CVE-2023-4091

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

03/11/2023

Last modified:

16/09/2024

Description

A vulnerability was discovered in Samba, where the flaw allows SMB clients to truncate files, even with read-only permissions when the Samba VFS module "acl_xattr" is configured with "acl_xattr:ignore system acls = yes". The SMB protocol allows opening files when the client requests read-only access but then implicitly truncates the opened file to 0 bytes if the client specifies a separate OVERWRITE create disposition request. The issue arises in configurations that bypass kernel file system permissions checks, relying solely on Samba&#39;s permissions.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N CVSS v3.1 Severity and Metrics:

Base Score: 6.50 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): High
Availability (A): None

Base Score 3.x

6.50

Severity 3.x

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:samba:samba::::::::		4.17.12 (excluding)
cpe:2.3:a:samba:samba::::::::	4.18.0 (including)	4.18.8 (excluding)
cpe:2.3:a:samba:samba::::::::	4.19.0 (including)	4.19.1 (excluding)
cpe:2.3:o:fedoraproject:fedora:39:::::::*
cpe:2.3:a:redhat:storage:3.0:::::::*
cpe:2.3:o:redhat:enterprise_linux:8.0:::::::*
cpe:2.3:o:redhat:enterprise_linux_eus:9.0:::::::*

To consult the complete list of CPE names with products and versions, see this page

CVE-2023-4091

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools