unsigned-x64, and fwupd is now available
for Red Hat Enterprise Linux 8.1 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. 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

3. Description:

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.

4. 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

5. Bugs fixed (https://bugzilla.redhat.com/):

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

6. 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
grub2-ppc64le-2.02-87.el8_1.ppc64le.rpm
grub2-tools-2.02-87.el8_1.ppc64le.rpm
grub2-tools-debuginfo-2.02-87.el8_1.ppc64le.rpm
grub2-tools-extra-2.02-87.el8_1.ppc64le.rpm
grub2-tools-extra-debuginfo-2.02-87.el8_1.ppc64le.rpm
grub2-tools-minimal-2.02-87.el8_1.ppc64le.rpm
grub2-tools-minimal-debuginfo-2.02-87.el8_1.ppc64le.rpm

s390x:
fwupd-1.1.4-2.el8_1.s390x.rpm
fwupd-debuginfo-1.1.4-2.el8_1.s390x.rpm
fwupd-debugsource-1.1.4-2.el8_1.s390x.rpm

x86_64:
fwupd-1.1.4-2.el8_1.x86_64.rpm
fwupd-debuginfo-1.1.4-2.el8_1.x86_64.rpm
fwupd-debugsource-1.1.4-2.el8_1.x86_64.rpm
grub2-debuginfo-2.02-87.el8_1.x86_64.rpm
grub2-debugsource-2.02-87.el8_1.x86_64.rpm
grub2-efi-ia32-2.02-87.el8_1.x86_64.rpm
grub2-efi-ia32-cdboot-2.02-87.el8_1.x86_64.rpm
grub2-efi-x64-2.02-87.el8_1.x86_64.rpm
grub2-efi-x64-cdboot-2.02-87.el8_1.x86_64.rpm
grub2-pc-2.02-87.el8_1.x86_64.rpm
grub2-tools-2.02-87.el8_1.x86_64.rpm
grub2-tools-debuginfo-2.02-87.el8_1.x86_64.rpm
grub2-tools-efi-2.02-87.el8_1.x86_64.rpm
grub2-tools-efi-debuginfo-2.02-87.el8_1.x86_64.rpm
grub2-tools-extra-2.02-87.el8_1.x86_64.rpm
grub2-tools-extra-debuginfo-2.02-87.el8_1.x86_64.rpm
grub2-tools-minimal-2.02-87.el8_1.x86_64.rpm
grub2-tools-minimal-debuginfo-2.02-87.el8_1.x86_64.rpm
shim-ia32-15-14.el8_1.x86_64.rpm
shim-x64-15-14.el8_1.x86_64.rpm

Red Hat CodeReady Linux Builder EUS (v. 8.1):

Source:
shim-unsigned-x64-15-7.el8.src.rpm

x86_64:
shim-unsigned-x64-15-7.el8.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/

7. 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

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2020 Red Hat, Inc.
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