CVE-2023-40547

8.3 HIGH
Published: January 25, 2024 Modified: June 26, 2026
View on NVD

Description

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://access.redhat.com/security/cve/CVE-2023-40547
Source: secalert@redhat.com
Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2234589
Source: secalert@redhat.com
Issue Tracking Vendor Advisory
http://www.openwall.com/lists/oss-security/2024/01/26/1
Source: af854a3a-2127-422b-91ae-364da2661108
https://access.redhat.com/errata/RHSA-2024:1834
Source: af854a3a-2127-422b-91ae-364da2661108
https://access.redhat.com/errata/RHSA-2024:1835
Source: af854a3a-2127-422b-91ae-364da2661108
https://access.redhat.com/errata/RHSA-2024:1873
Source: af854a3a-2127-422b-91ae-364da2661108
https://access.redhat.com/errata/RHSA-2024:1876
Source: af854a3a-2127-422b-91ae-364da2661108
https://access.redhat.com/errata/RHSA-2024:1883
Source: af854a3a-2127-422b-91ae-364da2661108
https://access.redhat.com/errata/RHSA-2024:1902
Source: af854a3a-2127-422b-91ae-364da2661108
https://access.redhat.com/errata/RHSA-2024:1903
Source: af854a3a-2127-422b-91ae-364da2661108
https://access.redhat.com/errata/RHSA-2024:1959
Source: af854a3a-2127-422b-91ae-364da2661108
https://access.redhat.com/errata/RHSA-2024:2086
Source: af854a3a-2127-422b-91ae-364da2661108
https://access.redhat.com/security/cve/CVE-2023-40547
Source: af854a3a-2127-422b-91ae-364da2661108
Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2234589
Source: af854a3a-2127-422b-91ae-364da2661108
Issue Tracking Vendor Advisory

24 reference(s) from NVD

Quick Stats

CVSS v3 Score
8.3 / 10.0
EPSS (Exploit Probability)
4.9%
91th percentile
Exploitation Status
Not in CISA KEV

Affected Vendors

redhat