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Network Security Snort-Signatures
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Re: [Snort-sigs] False +ves on 2586 -- P2P eDonkey transfer

from [Chich Thierry] Network Security [Permanent Link]
Subject: Re: [Snort-sigs] False +ves on 2586 -- P2P eDonkey transfer
Date: Fri, 12 Nov 2004 09:21:49 +0100 
Russell Fulton wrote:

GEN:SID 1:2586 Message P2P eDonkey transfer 

Rule alert tcp $HOME_NET 4242 <> $EXTERNAL_NET any (msg:"P2P eDonkey
transfer"; flow:established; content:"|E3|"; depth:1;
reference:url,www.kom.e-technik.tu-darmstadt.de/publications/abstracts/HB02-1.html;
 classtype:policy-violation; sid:2586; rev:1;)

I am seeing significant numbers of false +ve on this rule for data
coming back from web servers where the source port happens to be 4242
and the first byte of the packet is 0XE3. I wonder if a to_server would
fix this? (since I don't know the EDonkey protocol it may be the server
that send the E3 in which case this won't work).



It is not possible to specify the servers. Edonkey is a peer to peer program
that allow users to share movies or music (mostly are illegal contents).
However, this rule is not specific enough. I believe we should supress it or
replace with an other one.

Thierry Chich


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