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Vulnerability · Published Jan 29, 2024 · Assigned by redhat

CVE-2023-40548Shim: interger overflow leads to heap buffer overflow in verify_sbat_section on 32-bits systems

High 7.4

In plain English

A high-severity integer overflow in Red Hat Enterprise Linux 7 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.4High
Exploit odds (30 days)0.4%top 62.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8shim-aa6415.8-4.el8_9.alma.1ALSA-2024:1902
AlmaLinux:9shim-aa6415.8-4.el9_3.alma.1ALSA-2024:1903
AlmaLinux:8shim-ia3215.8-4.el8_9.alma.1ALSA-2024:1902
AlmaLinux:8shim-x6415.8-4.el8_9.alma.1ALSA-2024:1902
AlmaLinux:9shim-x6415.8-4.el9_3.alma.1ALSA-2024:1903
Debian:12shim15.8-1~deb12u1DEBIAN-CVE-2023-40548
Debian:13shim15.8-1DEBIAN-CVE-2023-40548
Debian:14shim15.8-1DEBIAN-CVE-2023-40548
Ubuntu:22.04:LTSshim15.8-0ubuntu1UBUNTU-CVE-2023-40548
Ubuntu:24.04:LTSshim15.8-0ubuntu1UBUNTU-CVE-2023-40548
Ubuntu:22.04:LTSshim-signed1.51.4UBUNTU-CVE-2023-40548
Ubuntu:24.04:LTSshim-signed1.58UBUNTU-CVE-2023-40548

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support see references
Red Hat Red Hat Enterprise Linux 8.2 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support see references

Weakness: CWE-190 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References