Issued:
2024-04-18
Updated:
2024-04-18

RHSA-2024:1902 - Important: shim security update

Synopsis

Important: shim security update

Type/Severity

Security Advisory Important

Topic

An update for shim is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Important. 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.

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):

  • 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.

Solution

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

Affected Products

ProductVersionArch
Red Hat Enterprise Linux for x86_648x86_64
Red Hat Enterprise Linux for x86_64 - Extended Life Cycle8.10x86_64
Red Hat Enterprise Linux for ARM 648aarch64
Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle8.10aarch64

Updated Packages

  • shim-aa64-15.8-4.el8_9.aarch64.rpm
  • shim-x64-15.8-4.el8_9.x86_64.rpm
  • shim-ia32-15.8-4.el8_9.x86_64.rpm
  • shim-15.8-4.el8_9.src.rpm

Fixes

CVEs

References

Additional information