CVE-2023-40547

CVE Details

Release Date:	2024-01-23
Impact:	Important	What is this?

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.

See more information about CVE-2023-40547 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	8.3
Vector String:	CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Version:	3.0
Attack Vector:	Adjacent_Network
Attack Complexity:	High
Privileges Required:	None
User Interaction:	None
Scope:	Changed
Confidentiality Impact:	High
Integrity Impact:	High
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 7 (shim)	ELSA-2024-1959	2024-05-01
Oracle Linux version 7 (shim-signed)	ELSA-2024-1959	2024-05-01
Oracle Linux version 8 (shim)	ELSA-2024-1902	2024-04-25
Oracle Linux version 9 (shim)	ELSA-2024-1903	2024-04-22