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[slackware-security] postfix (SSA:2024-022-01)

Posted on 23 January 2024
Slackware Security

[slackware-security] postfix (SSA:2024-022-01)

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-3.6.14-i586-1_slack15.0.txz: Upgraded.
Security (inbound SMTP smuggling): with "smtpd_forbid_bare_newline
= normalize" (default "no" for Postfix < 3.9), the Postfix
SMTP server requires the standard End-of-DATA sequence
<CR><LF>.<CR><LF>, and otherwise allows command or message
content lines ending in the non-standard <LF>, processing
them as if the client sent the standard <CR><LF>.
The alternative setting, "smtpd_forbid_bare_newline = reject"
will reject any command or message that contains a bare
<LF>, and is more likely to cause problems with legitimate
For backwards compatibility, local clients are excluded by
default with "smtpd_forbid_bare_newline_exclusions = $mynetworks".
For more information, see:
(* Security fix *)

Where to find the new packages:

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

Also see the "Get Slack" section on http://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:
294738922ff08821267867f0bc877f20 postfix-3.6.14-i586-1_slack15.0.txz

Slackware x86_64 15.0 package:
e82bb102cc325850e48aca41f909e812 postfix-3.6.14-x86_64-1_slack15.0.txz

Slackware -current package:
7e088581a14eb986f767bc08d9203103 n/postfix-3.8.5-i586-1.txz

Slackware x86_64 -current package:
50f7d14d0ddc0ce62e29cb55a2cffa31 n/postfix-3.8.5-x86_64-1.txz

Installation instructions:

Upgrade the package as root:
# upgradepkg postfix-3.6.14-i586-1_slack15.0.txz

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


Slackware Linux Security Team