Debian dla-3725 : postfix - security update

medium Nessus Plugin ID 189772

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Synopsis

The remote Debian host is missing a security-related update.

Description

The remote Debian 10 host has packages installed that are affected by a vulnerability as referenced in the dla-3725 advisory.

- 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. (CVE-2023-51764)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade the postfix packages.

Plugin Details

Severity: Medium

ID: 189772

File Name: debian_DLA-3725.nasl

Version: 1.0

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 1/30/2024

Updated: 1/30/2024

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.2

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2023-51764

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:postfix, p-cpe:/a:debian:debian_linux:postfix-cdb, p-cpe:/a:debian:debian_linux:postfix-doc, p-cpe:/a:debian:debian_linux:postfix-ldap, p-cpe:/a:debian:debian_linux:postfix-lmdb, p-cpe:/a:debian:debian_linux:postfix-mysql, p-cpe:/a:debian:debian_linux:postfix-pcre, p-cpe:/a:debian:debian_linux:postfix-pgsql, p-cpe:/a:debian:debian_linux:postfix-sqlite, cpe:/o:debian:debian_linux:10.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 1/30/2024

Vulnerability Publication Date: 12/24/2023

Reference Information

CVE: CVE-2023-51764

Detections

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