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- Update from version 3.8.3 to 3.8.4 - Update of rootfile not required - Permanent fix for smtp smuggling will be in version 3.9. However the fix has been backported into version 3.8.4 but with the default for the parameter of "no". - This patch sets the defaults for all the main.cf parameters highlighted by Wietse Venema in http://www.postfix.org/smtp-smuggling.html - Additionally the implementation of smtpd_forbid_bare_newline = yes has been added to the install.sh pak for postfix so that it will be included into any main.cf file being restored from backup. This parameter is available for the first time in 3.8.4 so will not be in any backup prior to this release and can therefore be safely applied to restored versions of main.cf. - This fix in install.sh will be able to be removed when version 3.9 is released early in 2024 as the default for that parameter in that version onwards will then be "yes" - Changelog 3.8.4 Security: with "smtpd_forbid_bare_newline = yes" (default "no" for Postfix < 3.9), reply with "Error: bare <LF> received" and disconnect when an SMTP client sends a line ending in <LF>, violating the RFC 5321 requirement that lines must end in <CR><LF>. This prevents SMTP smuggling attacks that target a recipient at a Postfix server. For backwards compatibility, local clients are excluded by default with "smtpd_forbid_bare_newline_exclusions = $mynetworks". Files: mantools/postlink, proto/postconf.proto, global/mail_params.h, global/smtp_stream.c, global/smtp_stream.h, smtpd/smtpd.c. Signed-off-by: Adolf Belka <adolf.belka@ipfire.org> Reviewed-by: Peter Müller <peter.mueller@ipfire.org>