Linux Distros Unpatched Vulnerability : CVE-2023-51764

medium Nessus Plugin ID 226366

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Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

- 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 relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

Plugin Details

Severity: Medium

ID: 226366

File Name: unpatched_CVE_2023_51764.nasl

Version: 1.4

Type: local

Agent: unix

Family: Misc.

Published: 3/5/2025

Updated: 9/4/2025

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

Risk Information

VPR

Risk Factor: Low

Score: 2.2

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5

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

CVSS Score Source: CVE-2023-51764

Vulnerability Information

CPE: cpe:/o:centos:centos:8, p-cpe:/a:redhat:enterprise_linux:postfix-pgsql, p-cpe:/a:redhat:enterprise_linux:postfix-perl-scripts, p-cpe:/a:centos:centos:postfix-ldap, p-cpe:/a:redhat:enterprise_linux:postfix-mysql, p-cpe:/a:centos:centos:postfix-cdb, p-cpe:/a:redhat:enterprise_linux:postfix-sqlite, p-cpe:/a:centos:centos:postfix-pgsql, p-cpe:/a:centos:centos:postfix-pcre, p-cpe:/a:centos:centos:postfix, cpe:/o:redhat:enterprise_linux:8, p-cpe:/a:redhat:enterprise_linux:postfix, p-cpe:/a:centos:centos:postfix-perl-scripts, p-cpe:/a:redhat:enterprise_linux:postfix-ldap, p-cpe:/a:redhat:enterprise_linux:postfix-pcre, p-cpe:/a:redhat:enterprise_linux:postfix-cdb, p-cpe:/a:centos:centos:postfix-sqlite, p-cpe:/a:centos:centos:postfix-mysql

Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 12/24/2023

Reference Information

CVE: CVE-2023-51764

Detections

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