[Snort-sigs] SID 557 RE-contrib (apologies; I misread the rule)
gegomez at ...1889...
Mon Sep 22 06:58:27 EDT 2003
alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"P2P GNUTella client
request"; flow:to_server,established; content:"GNUTELLA OK"; depth:40;
classtype:policy-violation; sid:557; rev:6;)
A network-internal server has okayed an external GNUTella client
connection attempt and they have begun communications.
Possible policy violation.
GNUTella is a P2P (Peer-to-Peer) protocol for exchanging arbitrary
files. Depending on your site's policies, using it may be a policy
If not propely configured, GNUTella clients may accidentally share out
confidential files. GNUTella worms (which use deceptive names to
encourage download) and viruses may also be accidentally downloaded by a
This rule being triggered means that a GNUTella server has been detected
on your network.
Any system with a GNUTella server installed (available for most
Ease of Attack:
This rule detects the term "GNUTELLA OK" on all ports. As a result, any
email, web page, or other network content that discusses the protocol
and its messages will trigger this alert.
Depends on acceptable use policies.
Gene R Gomez (gene!AT!gomezbrothers!DOT!com)
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