CVE-2023-40550

Shim: out-of-bound read in verify_buffer_sbat()

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.

Category

5.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.02%
Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com
Affected: Red Hat Red Hat Enterprise Linux 7
Affected: Red Hat Red Hat Enterprise Linux 7
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support
Affected: Red Hat Red Hat Enterprise Linux 8.2 Telecommunications Update Service
Affected: Red Hat Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions
Affected: Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
Affected: Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service
Affected: Red Hat Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions
Affected: Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support
Affected: Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support
Affected: Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support
Affected: Red Hat Red Hat Enterprise Linux 9
Affected: Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support
Affected: Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support
Affected: Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support
Affected: Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/errata/RHSA-2024:1834 vendor advisory
https://access.redhat.com/errata/RHSA-2024:1835 vendor advisory
https://access.redhat.com/errata/RHSA-2024:1873 vendor advisory
https://access.redhat.com/errata/RHSA-2024:1876 vendor advisory
https://access.redhat.com/errata/RHSA-2024:1883 vendor advisory
https://access.redhat.com/errata/RHSA-2024:1902 vendor advisory
https://access.redhat.com/errata/RHSA-2024:1903 vendor advisory
https://access.redhat.com/errata/RHSA-2024:1959 vendor advisory
https://access.redhat.com/errata/RHSA-2024:2086 vendor advisory
https://access.redhat.com/security/cve/CVE-2023-40550 vdb entry vendor advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2259915 issue tracking vendor advisory
https://lists.debian.org/debian-lts-announce/2024/05/msg00009.html

Frequently Asked Questions

What is the severity of CVE-2023-40550?
CVE-2023-40550 has been scored as a medium severity vulnerability.
How to fix CVE-2023-40550?
To fix CVE-2023-40550, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-40550 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-40550 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-40550?
CVE-2023-40550 affects Red Hat Red Hat Enterprise Linux 7, Red Hat Red Hat Enterprise Linux 7, Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support, Red Hat Red Hat Enterprise Linux 8.2 Telecommunications Update Service, Red Hat Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions, Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service, Red Hat Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions, Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support, Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support, Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support, Red Hat Red Hat Enterprise Linux 9, Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support, Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support, Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support, Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support.
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