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[slackware-security]  postfix (SSA:2023-356-01)

New postfix packages are available for Slackware 15.0 and -current to
fix a security issue.


Here are the details from the Slackware 15.0 ChangeLog:
+--------------------------+
patches/packages/postfix-3.6.13-i586-1_slack15.0.txz:  Upgraded.
  Security: this release adds support to defend against an email spoofing
  attack (SMTP smuggling) on recipients at a Postfix server. 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.
  For more information, see:
    https://www.postfix.org/smtp-smuggling.html
  (* Security fix *)
+--------------------------+


Where to find the new packages:
+-----------------------------+

Thanks to the friendly folks at the OSU Open Source Lab
(https://osuosl.org/) for donating FTP and rsync hosting
to the Slackware project!  :-)

Also see the "Get Slack" section on http://www.slackware.com/ for
additional mirror sites near you.

Updated package for Slackware 15.0:

Updated package for Slackware x86_64 15.0:

Updated package for Slackware -current:

Updated package for Slackware x86_64 -current:


MD5 signatures:
+-------------+

Slackware 15.0 package:
1d5c7eec8f39a89e957abf39a1e79560  postfix-3.6.13-i586-1_slack15.0.txz

Slackware x86_64 15.0 package:
7286fabbc87a7dfdcc2b1ab4c6c2f4f5  postfix-3.6.13-x86_64-1_slack15.0.txz

Slackware -current package:
27f27ac76a52652599dc7b7d885fa4e1  n/postfix-3.8.4-i586-1.txz

Slackware x86_64 -current package:
c49061c599d2667dbea79227b8e6bb18  n/postfix-3.8.4-x86_64-1.txz


Installation instructions:
+------------------------+

Upgrade the package as root:
# upgradepkg postfix-3.6.13-i586-1_slack15.0.txz

Restart the postfix server:
# /etc/rc.d/rc.postfix restart


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