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Network Security Snort-Signatures
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Re: [Snort-sigs] revised edonkey sigs using flowbits

from [Russell Fulton] Network Security [Permanent Link]
Subject: Re: [Snort-sigs] revised edonkey sigs using flowbits
Date: Tue, 06 Mar 2007 14:27:00 +1300 


Nigel Houghton wrote:

On  0, Russell Fulton <r.fulton@auckland.ac.nz> wrote:
 
  

The rules need their sids unmangled and revs changed if they are to be
added to the distribution.  Flowbits works fine with udp flows :)
    


This functionality is not enabled in the default snort.conf for 2.6.
Other changes are required.

If you are using stream4, the udp tracking functionality needs to be
compiled into snort, see ./configure --help for details. Also, stream5
is experimental at the moment just so you know.

  


Hmmmm... interesting.  I had not realised that flowbits was tied to the
stream preprocessor (but it is logical of course).  Stream5 was not
enabled on that sensor and it was compiled with default options so I'm
puzzled. 

Could it be that the flowbits on the second sig was just ignored since
stream5 was not in use?  That would explain the result I got

In that case these sigs are not widely useful until stream 5 is on by
default.

Russell.

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