Bug 2236613 (CVE-2023-4692)

Summary:	CVE-2023-4692 grub2: Out-of-bounds write at fs/ntfs.c may lead to unsigned code execution
Product:	[Other] Security Response	Reporter:	Marco Benatto <mbenatto>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	jaredz, mlewando, pjanda, pjones, pkotvan, rharwood, security-response-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	An out-of-bounds write flaw was found in grub2's NTFS filesystem driver. This issue may allow an attacker to present a specially crafted NTFS filesystem image, leading to grub's heap metadata corruption. In some circumstances, the attack may also corrupt the UEFI firmware heap metadata. As a result, arbitrary code execution and secure boot protection bypass may be achieved.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2241978
Bug Blocks:	2193203

Description Marco Benatto 2023-08-31 22:03:12 UTC

There is an out-of-bounds write in fs/ntfs.c, an attacker may leverage this vulnerability by presenting a specially crafted NTFS filesystem image leading to grub's heap metadata corruption. Additionally, in some circumstances, the attack may also corrupt the UEFI firmware heap metadata. As a result arbitrary code execution and secure boot protection bypass may be achieved.

Comment 2 Marco Benatto 2023-10-03 17:56:07 UTC

Created grub2 tracking bugs for this issue:

Affects: fedora-all [bug 2241978]

Comment 3 Marco Benatto 2023-10-03 18:13:32 UTC

Upstream patch for this issue:
https://lists.gnu.org/archive/html/grub-devel/2023-10/msg00029.html

Comment 4 Marta Lewandowska 2024-03-25 08:27:58 UTC

This is duplicating https://issues.redhat.com/browse/RHEL-11567 which is already set to RELEASE PENDING. I believe this can be closed.

Comment 5 errata-xmlrpc 2024-04-30 10:54:04 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2024:2456 https://access.redhat.com/errata/RHSA-2024:2456

Comment 6 errata-xmlrpc 2024-05-22 10:15:48 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:3184 https://access.redhat.com/errata/RHSA-2024:3184