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Alma Linux: CVE-2023-51764: Moderate: postfix security update (ALSA-2024-9243)

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Alma Linux: CVE-2023-51764: Moderate: postfix security update (ALSA-2024-9243)

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:P/A:N)
Published
12/24/2023
Created
11/21/2024
Added
11/19/2024
Modified
01/28/2025

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 <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.

Solution(s)

  • alma-upgrade-postfix
  • alma-upgrade-postfix-cdb
  • alma-upgrade-postfix-ldap
  • alma-upgrade-postfix-lmdb
  • alma-upgrade-postfix-mysql
  • alma-upgrade-postfix-pcre
  • alma-upgrade-postfix-perl-scripts
  • alma-upgrade-postfix-pgsql
  • alma-upgrade-postfix-sqlite

References

  • https://attackerkb.com/topics/cve-2023-51764
  • CVE - 2023-51764
  • https://errata.almalinux.org/9/ALSA-2024-9243.html
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