-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ===================================================================== Red Hat Security Advisory Synopsis: Moderate: grub2 security and bug fix update Advisory ID: RHSA-2020:3273-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2020:3273 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 ===================================================================== 1. Summary: An update for grub2, shim, and shim-signed is now available for Red Hat Enterprise Linux 7.2 Advanced 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 Server AUS (v. 7.2) - noarch, x86_64 Red Hat Enterprise Linux Server Optional AUS (v. 7.2) - 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) 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#1861861) 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 1861861 - grub2 should get resynced with 7.8 branch 6. Package List: Red Hat Enterprise Linux Server AUS (v. 7.2): Source: grub2-2.02-0.86.el7_2.src.rpm shim-15-8.el7.src.rpm shim-signed-15-8.el7_2.src.rpm noarch: grub2-common-2.02-0.86.el7_2.noarch.rpm grub2-efi-ia32-modules-2.02-0.86.el7_2.noarch.rpm grub2-efi-x64-modules-2.02-0.86.el7_2.noarch.rpm grub2-pc-modules-2.02-0.86.el7_2.noarch.rpm grub2-ppc64-modules-2.02-0.86.el7_2.noarch.rpm grub2-ppc64le-modules-2.02-0.86.el7_2.noarch.rpm shim-unsigned-aa64-debuginfo-15-8.el7.noarch.rpm shim-unsigned-x64-debuginfo-15-8.el7.noarch.rpm x86_64: grub2-2.02-0.86.el7_2.x86_64.rpm grub2-debuginfo-2.02-0.86.el7_2.x86_64.rpm grub2-efi-ia32-2.02-0.86.el7_2.x86_64.rpm grub2-efi-x64-2.02-0.86.el7_2.x86_64.rpm grub2-pc-2.02-0.86.el7_2.x86_64.rpm grub2-tools-2.02-0.86.el7_2.x86_64.rpm grub2-tools-extra-2.02-0.86.el7_2.x86_64.rpm grub2-tools-minimal-2.02-0.86.el7_2.x86_64.rpm mokutil-15-8.el7_2.x86_64.rpm mokutil-debuginfo-15-8.el7_2.x86_64.rpm shim-15-8.el7_2.x86_64.rpm Red Hat Enterprise Linux Server Optional AUS (v. 7.2): Source: grub2-2.02-0.86.el7_2.src.rpm shim-15-8.el7.src.rpm noarch: grub2-efi-aa64-modules-2.02-0.86.el7_2.noarch.rpm grub2-efi-ia32-modules-2.02-0.86.el7_2.noarch.rpm grub2-efi-x64-modules-2.02-0.86.el7_2.noarch.rpm grub2-pc-modules-2.02-0.86.el7_2.noarch.rpm grub2-ppc-modules-2.02-0.86.el7_2.noarch.rpm grub2-ppc64-modules-2.02-0.86.el7_2.noarch.rpm grub2-ppc64le-modules-2.02-0.86.el7_2.noarch.rpm x86_64: grub2-debuginfo-2.02-0.86.el7_2.x86_64.rpm grub2-efi-ia32-cdboot-2.02-0.86.el7_2.x86_64.rpm grub2-efi-x64-cdboot-2.02-0.86.el7_2.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/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. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBXyftytzjgjWX9erEAQhJ3BAAjary2rWbJ8Ql2gYBdjcSYPErQtUTdYnw abEzjMANIl9i5L/pe0I0hJIcyTtKDkSyOJDE6kZfr7YUBuAI9GsU4FIc6cbbn7HE gqRb5A6bOtiUXwgZ5EvGYVJa4kt6C7+DjjzmII8VHkcnzPpCeCfpDdlYTTfL8kiY Cx1zdU6k54hyhbRvzZLjk74jsQh/cPa8yaPAK7jm2afOphdGVWH7fCrM0wmFm8OF q431G+2uscp2Pvh4H5wiKoj4SP4k7KDCnOQyIK2Uw4JsZqCp6evS0EuevaaT1GOW 0NSJxiPsst+y+iwAv8ADXP00exdMjWHavY2eDepHNMGodFJ5FDQEf0PjBuSta0dX RAglsED3r4y+rwe2A8u97bKtZglGJxvf1Wt4u1bqSLX8RuydVMOo1YCuueqkuV9b jFCPeY4jJ8hOXQ3bMQOAaQCAeAO8AJluNQFzmfKkl+LTCEBZs9Lqxwu3IzQLKVTY /qCe88eSnxcMqCRu/3OnyghbA6JMKFiYrI51pu8FOXrYSPD1D5KWYFJQNdL1bWms dqv06H1Y9Ho8Bh4uaHfdc7YKUU7gyCgoq7F4tMOHesoNLkAgsnt82rLlYSsImRca udluevoSvRa4gySTSljYE48M6QbdVKx3w8fLLlIGmaPpsMtwBUCMRmQJDNVO1yr+ sDz5oTR0Hsk= =2uGL -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce