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

Synopsis:          Moderate: grub2 security and bug fix update
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
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, 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, and Red Hat Enterprise Linux 7.3 Update
Services for SAP Solutions.

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 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

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.

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)

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
1861860 - grub2 should get resynced with 7.8 branch

6. 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
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

ppc64le:
grub2-2.02-0.86.el7.ppc64le.rpm
grub2-debuginfo-2.02-0.86.el7.ppc64le.rpm
grub2-ppc64le-2.02-0.86.el7.ppc64le.rpm
grub2-tools-2.02-0.86.el7.ppc64le.rpm
grub2-tools-extra-2.02-0.86.el7.ppc64le.rpm
grub2-tools-minimal-2.02-0.86.el7.ppc64le.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-ia32-cdboot-2.02-0.86.el7.x86_64.rpm
grub2-efi-x64-2.02-0.86.el7.x86_64.rpm
grub2-efi-x64-cdboot-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 TUS (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
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-ia32-cdboot-2.02-0.86.el7.x86_64.rpm
grub2-efi-x64-2.02-0.86.el7.x86_64.rpm
grub2-efi-x64-cdboot-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 Optional AUS (v. 7.3):

Source:
grub2-2.02-0.86.el7.src.rpm
shim-15-8.el7.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
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-ia32-cdboot-2.02-0.86.el7.x86_64.rpm
grub2-efi-x64-2.02-0.86.el7.x86_64.rpm
grub2-efi-x64-cdboot-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
shim-unsigned-ia32-15-8.el7.x86_64.rpm
shim-unsigned-x64-15-8.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional E4S (v. 7.3):

Source:
grub2-2.02-0.86.el7.src.rpm
shim-15-8.el7.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
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

ppc64le:
grub2-2.02-0.86.el7.ppc64le.rpm
grub2-debuginfo-2.02-0.86.el7.ppc64le.rpm
grub2-ppc64le-2.02-0.86.el7.ppc64le.rpm
grub2-tools-2.02-0.86.el7.ppc64le.rpm
grub2-tools-extra-2.02-0.86.el7.ppc64le.rpm
grub2-tools-minimal-2.02-0.86.el7.ppc64le.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-ia32-cdboot-2.02-0.86.el7.x86_64.rpm
grub2-efi-x64-2.02-0.86.el7.x86_64.rpm
grub2-efi-x64-cdboot-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
shim-unsigned-ia32-15-8.el7.x86_64.rpm
shim-unsigned-x64-15-8.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional TUS (v. 7.3):

Source:
grub2-2.02-0.86.el7.src.rpm
shim-15-8.el7.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
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-ia32-cdboot-2.02-0.86.el7.x86_64.rpm
grub2-efi-x64-2.02-0.86.el7.x86_64.rpm
grub2-efi-x64-cdboot-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
shim-unsigned-ia32-15-8.el7.x86_64.rpm
shim-unsigned-x64-15-8.el7.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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