Firewalls: Danger of Established packets

Firewalls
(January 1998)

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Subject:	Danger of Established packets
From:	Peter Morissey <ppmorris @ syr . edu>
Date:	Tue, 20 Jan 1998 15:05:30 -0500
To:	firewalls @ greatcircle . com, firewalls-digest @ greatcircle . com

How much danger is involved allowing all established TCP packets in
to a network. Seems like the only damage they could do would be
if someone could spew some data in to a system by hijacking the
session. Seems like this would be rather difficult to do remotely,
without being able to "sniff" the existing session.

Any thoughts?

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