ALSA-2022:5095

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ALSA-2022:5095

Summary: Important: grub2, mokutil, shim, and shim-unsigned-x64 security update

Details: 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: Integer underflow in grub_net_recv_ip4_packets (CVE-2022-28733) * grub2: Crafted PNG grayscale images may lead to out-of-bounds write in heap (CVE-2021-3695) * grub2: Crafted PNG image may lead to out-of-bound write during huffman table handling (CVE-2021-3696) * grub2: Crafted JPEG image can lead to buffer underflow write in the heap (CVE-2021-3697) * grub2: Out-of-bound write when handling split HTTP headers (CVE-2022-28734) * grub2: shim_lock verifier allows non-kernel files to be loaded (CVE-2022-28735) * grub2: use-after-free in grub_cmd_chainloader() (CVE-2022-28736) * shim: Buffer overflow when loading crafted EFI images (CVE-2022-28737) 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.

References: https://access.redhat.com/errata/RHSA-2022:5095, https://access.redhat.com/security/cve/CVE-2021-3695, https://access.redhat.com/security/cve/CVE-2021-3696, https://access.redhat.com/security/cve/CVE-2021-3697, https://access.redhat.com/security/cve/CVE-2022-28733, https://access.redhat.com/security/cve/CVE-2022-28734, https://access.redhat.com/security/cve/CVE-2022-28735, https://access.redhat.com/security/cve/CVE-2022-28736, https://access.redhat.com/security/cve/CVE-2022-28737, https://bugzilla.redhat.com/1991685, https://bugzilla.redhat.com/1991686, https://bugzilla.redhat.com/1991687, https://bugzilla.redhat.com/2083339, https://bugzilla.redhat.com/2090463, https://bugzilla.redhat.com/2090857, https://bugzilla.redhat.com/2090899, https://bugzilla.redhat.com/2092613, https://errata.almalinux.org/8/ALSA-2022-5095.html