[Snort-sigs] SID 556 RE-contrib (apologies; I misread the rule)

Gene Gomez gegomez at ...1889...
Mon Sep 22 06:58:31 EDT 2003


Rule:  

alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"P2P Outbound GNUTella
client request"; flow:to_server,established; content:"GNUTELLA CONNECT";
depth:40; classtype:policy-violation; sid:556; rev:5;) 

--

Sid:

556

--

Summary:

A network-internal client has connected to an external GNUTella server
and issued a connect attempt to begin 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 client has been detected
on your network.

--

Affected Systems:

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

--

Attack Scenarios:

N/A

--

Ease of Attack:

N/A

--

False Positives:

This rule detects the term "GNUTELLA CONNECT" 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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