[Snort-sigs] SID 557 RE-contrib (apologies; I misread the rule)

Gene Gomez gegomez at ...1889...
Mon Sep 22 06:58:27 EDT 2003


Rule:  

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;) 

--

Sid:

557

--

Summary:

A network-internal server has okayed an external GNUTella client
connection attempt and they have begun communications.

--

Impact:

Possible policy violation.

--

Detailed Information:

GNUTella is a P2P (Peer-to-Peer) protocol for exchanging arbitrary
files.  Depending on your site's policies, using it may be a policy
violation.

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
client.

This rule being triggered means that a GNUTella server has been detected
on your network.

--

Affected Systems:

Any system with a GNUTella server installed (available for most
platforms)

--

Attack Scenarios:

N/A

--

Ease of Attack:

N/A

--

False Positives:

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.

--

False Negatives:

None known.

--

Corrective Action:

Depends on acceptable use policies.

--

Contributors:

Gene R Gomez (gene!AT!gomezbrothers!DOT!com)

-- 

Additional References:

http://www.gnutella.com

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