CVE-2023-40547 Shim: rce in http boot support may lead to secure boot bypass
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.
Problem types: cwe_id: CWE-787
description: Out-of-bounds Write
Affected products: vendor: Red Hat
product: Red Hat Enterprise Linux 7
cpes: cpe:/o:redhat:enterprise_linux:7::server
cpe:/o:redhat:enterprise_linux:7::workstation
cpe:/o:redhat:enterprise_linux:7::client
default_status: affected
vendor: Red Hat
product: Red Hat Enterprise Linux 7
cpes: cpe:/o:redhat:enterprise_linux:7::server
cpe:/o:redhat:enterprise_linux:7::workstation
cpe:/o:redhat:enterprise_linux:7::client
default_status: affected
vendor: Red Hat
product: Red Hat Enterprise Linux 8
cpes: cpe:/o:redhat:enterprise_linux:8::baseos
default_status: affected
vendor: Red Hat
product: Red Hat Enterprise Linux 8.2 Advanced Update Support
cpes: cpe:/o:redhat:rhel_tus:8.2::baseos
cpe:/o:redhat:rhel_e4s:8.2::baseos
cpe:/o:redhat:rhel_aus:8.2::baseos
default_status: affected
vendor: Red Hat
product: Red Hat Enterprise Linux 8.2 Telecommunications Update Service
cpes: cpe:/o:redhat:rhel_tus:8.2::baseos
cpe:/o:redhat:rhel_e4s:8.2::baseos
cpe:/o:redhat:rhel_aus:8.2::baseos
default_status: affected
vendor: Red Hat
product: Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions
cpes: cpe:/o:redhat:rhel_tus:8.2::baseos
cpe:/o:redhat:rhel_e4s:8.2::baseos
cpe:/o:redhat:rhel_aus:8.2::baseos
default_status: affected
vendor: Red Hat
product: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
cpes: cpe:/o:redhat:rhel_e4s:8.4::baseos
cpe:/o:redhat:rhel_aus:8.4::baseos
cpe:/o:redhat:rhel_tus:8.4::baseos
default_status: affected
vendor: Red Hat
product: Red Hat Enterprise Linux 8.4 Telecommunications Update Service
cpes: cpe:/o:redhat:rhel_e4s:8.4::baseos
cpe:/o:redhat:rhel_aus:8.4::baseos
cpe:/o:redhat:rhel_tus:8.4::baseos
default_status: affected
vendor: Red Hat
product: Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions
cpes: cpe:/o:redhat:rhel_e4s:8.4::baseos
cpe:/o:redhat:rhel_aus:8.4::baseos
cpe:/o:redhat:rhel_tus:8.4::baseos
default_status: affected
vendor: Red Hat
product: Red Hat Enterprise Linux 8.6 Extended Update Support
cpes: cpe:/o:redhat:rhel_eus:8.6::baseos
default_status: affected
vendor: Red Hat
product: Red Hat Enterprise Linux 8.8 Extended Update Support
cpes: cpe:/o:redhat:rhel_eus:8.8::baseos
cpe:/a:redhat:rhel_eus:8.8::crb
default_status: affected
vendor: Red Hat
product: Red Hat Enterprise Linux 8.8 Extended Update Support
cpes: cpe:/o:redhat:rhel_eus:8.8::baseos
cpe:/a:redhat:rhel_eus:8.8::crb
default_status: affected
vendor: Red Hat
product: Red Hat Enterprise Linux 9
cpes: cpe:/o:redhat:enterprise_linux:9::baseos
default_status: affected
vendor: Red Hat
product: Red Hat Enterprise Linux 9.0 Extended Update Support
cpes: cpe:/a:redhat:rhel_eus:9.0::appstream
cpe:/o:redhat:rhel_eus:9.0::baseos
cpe:/a:redhat:rhel_eus:9.0::crb
default_status: affected
vendor: Red Hat
product: Red Hat Enterprise Linux 9.0 Extended Update Support
cpes: cpe:/a:redhat:rhel_eus:9.0::appstream
cpe:/o:redhat:rhel_eus:9.0::baseos
cpe:/a:redhat:rhel_eus:9.0::crb
default_status: affected
vendor: Red Hat
product: Red Hat Enterprise Linux 9.0 Extended Update Support
cpes: cpe:/a:redhat:rhel_eus:9.0::appstream
cpe:/o:redhat:rhel_eus:9.0::baseos
cpe:/a:redhat:rhel_eus:9.0::crb
default_status: affected
vendor: Red Hat
product: Red Hat Enterprise Linux 9.2 Extended Update Support
cpes: cpe:/o:redhat:rhel_eus:9.2::baseos
default_status: affected
CVSS v3.1: attackComplexity: HIGH
attackVector: ADJACENT_NETWORK
availabilityImpact: HIGH
baseScore: 8.3
baseSeverity: HIGH
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: NONE
scope: CHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
version: 3.1
Credits: lang: en
value: Red Hat would like to thank Bill Demirkapi (Microsoft Security Response Center) for reporting this issue.
Published: 2024-01-25T15:54:23.102Z