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Date:      Mon, 29 May 2000 15:52:24 -0400
From:      Nathan Vidican <webmaster@wmptl.com>
To:        security@freebsd.org
Subject:   ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-96:03.sendmail-suggestion.asc
Message-ID:  <3932CA78.551BCAF2@wmptl.com>
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The following is an excerpt taken from
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-96:03.sendmail-suggestion.asc,
please note that the subject seems to shift from sendmail over to Apache
under the section 'IV. Solution(s)'. I may be wrong here, but
nonetheless I assumed it'd be worth writting about. Seems like a typo to
me?


II.  Problem Description

     Sendmail has the ability to deliver mail to a program on the
     local system via a pipe.  This feature is often used to
     support automatic mail filtering and vacation programs.

     This provides a very flexible way to deliver information to
     an automated task running on a mailserver.  Unfortunately,
     this allows unprivileged users to write tasks that may not
     properly check for common attacks via the program delivery
     system.

     The next release of FreeBSD will now install the sendmail
     restricted shell utility, smrsh in /usr/libexec and create
     the directory /usr/libexec/sm.bin to hold programs that
     may be executed by sendmail to deliver mail to pipes.


III. Impact

     There is no known security impact on FreeBSD systems at the
     of this document's publication.  There is no direct requirement
     to install the smrsh utility.

     The FreeBSD Project suggests using smrsh in conjunction with
     sendmail in environments where the local system administrator
     believes there is a need to protect against as-of-yet undiscovered
     security holes in sendmail.

     Use of this utility is /not/ enabled by default in standard
     sendmail configuration files distributed by FreeBSD to retain
     backwards compatibility with previous sendmail operation.  Use
     of this utility may break functionality that users expect.
     Please read the smrsh(8) manual page and/or the README file in
     /usr/src/usr.sbin/sendmail/smrsh BEFORE attempting to use smrsh.


IV. Solution(s)

     This program is available in the 2.1-stable and 2.2-current
     source code distributions.  It is not compiled, installed,
     or enabled in FreeBSD 2.1.0 by default.

     The Apache Group released version 1.05 of the daemon which fixes
     this vulnerability.  The FreeBSD Project updated the ports and
     packages system to use this new daemon.

     Interested parties may obtain an updated pre-compiled FreeBSD
     package from:

    
ftp://ftp.freebsd.org/pub/FreeBSD/packages-current/www/apache-1.0.5.tgz

     and an updated "automatic port" from the directory hierarchy:

     ftp://ftp.freebsd.org/pub/FreeBSD/ports-current/www/apache.tar.gz


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