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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 3.8.4 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: 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)

Tenable has extracted the preceding description block directly from the tested product security advisory.

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: 1.2

Type: local

Agent: unix

Published: 1/23/2024

Updated: 12/11/2024

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, 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: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