RHSA-2024:1903: Security update for 2 packages

RHSA-2024:1903, released April 18, 2024, fixes 6 CVEs across 2 products. None of them is reported as exploited. Patch Radar priority: Urgent.

Urgent

CVEs closed

1 rated Critical

Exploited

None reported

Highest CVSS

8.3

Base score, 0 to 10

Highest EPSS

0.0542

92nd percentile

Priority of the 6 CVEs

Patch now 0
                                Urgent 1
                                High 1
                                Routine 4

Fixed package versions

Product	Release	Fixed in
shim-aa64	RHEL 9	0:15.8-4.el9_3
shim-x64	RHEL 9	0:15.8-4.el9_3

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
Urgent	CVE-2023-40547	Redhat: CVE-2023-40547 Shim - RCE in HTTP boot support may lead to secure boot bypass	8.3	0.0542	Exploitation Less Likely
High	CVE-2023-40548	shim: A buffer overflow was found in Shim in the 32-bit system	7.4	0.0044	None reported
Routine	CVE-2023-40546	shim: A flaw was found in Shim when an error happened while creating a new ESL variable	6.2	0.0044	None reported
Routine	CVE-2023-40549	shim: An out-of-bounds read flaw was found in Shim due to the lack of properboundary verification during the load of a PE b...	6.2	0.0041	None reported
Routine	CVE-2023-40550	shim: An out-of-bounds read flaw was found in Shim when it tried to validate theSBAT information	5.5	0.0040	None reported
Routine	CVE-2023-40551	shim: A flaw was found in the MZ binary format in Shim	5.1	0.0040	None reported

Also fixes CVE-2023-40547

KB5041573
Windows Server 2022, 23H2 Edition (Server Core installation)
KB5041571
Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems
KB5041580
Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems and 3 more
KB5041585
Windows 11 Version 22H2 for ARM64-based Systems, Windows 11 Version 22H2 for x64-based Systems, Windows 11 Version 23H2 for ARM64-based Systems and 1 more
KB5041773
Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows Server 2016 and 1 more
KB5041782
Windows 10 for 32-bit Systems, Windows 10 for x64-based Systems
KB5041160
Windows Server 2022, Windows Server 2022 (Server Core installation)
KB5041578
Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019 and 1 more

Vendor advisory

https://access.redhat.com/errata/RHSA-2024:1903

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