CVE-2023-51764

2023-12-2400:00:00

ubuntu.com

postfix 3.8.5

smtp smuggling

cve-2023-51764

spf protection

eol_unix

remote attackers

5.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

5.1 Medium

AI Score

Confidence

High

0.003 Low

EPSS

Percentile

65.3%

JSON

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 <LF>.<CR><LF> but some other popular e-mail servers do not. To
prevent attack variants (by always disallowing <LF> without <CR>), 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.

Bugs

Notes

Author	Note
mdeslaur	We will not be releasing updates for Lunar which is EoL on 2024-01-25

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchpostfix< 3.3.0-1ubuntu0.4+esm3UNKNOWN
ubuntu20.04noarchpostfix< 3.4.13-0ubuntu1.4UNKNOWN
ubuntu22.04noarchpostfix< 3.6.4-1ubuntu1.3UNKNOWN
ubuntu23.10noarchpostfix< 3.8.1-2ubuntu0.2UNKNOWN
ubuntu14.04noarchpostfix< 2.11.0-1ubuntu1.2+esm3UNKNOWN
ubuntu16.04noarchpostfix< 3.1.0-3ubuntu0.4+esm3UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	postfix	< 3.3.0-1ubuntu0.4+esm3	UNKNOWN
ubuntu	20.04	noarch	postfix	< 3.4.13-0ubuntu1.4	UNKNOWN
ubuntu	22.04	noarch	postfix	< 3.6.4-1ubuntu1.3	UNKNOWN
ubuntu	23.10	noarch	postfix	< 3.8.1-2ubuntu0.2	UNKNOWN
ubuntu	14.04	noarch	postfix	< 2.11.0-1ubuntu1.2+esm3	UNKNOWN
ubuntu	16.04	noarch	postfix	< 3.1.0-3ubuntu0.4+esm3	UNKNOWN