Insufficient Verification of Data Authenticity Affecting postfix-debugsource package, versions <2:3.5.25-1.el9


Severity

Recommended
0.0
medium
0
10

Based on Rocky Linux security rating.

Threat Intelligence

EPSS
1.01% (84th percentile)

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  • Snyk IDSNYK-ROCKY9-POSTFIXDEBUGSOURCE-9464550
  • published18 Mar 2025
  • disclosed24 Dec 2023

Introduced: 24 Dec 2023

CVE-2023-51764  (opens in a new tab)
CWE-345  (opens in a new tab)

How to fix?

Upgrade Rocky-Linux:9 postfix-debugsource to version 2:3.5.25-1.el9 or higher.
This issue was patched in RLSA-2024:9243.

NVD Description

Note: Versions mentioned in the description apply only to the upstream postfix-debugsource package and not the postfix-debugsource package as distributed by Rocky-Linux. See How to fix? for Rocky-Linux:9 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1