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CVE-2023-40548

Date: January 29, 2024

A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes memory corruption and can lead to a crash or data integrity issues during the boot phase.

Language: C

Severity Score

Related Resources (15)

https://access.redhat.com/errata/RHSA-2024:2086
https://access.redhat.com/errata/RHSA-2024:1835
https://access.redhat.com/errata/RHSA-2024:1834
https://access.redhat.com/errata/RHSA-2024:1903
https://access.redhat.com/errata/RHSA-2024:1902
https://bugzilla.redhat.com/show_bug.cgi?id=2241782
https://access.redhat.com/errata/RHSA-2024:1959
https://security-tracker.debian.org/tracker/CVE-2023-40548
https://access.redhat.com/errata/RHSA-2024:1873
https://access.redhat.com/errata/RHSA-2024:1883
https://nvd.nist.gov/vuln/detail/CVE-2023-40548
https://access.redhat.com/security/cve/CVE-2023-40548
https://lists.debian.org/debian-lts-announce/2024/05/msg00009.html
https://access.redhat.com/errata/RHSA-2024:1876
https://www.mend.io/vulnerability-database/CVE-2023-40548

Severity Score

Weakness Type (CWE)

Integer Overflow or Wraparound

CWE-190

Out-of-bounds Write

CWE-787

Heap-based Buffer Overflow

CWE-122

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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