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Amazon Linux 2023 : postfix, postfix-cdb, postfix-ldap (ALAS2023-2024-495)

medium Nessus Plugin ID 189351

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Synopsis

The remote Amazon Linux 2023 host is missing a security update.

Description

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2024-495 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

Run 'dnf update postfix --releasever 2023.3.20240122' to update your system.

See Also

https://alas.aws.amazon.com/AL2023/ALAS-2024-495.html

https://alas.aws.amazon.com/cve/html/CVE-2023-51764.html

https://alas.aws.amazon.com/faqs.html

Plugin Details

Severity: Medium

ID: 189351

File Name: al2023_ALAS2023-2024-495.nasl

Version: 1.1

Type: local

Agent: unix

Published: 1/23/2024

Updated: 1/23/2024

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, 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:amazon:linux:postfix-cdb-debuginfo, p-cpe:/a:amazon:linux:postfix-ldap, p-cpe:/a:amazon:linux:postfix-cdb, p-cpe:/a:amazon:linux:postfix-pcre, p-cpe:/a:amazon:linux:postfix-mysql, p-cpe:/a:amazon:linux:postfix-pgsql, p-cpe:/a:amazon:linux:postfix-lmdb, p-cpe:/a:amazon:linux:postfix-sqlite, p-cpe:/a:amazon:linux:postfix-ldap-debuginfo, p-cpe:/a:amazon:linux:postfix-debuginfo, p-cpe:/a:amazon:linux:postfix-debugsource, p-cpe:/a:amazon:linux:postfix-sqlite-debuginfo, p-cpe:/a:amazon:linux:postfix-perl-scripts, cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:postfix, p-cpe:/a:amazon:linux:postfix-pgsql-debuginfo, p-cpe:/a:amazon:linux:postfix-pcre-debuginfo, p-cpe:/a:amazon:linux:postfix-mysql-debuginfo, p-cpe:/a:amazon:linux:postfix-lmdb-debuginfo

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 1/19/2024

Vulnerability Publication Date: 12/24/2023

Reference Information

CVE: CVE-2023-51764