RHSA-2021:3675 — Security Advisory

An update for fwupd, shim, shim-unsigned-aarch64, and shim-unsigned-x64 is now available for Red Hat Enterprise Linux 8.1 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.

The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot loader under secure boot environments.

The fwupd packages provide a service that allows session software to update device firmware.

The following packages have been upgraded to a later upstream version: shim (15.4). (BZ#1932410)

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.