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Date: Fri, 22 Dec 2023 23:45:27 +0100
From: Solar Designer <solar@...nwall.com>
To: oss-security@...ts.openwall.com
Subject: Re: Fwd: [pfx-ann] Postfix stable release 3.8.4
On Fri, Dec 22, 2023 at 05:41:56PM +0100, Solar Designer wrote:
> Subject: [pfx-ann] Postfix stable release 3.8.4
This was followed by almost identical announcements for 3 other stable
branches of Postfix, with the fix included in 3.7.9, 3.6.13, and 3.5.23.
I'm not forwarding those individual messages in here, but I thought it's
relevant to mention that these 4 branches/releases got the fix now.
> [An on-line version of this announcement will be available at https://www.postfix.org/announcements/postfix-3.8.4.html]
>
> Fixed with Postfix 3.8.4:
>
> * Security: this release adds support to defend
> against an email spoofing attack (SMTP smuggling) on
> recipients at a Postfix server. For background, see
> https://www.postfix.org/smtp-smuggling.html.
>
> Sites concerned about SMTP smuggling attacks should enable this
> feature on Internet-facing Postfix servers. For compatibility
> with non-standard clients, Postfix by default excludes clients
> in mynetworks from this countermeasure.
>
> The recommended settings are:
>
> # Optionally disconnect remote SMTP clients that send bare newlines,
> # but allow local clients with non-standard SMTP implementations
> # such as netcat, fax machines, or load balancer health checks.
> #
> smtpd_forbid_bare_newline = yes
> smtpd_forbid_bare_newline_exclusions = $mynetworks
>
> The smtpd_forbid_bare_newline feature is disabled by default.
>
> You can find the updated Postfix source code at the mirrors listed at
> https://www.postfix.org/.
>
> Wietse
> _______________________________________________
> Postfix-announce mailing list -- postfix-announce@...tfix.org
> To unsubscribe send an email to postfix-announce-leave@...tfix.org
>
> ----- End forwarded message -----
Alexander
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