RHSA-2024:1834 — Security Advisory

An update for shim is now available for Red Hat Enterprise Linux 8.2 Advanced Update Support, Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions, and Red Hat Enterprise Linux 8.2 Telecommunications Update Service.

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.

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.