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    RedHat: RHSA-2020-3274:01 Moderate: grub2 security and bug fix update

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    An update for grub2, shim, shim-signed, and fwupdate is now available for Red Hat Enterprise Linux 7.7 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
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    =====================================================================
                       Red Hat Security Advisory
    
    Synopsis:          Moderate: grub2 security and bug fix update
    Advisory ID:       RHSA-2020:3274-01
    Product:           Red Hat Enterprise Linux
    Advisory URL:      https://access.redhat.com/errata/RHSA-2020:3274
    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, shim-signed, and fwupdate is now available for
    Red Hat Enterprise Linux 7.7 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 Enterprise Linux ComputeNode EUS (v. 7.7) - noarch, x86_64
    Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7) - noarch, x86_64
    Red Hat Enterprise Linux Server EUS (v. 7.7) - noarch, ppc64, ppc64le, x86_64
    Red Hat Enterprise Linux Server Optional EUS (v. 7.7) - 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.
    
    The fwupdate 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.
    
    Bug Fix(es):
    
    * grub2 should get resynced with 7.8 branch (BZ#1861855)
    
    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
    1861855 - grub2 should get resynced with 7.8 branch
    
    6. Package List:
    
    Red Hat Enterprise Linux ComputeNode EUS (v. 7.7):
    
    Source:
    fwupdate-12-6.el7_7.src.rpm
    grub2-2.02-0.86.el7_7.src.rpm
    shim-15-8.el7.src.rpm
    shim-signed-15-8.el7_7.src.rpm
    
    noarch:
    grub2-common-2.02-0.86.el7_7.noarch.rpm
    grub2-efi-ia32-modules-2.02-0.86.el7_7.noarch.rpm
    grub2-efi-x64-modules-2.02-0.86.el7_7.noarch.rpm
    grub2-pc-modules-2.02-0.86.el7_7.noarch.rpm
    shim-unsigned-aa64-debuginfo-15-8.el7.noarch.rpm
    shim-unsigned-ia32-debuginfo-15-8.el7.noarch.rpm
    shim-unsigned-x64-debuginfo-15-8.el7.noarch.rpm
    
    x86_64:
    fwupdate-12-6.el7_7.x86_64.rpm
    fwupdate-debuginfo-12-6.el7_7.x86_64.rpm
    fwupdate-efi-12-6.el7_7.x86_64.rpm
    fwupdate-libs-12-6.el7_7.x86_64.rpm
    grub2-2.02-0.86.el7_7.x86_64.rpm
    grub2-debuginfo-2.02-0.86.el7_7.x86_64.rpm
    grub2-efi-ia32-2.02-0.86.el7_7.x86_64.rpm
    grub2-efi-x64-2.02-0.86.el7_7.x86_64.rpm
    grub2-pc-2.02-0.86.el7_7.x86_64.rpm
    grub2-tools-2.02-0.86.el7_7.x86_64.rpm
    grub2-tools-extra-2.02-0.86.el7_7.x86_64.rpm
    grub2-tools-minimal-2.02-0.86.el7_7.x86_64.rpm
    mokutil-15-8.el7_7.x86_64.rpm
    mokutil-debuginfo-15-8.el7_7.x86_64.rpm
    shim-ia32-15-8.el7_7.x86_64.rpm
    shim-unsigned-ia32-15-8.el7.x86_64.rpm
    shim-unsigned-x64-15-8.el7.x86_64.rpm
    shim-x64-15-8.el7_7.x86_64.rpm
    
    Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7):
    
    noarch:
    grub2-efi-aa64-modules-2.02-0.86.el7_7.noarch.rpm
    grub2-ppc-modules-2.02-0.86.el7_7.noarch.rpm
    grub2-ppc64-modules-2.02-0.86.el7_7.noarch.rpm
    grub2-ppc64le-modules-2.02-0.86.el7_7.noarch.rpm
    
    x86_64:
    fwupdate-debuginfo-12-6.el7_7.x86_64.rpm
    fwupdate-devel-12-6.el7_7.x86_64.rpm
    grub2-debuginfo-2.02-0.86.el7_7.x86_64.rpm
    grub2-efi-ia32-cdboot-2.02-0.86.el7_7.x86_64.rpm
    grub2-efi-x64-cdboot-2.02-0.86.el7_7.x86_64.rpm
    
    Red Hat Enterprise Linux Server EUS (v. 7.7):
    
    Source:
    fwupdate-12-6.el7_7.src.rpm
    grub2-2.02-0.86.el7_7.src.rpm
    shim-15-8.el7.src.rpm
    shim-signed-15-8.el7_7.src.rpm
    
    noarch:
    grub2-common-2.02-0.86.el7_7.noarch.rpm
    grub2-efi-ia32-modules-2.02-0.86.el7_7.noarch.rpm
    grub2-efi-x64-modules-2.02-0.86.el7_7.noarch.rpm
    grub2-pc-modules-2.02-0.86.el7_7.noarch.rpm
    grub2-ppc64-modules-2.02-0.86.el7_7.noarch.rpm
    grub2-ppc64le-modules-2.02-0.86.el7_7.noarch.rpm
    shim-unsigned-aa64-debuginfo-15-8.el7.noarch.rpm
    shim-unsigned-ia32-debuginfo-15-8.el7.noarch.rpm
    shim-unsigned-x64-debuginfo-15-8.el7.noarch.rpm
    
    ppc64:
    grub2-2.02-0.86.el7_7.ppc64.rpm
    grub2-debuginfo-2.02-0.86.el7_7.ppc64.rpm
    grub2-ppc64-2.02-0.86.el7_7.ppc64.rpm
    grub2-tools-2.02-0.86.el7_7.ppc64.rpm
    grub2-tools-extra-2.02-0.86.el7_7.ppc64.rpm
    grub2-tools-minimal-2.02-0.86.el7_7.ppc64.rpm
    
    ppc64le:
    grub2-2.02-0.86.el7_7.ppc64le.rpm
    grub2-debuginfo-2.02-0.86.el7_7.ppc64le.rpm
    grub2-ppc64le-2.02-0.86.el7_7.ppc64le.rpm
    grub2-tools-2.02-0.86.el7_7.ppc64le.rpm
    grub2-tools-extra-2.02-0.86.el7_7.ppc64le.rpm
    grub2-tools-minimal-2.02-0.86.el7_7.ppc64le.rpm
    
    x86_64:
    fwupdate-12-6.el7_7.x86_64.rpm
    fwupdate-debuginfo-12-6.el7_7.x86_64.rpm
    fwupdate-efi-12-6.el7_7.x86_64.rpm
    fwupdate-libs-12-6.el7_7.x86_64.rpm
    grub2-2.02-0.86.el7_7.x86_64.rpm
    grub2-debuginfo-2.02-0.86.el7_7.x86_64.rpm
    grub2-efi-ia32-2.02-0.86.el7_7.x86_64.rpm
    grub2-efi-x64-2.02-0.86.el7_7.x86_64.rpm
    grub2-pc-2.02-0.86.el7_7.x86_64.rpm
    grub2-tools-2.02-0.86.el7_7.x86_64.rpm
    grub2-tools-extra-2.02-0.86.el7_7.x86_64.rpm
    grub2-tools-minimal-2.02-0.86.el7_7.x86_64.rpm
    mokutil-15-8.el7_7.x86_64.rpm
    mokutil-debuginfo-15-8.el7_7.x86_64.rpm
    shim-ia32-15-8.el7_7.x86_64.rpm
    shim-unsigned-ia32-15-8.el7.x86_64.rpm
    shim-unsigned-x64-15-8.el7.x86_64.rpm
    shim-x64-15-8.el7_7.x86_64.rpm
    
    Red Hat Enterprise Linux Server Optional EUS (v. 7.7):
    
    noarch:
    grub2-efi-aa64-modules-2.02-0.86.el7_7.noarch.rpm
    grub2-efi-ia32-modules-2.02-0.86.el7_7.noarch.rpm
    grub2-efi-x64-modules-2.02-0.86.el7_7.noarch.rpm
    grub2-pc-modules-2.02-0.86.el7_7.noarch.rpm
    grub2-ppc-modules-2.02-0.86.el7_7.noarch.rpm
    grub2-ppc64-modules-2.02-0.86.el7_7.noarch.rpm
    grub2-ppc64le-modules-2.02-0.86.el7_7.noarch.rpm
    
    x86_64:
    fwupdate-debuginfo-12-6.el7_7.x86_64.rpm
    fwupdate-devel-12-6.el7_7.x86_64.rpm
    grub2-debuginfo-2.02-0.86.el7_7.x86_64.rpm
    grub2-efi-ia32-cdboot-2.02-0.86.el7_7.x86_64.rpm
    grub2-efi-x64-cdboot-2.02-0.86.el7_7.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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