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ALSA-2024:1902 — Important: shim security update

Affected: AlmaLinux:8: shim-aa64, AlmaLinux:8: shim-ia32, AlmaLinux:8: shim-x64

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):

* shim: RCE in http boot support may lead to Secure Boot bypass (CVE-2023-40547) * shim: Interger overflow leads to heap buffer overflow in verify_sbat_section on 32-bits systems (CVE-2023-40548) * shim: Out-of-bounds read printing error messages (CVE-2023-40546) * shim: Out-of-bounds read in verify_buffer_authenticode() malformed PE file (CVE-2023-40549) * shim: Out-of-bound read in verify_buffer_sbat() (CVE-2023-40550) * shim: out of bounds read when parsing MZ binaries (CVE-2023-40551)

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.

bdu:2024-02895

BELL-CVE-2023-40546

Affected: Alpaquita:23: shim, Alpaquita:23: shim-signed, Alpaquita:stream: shim, Alpaquita:stream: shim-signed

certfr-2024-avi-0470 — De multiples vulnérabilités ont été découvertes dans les produits IBM. Certaines d'entre elles permettent à un attaquan…

certfr-2024-avi-0470

ESBA-2024:0600 — bugfix update for shim 15.8-4.el8_10.1

bugfix update for shim 15.8-4.el8_10.1

EUVD-2026-261554

fkie_cve-2023-40546

A flaw was found in Shim when an error happened while creating a new ESL variable. If Shim fails to create the new variable, it tries to print an error message to the user; however, the number of parameters used by the logging function doesn't match the format string used by it, leading to a crash under certain circumstances.

GHSA-9fh5-955w-9jfh

gsd-2023-40546

msrc_CVE-2023-40546 — Shim: out-of-bounds read printing error messages

msrc_CVE-2023-40546

OESA-2023-1800 — shim security update

Affected: openEuler:22.03-LTS: shim

Initial UEFI bootloader that handles chaining to a trusted full \ bootloader under secure boot environments. Security Fix(es): A vulnerability classified as critical has been found in rhboot shim up to 15.7 on ARM. This affects the function mirror_one_esl of the file mok.c of the component mok. Applying the patch 66e6579dbf921152f647a0c16da1d3b2f40861ca is able to eliminate this problem. The bugfix is ready for download at github.com.(CVE-2023-40546)

RHSA-2024:1834 — Red Hat Security Advisory: shim security update

shim: Out-of-bounds read printing error messages shim: RCE in http boot support may lead to Secure Boot bypass shim: Interger overflow leads to heap buffer overflow in verify_sbat_section on 32-bits systems shim: Out-of-bounds read in verify_buffer_authenticode() malformed PE file shim: Out-of-bound read in verify_buffer_sbat() shim: out of bounds read when parsing MZ binaries

SUSE-SU-2024:1461-1 — Security update for shim

Security update for shim

UBUNTU-CVE-2023-40546

Affected: Ubuntu:14.04:LTS: shim, Ubuntu:14.04:LTS: shim-signed, Ubuntu:16.04:LTS: shim, Ubuntu:16.04:LTS: shim-signed, Ubuntu:18.04:LTS: shim, Ubuntu:18.04:LTS: shim-signed, Ubuntu:20.04:LTS: shim, Ubuntu:20.04:LTS: shim-signed, Ubuntu:22.04:LTS: shim, Ubuntu:22.04:LTS: shim-signed and 2 more

WID-SEC-W-2024-0903 — Red Hat Enterprise Linux (shim): Mehrere Schwachstellen

Ein lokaler Angreifer kann mehrere Schwachstellen in Red Hat Enterprise Linux in "shim" ausnutzen, um einen Denial-of-Service-Zustand zu erzeugen, vertrauliche Informationen offenzulegen oder beliebigen Code auszuführen.