CVE-2023-40547

Shim: rce in http boot support may lead to secure boot bypass

HIGH 8.3

En bref

Source: NVD
EPSS: EPSS 5.42 % · centile 93 (2026-10-28)
État: PUBLISHED
Publiée: 2024-01-25 15:54 UTC
Mise à jour: 2026-06-26 09:43 UTC
Attribuée par: redhat
Statut NVD: Modified

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.

Faiblesses (CWE)

CWE-787 — Écriture hors limites
CWE-346 — Erreur de validation de l'origine

Références

Scores

Version	Score	Vecteur	Évalué par
CVSS 3.1	HIGH 8.3	CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H	redhat
CVSS 3.1	HIGH 8.3	CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H	NVD · secalert@redhat.com (Secondary)
CVSS 3.1	HIGH 8.3	CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H	NVD · nvd@nist.gov (Primary)

Références européennes

ENISA EUVD · EUVD-2023-45118
GCVE · GCVE-0-2023-40547

Avis du CERT-FR

CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
CERTFR-2024-AVI-0681 — Multiples vulnérabilités dans Microsoft Windows · cert.ssi.gouv.fr
CERTFR-2024-AVI-0506 — Multiples vulnérabilités dans Juniper Secure Analytics · cert.ssi.gouv.fr
CERTFR-2024-AVI-0470 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr

Configurations affectées (CPE NVD)

cpe:2.3:a:redhat:shim:*:*:*:*:*:*:*:* < 15.8
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*

Produits affectés

Produit	Versions
Red Hat · Red Hat Enterprise Linux 7	unaffected 0:15.8-3.el7 < *
Red Hat · Red Hat Enterprise Linux 7	unaffected 0:15.8-1.el7 < *
Red Hat · Red Hat Enterprise Linux 8	unaffected 0:15.8-4.el8_9 < *
Red Hat · Red Hat Enterprise Linux 8.2 Advanced Update Support	unaffected 0:15.8-2.el8_2 < *
Red Hat · Red Hat Enterprise Linux 8.2 Telecommunications Update Service	unaffected 0:15.8-2.el8_2 < *
Red Hat · Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions	unaffected 0:15.8-2.el8_2 < *
Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	unaffected 0:15.8-2.el8_4 < *
Red Hat · Red Hat Enterprise Linux 8.4 Telecommunications Update Service	unaffected 0:15.8-2.el8_4 < *
Red Hat · Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions	unaffected 0:15.8-2.el8_4 < *
Red Hat · Red Hat Enterprise Linux 8.6 Extended Update Support	unaffected 0:15.8-2.el8_6 < *
Red Hat · Red Hat Enterprise Linux 8.8 Extended Update Support	unaffected 0:15.8-2.el8 < *
Red Hat · Red Hat Enterprise Linux 8.8 Extended Update Support	unaffected 0:15.8-2.el8 < *
Red Hat · Red Hat Enterprise Linux 9	unaffected 0:15.8-4.el9_3 < *
Red Hat · Red Hat Enterprise Linux 9.0 Extended Update Support	unaffected 0:15.8-3.el9 < *
Red Hat · Red Hat Enterprise Linux 9.0 Extended Update Support	unaffected 0:15.8-2.el9 < *
Red Hat · Red Hat Enterprise Linux 9.0 Extended Update Support	unaffected 0:15.8-2.el9 < *
Red Hat · Red Hat Enterprise Linux 9.2 Extended Update Support	unaffected 0:15.8-3.el9_2 < *

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD