CVE-2023-51764

Severity CVSS v4.0:

Pending analysis

Type:

CWE-345 Insufficient Verification of Data Authenticity

Publication date:

24/12/2023

Last modified:

10/06/2024

Description

Postfix through 3.8.5 allows SMTP smuggling unless configured with smtpd_data_restrictions=reject_unauth_pipelining and smtpd_discard_ehlo_keywords=chunking (or certain other options that exist in recent versions). Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because Postfix supports . but some other popular e-mail servers do not. To prevent attack variants (by always disallowing without ), a different solution is required, such as the smtpd_forbid_bare_newline=yes option with a Postfix minimum version of 3.5.23, 3.6.13, 3.7.9, 3.8.4, or 3.9.

Impact

Vector 3.x

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

Base Score: 5.30 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

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

Base Score 3.x

5.30

Severity 3.x

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:postfix:postfix::::::::		3.5.23 (excluding)
cpe:2.3:a:postfix:postfix::::::::	3.6.0 (including)	3.6.13 (excluding)
cpe:2.3:a:postfix:postfix::::::::	3.7.0 (including)	3.7.9 (excluding)
cpe:2.3:a:postfix:postfix::::::::	3.8.0 (including)	3.8.4 (excluding)
cpe:2.3:o:fedoraproject:fedora:38:::::::*
cpe:2.3:o:fedoraproject:fedora:39:::::::*
cpe:2.3:o:redhat:enterprise_linux:8.0:::::::*
cpe:2.3:o:redhat:enterprise_linux:9.0:::::::*

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

CVE-2023-51764

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools