AUSCERT External Security Bulletin Redistribution

                ESB-2003.0594 -- OpenBSD Security Advisory
                         Sendmail bug in DNS maps
                              26 August 2003


        AusCERT Security Bulletin Summary

Product:                sendmail 8.12.x prior to 8.12.9
Publisher:              OpenBSD
Operating System:       OpenBSD 3.2
Impact:                 Reduced Security

- --------------------------BEGIN INCLUDED TEXT--------------------

There is a potential problem in the sendmail 8.12 series with respect
to DNS maps in sendmail 8.12.8 and earlier sendmail 8.12.x versions.
The bug did not exist in versions before 8.12 as the DNS map type
is new to 8.12.  The bug was fixed in 8.12.9, released March 29,
2003 but not labeled as a security fix as it wasn't believed to be
a security bug at the time.  Note that only FEATURE(`enhdnsbl')
uses a DNS map.  We do not have an assessment whether this problem
is exploitable but we want to inform you just in case you distribute
sendmail 8.12.x versions before 8.12.9.

OpenBSD 3.2 shipped with sendmail 8.12.8 and thus has the bug.
OpenBSD 3.3 shipped with sendmail 8.12.9 and does *not* have the bug.

The problem has been fixed in the OpenBSD 3.2-stable branch.
In addition, a patch is available for OpenBSD 3.2:

Please note that this only affects sendmail configurations that use
the "enhdnsbl" feature.  The default OpenBSD sendmail config does
*not* use this.  Unless you have created a custom config that uses
enhdnsbl, you do not need to apply the patch or update sendmail.

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