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    RedHat: RHSA-2020-3276:01 Moderate: grub2 security and bug fix update

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    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.
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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 . More contact
    details at https://access.redhat.com/security/team/contact/
    
    Copyright 2020 Red Hat, Inc.
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