-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ==================================================================== Red Hat Security Advisory Synopsis: Moderate: shim security update Advisory ID: RHSA-2021:1734-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2021:1734 Issue date: 2021-05-18 CVE Names: CVE-2020-14372 CVE-2020-25632 CVE-2020-25647 CVE-2020-27749 CVE-2020-27779 CVE-2021-20225 CVE-2021-20233 ==================================================================== 1. Summary: An update for shim, shim-unsigned-aarch64, and shim-unsigned-x64 is now available for Red Hat Enterprise Linux 8. 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 (v. 8) - aarch64, x86_64 Red Hat Enterprise Linux BaseOS (v. 8) - aarch64, x86_64 3. Description: 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: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled (CVE-2020-14372) * grub2: Use-after-free in rmmod command (CVE-2020-25632) * grub2: Out-of-bounds write in grub_usb_device_initialize() (CVE-2020-25647) * grub2: Stack buffer overflow in grub_parser_split_cmdline() (CVE-2020-27749) * grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled (CVE-2020-27779) * grub2: Heap out-of-bounds write in short form option parser (CVE-2021-20225) * grub2: Heap out-of-bounds write due to miscalculation of space required for quoting (CVE-2021-20233) 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. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.4 Release Notes linked from 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/): 1873150 - CVE-2020-14372 grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled 1879577 - CVE-2020-25632 grub2: Use-after-free in rmmod command 1886936 - CVE-2020-25647 grub2: Out-of-bounds write in grub_usb_device_initialize() 1899966 - CVE-2020-27749 grub2: Stack buffer overflow in grub_parser_split_cmdline() 1900698 - CVE-2020-27779 grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled 1924696 - CVE-2021-20225 grub2: Heap out-of-bounds write in short form option parser 1926263 - CVE-2021-20233 grub2: Heap out-of-bounds write due to miscalculation of space required for quoting 6. Package List: Red Hat Enterprise Linux BaseOS (v. 8): Source: shim-15.4-2.el8_1.src.rpm aarch64: shim-aa64-15.4-2.el8_1.aarch64.rpm x86_64: shim-ia32-15.4-2.el8_1.x86_64.rpm shim-x64-15.4-2.el8_1.x86_64.rpm Red Hat CodeReady Linux Builder (v. 8): Source: shim-unsigned-aarch64-15-7.el8_1.src.rpm shim-unsigned-x64-15.4-4.el8_1.src.rpm aarch64: shim-unsigned-aarch64-15-7.el8_1.aarch64.rpm x86_64: shim-unsigned-x64-15.4-4.el8_1.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-2020-14372 https://access.redhat.com/security/cve/CVE-2020-25632 https://access.redhat.com/security/cve/CVE-2020-25647 https://access.redhat.com/security/cve/CVE-2020-27749 https://access.redhat.com/security/cve/CVE-2020-27779 https://access.redhat.com/security/cve/CVE-2021-20225 https://access.redhat.com/security/cve/CVE-2021-20233 https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/security/vulnerabilities/RHSB-2021-003 https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.4_release_notes/ 8. Contact: The Red Hat security contact is . More contact details at https://access.redhat.com/security/team/contact/ Copyright 2021 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBYKPvONzjgjWX9erEAQjW0w/+OZydzjEMfioyPxScc1pCQWrHoiFX5jZt XnFJCEaMTZZ4g2yx+oRyyJM8Jrd7suk1NAhUDh4V5LkdRk4oaXbtkcLBcOJHTfGV pzcfX3A/kJZ2ZsKogV5Orh06Jiq6aGwsg0YiGoDp4EmG+PGnODMtWvjB8U6KSi1/ aIg19yHmlIVkTaYJQan2LpL7r3pknZyHmuSZPdJxJX7/8coGS7s9rqGwROYnJnHE jiGAVqahVZkHYgvMzjo15occFVr/91C0oCb3GhI2Be1QI+Dvz2VT/xs+aIbum2yZ ioEGBVr9W/f6R8PvwIE+PTkOE2IXqJ/0uO1xuJz/bvdulC+5hXxtsG4RWWW6Sk22 uUN2GNpwF+fF6K4cZ3sdx09U5SHDuUTe1ZIjHALm7sxL4ixpEaptSsJcLoOqjg9/ 36T4REDa90NeY75SpdXNvqQqH8b6rImiTrg8Wvh16lxTT8T+1iAym6sPWb3d/0RP tQ+Dzbvp+ramwsSaATz4BhkmdkDZlaN/Soll5ZPu3Oi3imC/Ocjem2t8MD6sWHLD bwoYx8UXkvsPfu7gzDSmc84PGjl9wcq4AT9wAdZY4rgKwqlbGrBObHKi8tlZ8y3m jwrocmABVkLWYG2s1DqH4LXm8MA1Ka4dmKhRT13BmiTM0h01LeGMCOuPUU2pWW55 6QkP54EN3Hg=PExu -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://listman.redhat.com/mailman/listinfo/rhsa-announce