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Vulnerability · Published Jan 29, 2024 · Assigned by redhat

CVE-2023-40550Shim: out-of-bound read in verify_buffer_sbat()

Medium 5.5

In plain English

A medium-severity out-of-bounds read 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 34% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.4%top 65.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

An out-of-bounds read flaw was found in Shim when it tried to validate the SBAT information. This issue may expose sensitive data during the system's 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-2023-40550
Debian:13shim15.8-1DEBIAN-CVE-2023-40550
Debian:14shim15.8-1DEBIAN-CVE-2023-40550
Ubuntu:22.04:LTSshim15.8-0ubuntu1UBUNTU-CVE-2023-40550
Ubuntu:24.04:LTSshim15.8-0ubuntu1UBUNTU-CVE-2023-40550
Ubuntu:22.04:LTSshim-signed1.51.4UBUNTU-CVE-2023-40550
Ubuntu:24.04:LTSshim-signed1.58UBUNTU-CVE-2023-40550

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-125 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References