NOTE regarding sendmail DNS map issue

[Jacques A. Vidrine]

You may or may not have already seen:
  <URL: http://www.sendmail.org/dnsmap1.html>

I thought I'd drop an explanatory note here until I publish an
advisory.  This problem has been known for some time (it was first
reported in FreeBSD PR#54367).  The default configuration of
sendmail is unaffected, and it is unknown whether the issue is truly
exploitable by any means.  Nonetheless, I requested that sendmail.org
publish a notice so that we (FreeBSD) could also publish an advisory
and merge the fix into our security branches ``just in case''.  Since
they have now announced the issue, we'll take care of the advisory
this week.

The fix is already in Sendmail 8.12.9 and so is already in 5.1-RELEASE
and later as well as 4.8-STABLE (but not 4.8-RELEASE).  Also, I
believe the error was introduced in Sendmail 8.12.2, and so it is not
present in FreeBSD releases before 4.5-RELEASE.

Cheers,
-- 
Jacques Vidrine   . NTT/Verio SME      . FreeBSD UNIX       . Heimdal
nectar at celabo.org . jvidrine at verio.net . nectar at freebsd.org . nectar at kth.se