vulnerability

Ubuntu: (Multiple Advisories) (CVE-2023-51764): Postfix vulnerability

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:P/A:N)
Published
Dec 24, 2023
Added
Jan 23, 2024
Modified
Jan 28, 2025

Description

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

Solution

ubuntu-pro-upgrade-postfix
Title
NEW

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