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Network Security Snort-Signatures
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Re: [Snort-sigs] SSH brute force attack sig

from [James Riden] Network Security [Permanent Link]
Subject: Re: [Snort-sigs] SSH brute force attack sig
Date: 08 Jul 2005 09:25:21 +1200 
Jeff Kell <jeff-kell@utc.edu> writes:


Matt Jonkman wrote:

True, but we're still not able to use those events to respond or block.
Nor can we set different thresholds for different ports or port ranges.


And P2P searches drive sfportscan nuts, making it essentially useless here.


On the other hand, we *are* interested in P2P and sfportscan is very
useful. Admittedly, I do some post-processing on portscan.log, but
it's really only counting the number of times a source IP has appeared
- I get paged if the dest. port is consistently 22, 135, 445,
etc. sfportscan does have false positives, but after a couple of
hundred events, it's usually worth taking a look at - in this
environment anyway.

cheers,
 Jamie
-- 
James Riden / j.riden@massey.ac.nz / Systems Security Engineer
Information Technology Services, Massey University, NZ.
GPG public key available at: http://www.massey.ac.nz/~jriden/




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