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Re: Firewall-1 Security Advisory
From: gaskell () FIT QUT EDU AU (Gary Gaskell)
Date: Wed, 28 Oct 1998 08:02:52 +1000


Dear Alepha One,

I'm on an internal university email list for bugtraq.  Can you pass this
onto the list, as it seems my emails to bugtraq usually get dropped?

Thanks, Gary

------------------cut here-----------------------------------------

And what about the default of the ports 256, 257, 258 and 259 appearing on
every interface?  A little concerning, since they are not listed in the
table of ports in the main manual.  Even more concerning when I'm told
they are for secure remote support, logging and configuration control!
This obscurity makes one rather nervous.

Cheers, Gary

On Tue, 27 Oct 1998, David S. Goldberg wrote:

So the closest thing to a warning, comes not in the manuals that
come with the software - but you have to pay to go on a course for
this info. I may be wrong about this - if you know of any other
place where this is documented please let me know.

The "Managing Firewall-1 Using the Windows GUI" book that comes with
the firewall (both in hardcopy and pdf on the CD) covers this in
Chapter 8.  In Chapter 9 (page 170 in my copy) they list in order the
bits a packet is matched against.

Unfortunately, this documentation is insufficient.  They don't give
any advice as to the implications of doing DNS and ICMP before the
rule base.  In spite of what they might consider a complete
description of how it work, it's easy to miss the security implication
of their default settings, especially when they declare some things
essential, making it seem to the administrator that she'd better leave
the services wide open rather than handle them explicitly in the
rules.

--
Dave Goldberg
Post: The Mitre Corporation\MS B305\202 Burlington Rd.\Bedford, MA 01730
Phone: 781-271-3887
Email: dsg () mitre org


Cheers,

Gary

-----------------------------------------------------------
Gary Gaskell
Manager Secure Network Laboratory      Phone (07) 3864 1190
Information Security Research Centre   Fax   (07) 3221 2384
Queensland University of Technology
-----------------------------------------------------------
      _--_|\
     /      QUT   A University for            http://www.qut.edu.au/
     \_.--._/     the Real World.
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