CVE-2023-40550: Shim: out-of-bound read in verify_buffer_sbat()
First published: Tue Jan 23 2024(Updated: )
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.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/shim | <15.8 | 15.8 |
| Red Hat Shim | <15.8 | |
| Red Hat Fedora | =39 | |
| Red Hat Enterprise Linux | =8.0 | |
| Red Hat Enterprise Linux | =9.0 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://access.redhat.com/errata/RHSA-2024:1834
- https://access.redhat.com/errata/RHSA-2024:1835
- https://access.redhat.com/errata/RHSA-2024:1873
- https://access.redhat.com/errata/RHSA-2024:1876
- https://access.redhat.com/errata/RHSA-2024:1883
- https://access.redhat.com/errata/RHSA-2024:1902
- https://access.redhat.com/errata/RHSA-2024:1903
- https://access.redhat.com/errata/RHSA-2024:1959
- https://access.redhat.com/errata/RHSA-2024:2086
- https://access.redhat.com/security/cve/CVE-2023-40550
- https://bugzilla.redhat.com/show_bug.cgi?id=2259915
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2259916
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2234589#c17
- 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 is classified as an out-of-bounds read vulnerability potentially leading to information disclosure.
How do I fix CVE-2023-40550?
To fix CVE-2023-40550, update the Shim package to version 15.8 or later.
Which software is affected by CVE-2023-40550?
CVE-2023-40550 affects the Shim package versions up to 15.8, and specific versions of Fedora and Red Hat Enterprise Linux.
What type of attack can exploit CVE-2023-40550?
CVE-2023-40550 may be exploited during the system's boot phase to expose sensitive data.
Is there a workaround for CVE-2023-40550?
Currently, there are no documented workarounds for CVE-2023-40550; applying the patch is recommended.
- agent/weakness
- agent/title
- agent/type
- agent/description
- agent/first-publish-date
- agent/severity
- agent/author
- collector/epss-latest
- source/FIRST
- agent/epss
- agent/event
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2023-40550
- agent/software-canonical-lookup
- agent/references
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/source
- agent/softwarecombine
- agent/tags
- collector/nvd-api
- source/NVD
- agent/software-canonical-lookup-request
- package-manager/redhat
- vendor/redhat
- canonical/red hat shim
- vendor/fedoraproject
- canonical/red hat fedora
- version/red hat fedora/39
- canonical/red hat enterprise linux
- version/red hat enterprise linux/8.0
- version/red hat enterprise linux/9.0