CVE-2023-40548

Shim: interger overflow leads to heap buffer overflow in verify_sbat_section on 32-bits systems

State: Published
Severity: 7.4 High
Published: Jan 29, 2024
Updated: Jun 26, 2026
Reserved: Aug 15, 2023

Description

A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes memory corruption and can lead to a crash or data integrity issues during the boot phase.

Scores

CVSS	Score	Vector	Source
3.1	7.4 High	CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H	redhat

Weaknesses

CWE-190 Integer Overflow or Wraparound

Affected Products

Product	Versions
Red Hat Enterprise Linux 7Red Hat	0:15.8-3.el7 and laterNot affected
Red Hat Enterprise Linux 7Red Hat	0:15.8-1.el7 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:15.8-4.el8_9 and laterNot affected
Red Hat Enterprise Linux 8.2 Advanced Update SupportRed Hat	0:15.8-2.el8_2 and laterNot affected
Red Hat Enterprise Linux 8.2 Telecommunications Update ServiceRed Hat	0:15.8-2.el8_2 and laterNot affected
Red Hat Enterprise Linux 8.2 Update Services for SAP SolutionsRed Hat	0:15.8-2.el8_2 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	0:15.8-2.el8_4 and laterNot affected
Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceRed Hat	0:15.8-2.el8_4 and laterNot affected
Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsRed Hat	0:15.8-2.el8_4 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update SupportRed Hat	0:15.8-2.el8_6 and laterNot affected
Red Hat Enterprise Linux 8.8 Extended Update SupportRed Hat	0:15.8-2.el8 and laterNot affected
Red Hat Enterprise Linux 8.8 Extended Update SupportRed Hat	0:15.8-2.el8 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:15.8-4.el9_3 and laterNot affected
Red Hat Enterprise Linux 9.0 Extended Update SupportRed Hat	0:15.8-3.el9 and laterNot affected
Red Hat Enterprise Linux 9.0 Extended Update SupportRed Hat	0:15.8-2.el9 and laterNot affected
Red Hat Enterprise Linux 9.0 Extended Update SupportRed Hat	0:15.8-2.el9 and laterNot affected
Red Hat Enterprise Linux 9.2 Extended Update SupportRed Hat	0:15.8-3.el9_2 and laterNot affected

References

RHSA-2024:1834vendor-advisory
RHSA-2024:1835vendor-advisory
RHSA-2024:1873vendor-advisory
RHSA-2024:1876vendor-advisory
RHSA-2024:1883vendor-advisory
RHSA-2024:1902vendor-advisory
RHSA-2024:1903vendor-advisory
RHSA-2024:1959vendor-advisory
RHSA-2024:2086vendor-advisory
https://access.redhat.com/security/cve/CVE-2023-40548vdb-entry
RHBZ#2241782issue-tracking
https://lists.debian.org/debian-lts-announce/2024/05/msg00009.html

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