Res: Dealing with port/vulnerability scans
- From: Leandro Marques <djleandro10@xxxxxxxxxxxx>
- Date: Tue, 24 Nov 2009 09:22:46 -0800 (PST)
Hello Tony,
I would enable those signatures, because you can check it in a better way to analyze real scans.
Depending on your IDS/IPS device, you can choose to block/log if it targets more than 10 ports, for example. You can also check the kind of the event. A vuln scan can trigger a lot of signatures related to probes or some specific protocol.
In additional, you can send an Abuse Letter to the owner of this IP.
I hope to be helpful.
Regards.
Leandro Marques
----- Mensagem original ----
De: Tony Raboza <tonyraboza@xxxxxxxxx>
Para: security-basics@xxxxxxxxxxxxxxxxx
Enviadas: Terça-feira, 24 de Novembro de 2009 10:29:18
Assunto: Dealing with port/vulnerability scans
Hi,
I'm tuning my IDS and I'm thinking of taking out the portscan/web
vulnerability scan rules. Why? Because, yes - I know that somebody
may be scanning my network - but, what can I do about it?
1. Block the IP? But, what if its NAT - meaning only 1
workstation/user did the port scanning, I would be blocking all the
possibly valid users behind that IP.
2. Report it to their ISP or to them? Then what?
I want my IDS console not to be too cluttered that's why I'm tuning
it. If its too cluttered - I might be missing out the really
important alerts.
What about you? How do you deal with port/vulnerability scans? Is it
illegal btw?
Thanks.
Best,
Tony
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