PT-2024-2762 · Shim+6 · Shim+6
Marco Benatto
·
Published
2023-10-03
·
Updated
2025-03-07
·
CVE-2023-40548
CVSS v3.1
7.4
High
| Vector | AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Shim versions for 32-bit systems
Description
The issue is related to a buffer overflow in the UEFI boot loader shim for 32-bit systems. This overflow occurs due to an addition operation involving a user-controlled value parsed from the PE binary used by shim. The value is further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw can cause memory corruption and may result in a crash or data integrity issues during the boot phase.
Recommendations
For Shim versions for 32-bit systems, consider disabling the vulnerable component until a patch is available to prevent potential exploitation.
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Memory Corruption
Integer Overflow
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Related Identifiers
Affected Products
Alt Linux
Almalinux
Centos
Red Hat
Red Os
Suse
Shim