Vulnerability Details : CVE-2023-40547

A remote code execution vulnerability was found in Shim. The Shim boot support trusts attacker-controlled values when parsing an HTTP response. This flaw allows an attacker to craft a specific malicious HTTP request, leading to a completely controlled out-of-bounds write primitive and complete system compromise. This flaw is only exploitable during the early boot phase, an attacker needs to perform a Man-in-the-Middle or compromise the boot server to be able to exploit this vulnerability successfully.
Published 2024-01-25 16:15:08
Updated 2024-09-16 19:16:06
Source Red Hat, Inc.
View at NVD,   CVE.org
Vulnerability category: Execute code

Products affected by CVE-2023-40547

Exploit prediction scoring system (EPSS) score for CVE-2023-40547

EPSS FAQ
0.54%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 77 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2023-40547

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
8.3
 HIGH CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
1.6
6.0
 NIST 2024-02-08
9.8
 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.9
5.9
 NIST 2024-02-02
8.3
 HIGH CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
1.6
6.0
 Red Hat, Inc. 2024-01-25
8.3
 HIGH CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
N/A
N/A
 MS-CVE-2023-40547 2024-08-13

CWE ids for CVE-2023-40547

  • The product reads data past the end, or before the beginning, of the intended buffer.
    Assigned by: secalert@redhat.com (Primary)
  • The product does not properly verify that the source of data or communication is valid.
    Assigned by:
    • nvd@nist.gov (Secondary)
    • secalert@redhat.com (Secondary)
  • The product writes data past the end, or before the beginning, of the intended buffer.
    Assigned by:
    • nvd@nist.gov (Secondary)
    • secalert@redhat.com (Primary)

References for CVE-2023-40547

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