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Re: [USN-74-1] Postfix vulnerability
From: wietse () porcupine org (Wietse Venema)
Date: Sat, 5 Feb 2005 17:09:57 -0500 (EST)

FYI,

This is a bug in a third-party IPv6 patch that is not part of Postfix.

Neither the official Postfix release, nor the work-in-progress
version are not affected by this.

        Wietse

Martin Pitt:
Jean-Samuel Reynaud noticed a programming error in the IPv6 handling
code of Postfix when /proc/net/if_inet6 is not available (which is the
case in Ubuntu since Postfix runs in a chroot). If "permit_mx_backup"
was enabled in the "smtpd_recipient_restrictions", Postfix turned into
an open relay, i. e. erroneously permitted the delivery of arbitrary
mail to any MX host which has an IPv6 address.
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