Bug 2259915 (CVE-2023-40550) - CVE-2023-40550 shim: Out-of-bound read in verify_buffer_sbat()
Summary: CVE-2023-40550 shim: Out-of-bound read in verify_buffer_sbat()
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2023-40550
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2259916
Blocks: 2234588
TreeView+ depends on / blocked
 
Reported: 2024-01-23 20:13 UTC by Marco Benatto
Modified: 2024-04-29 02:16 UTC (History)
2 users (show)

Fixed In Version: shim 15.8
Doc Type: If docs needed, set a value
Doc Text:
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.
Clone Of:
Environment:
Last Closed: 2024-04-18 07:24:13 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2024:1834 0 None None None 2024-04-16 13:33:33 UTC
Red Hat Product Errata RHSA-2024:1835 0 None None None 2024-04-16 13:41:47 UTC
Red Hat Product Errata RHSA-2024:1873 0 None None None 2024-04-18 01:37:25 UTC
Red Hat Product Errata RHSA-2024:1876 0 None None None 2024-04-18 01:43:02 UTC
Red Hat Product Errata RHSA-2024:1883 0 None None None 2024-04-18 01:51:11 UTC
Red Hat Product Errata RHSA-2024:1902 0 None None None 2024-04-18 07:57:29 UTC
Red Hat Product Errata RHSA-2024:1903 0 None None None 2024-04-18 07:54:53 UTC
Red Hat Product Errata RHSA-2024:1959 0 None None None 2024-04-23 00:47:16 UTC
Red Hat Product Errata RHSA-2024:2086 0 None None None 2024-04-29 02:16:52 UTC

Description Marco Benatto 2024-01-23 20:13:30 UTC 
There's an out of bound read in shim at verify_buffer_sbat() function, which can lead to information disclosure.
Comment 1 Marco Benatto 2024-01-23 20:14:11 UTC 
Created shim tracking bugs for this issue:

Affects: fedora-all [bug 2259916]
Comment 3 Marta Lewandowska 2024-04-16 07:42:28 UTC 
shim 15.8-1.el7 passed sanity testing: signatures on efi binaries are correct, booting VM, netboot / httpboot over ipv4 and ipv6 all pass
Comment 4 Marta Lewandowska 2024-04-16 07:54:39 UTC 
Important update information:
The new shim revokes ALL PREVIOUS VERSIONS of GRUB2. Therefore GRUB2 MUST be updated to the latest version: grub2-2.02-0.87.el7_9.14 (RHSA-2024:128440-02) BEFORE OR SIMULTANEOUSLY with this shim in order for Secure Boot to continue to work. Failure to update GRUB2 will result in an UNBOOTABLE system.
Comment 5 errata-xmlrpc 2024-04-16 13:33:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support
  Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.2 Telecommunications Update Service

Via RHSA-2024:1834 https://access.redhat.com/errata/RHSA-2024:1834
Comment 6 errata-xmlrpc 2024-04-16 13:41:46 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Extended Update Support

Via RHSA-2024:1835 https://access.redhat.com/errata/RHSA-2024:1835
Comment 7 Marta Lewandowska 2024-04-17 10:11:09 UTC 
https://bugzilla.redhat.com/show_bug.cgi?id=2234589#c17
Comment 8 errata-xmlrpc 2024-04-18 01:37:23 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.4 Telecommunications Update Service

Via RHSA-2024:1873 https://access.redhat.com/errata/RHSA-2024:1873
Comment 9 errata-xmlrpc 2024-04-18 01:43:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Extended Update Support

Via RHSA-2024:1876 https://access.redhat.com/errata/RHSA-2024:1876
Comment 10 errata-xmlrpc 2024-04-18 01:51:09 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Extended Update Support

Via RHSA-2024:1883 https://access.redhat.com/errata/RHSA-2024:1883
Comment 11 errata-xmlrpc 2024-04-18 07:54:52 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2024:1903 https://access.redhat.com/errata/RHSA-2024:1903
Comment 12 errata-xmlrpc 2024-04-18 07:57:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:1902 https://access.redhat.com/errata/RHSA-2024:1902
Comment 16 errata-xmlrpc 2024-04-23 00:47:15 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2024:1959 https://access.redhat.com/errata/RHSA-2024:1959
Comment 17 errata-xmlrpc 2024-04-29 02:16:51 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Extended Update Support

Via RHSA-2024:2086 https://access.redhat.com/errata/RHSA-2024:2086
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