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Vulnerability · Published Jan 29, 2024 · Assigned by redhat

CVE-2023-40546Shim: out-of-bounds read printing error messages

Medium 6.2

In plain English

A medium-severity null pointer dereference 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)6.2Medium
Exploit odds (30 days)0.4%top 61.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw was found in Shim when an error happened while creating a new ESL variable. If Shim fails to create the new variable, it tries to print an error message to the user; however, the number of parameters used by the logging function doesn't match the format string used by it, leading to a crash under certain circumstances.

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-2023-40546
Debian:13shim15.8-1DEBIAN-CVE-2023-40546
Debian:14shim15.8-1DEBIAN-CVE-2023-40546
Ubuntu:22.04:LTSshim15.8-0ubuntu1UBUNTU-CVE-2023-40546
Ubuntu:24.04:LTSshim15.8-0ubuntu1UBUNTU-CVE-2023-40546
Ubuntu:22.04:LTSshim-signed1.51.4UBUNTU-CVE-2023-40546
Ubuntu:24.04:LTSshim-signed1.58UBUNTU-CVE-2023-40546

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-476 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References