Stuart,

I've come across a similar problem in the course of a PenTest using the #nmap -sU option (UDP scan)
It appears there is no fix till date.
You will find more info. on http://xforce.iss.net/static/7484.php
http://www.remote-exploit.org/downloads.php

Feel free to contact me directly to discuss.

Taiye Lambo, CISSP
Principal Security Consultant
CyberCops Europe (UK)
Mobile: 07958 430 094

In a message dated Fri, 7 Dec 2001 06:07:24 Greenwich Mean Time, "Stuart" <stuart.hackinfobtinternet.com> writes:

> We've run a pentest against a customer recently and found that the very act
> of port scanning their Raptor firewall (running on NT) crippled its ability
> to accept incoming connections for their web site. The firewall is a new
> high spec PIII and the least line is a decent size. The nmap scans were
> standard timing (not T5 or anything daft) - once the scans were stopped,
> things burst back in to life within about 10minutes.
>
> This sounds like a lack of available connections type problem (similar to
> SYN flooding) to me. The firewall was running at about 10% CPU usage at the
> time and was not swapping to disk at all, also strangely, internal access
> outbound to the net for web browsing seemed unaffected?
>
> Its the latest version of Raptor and we're told its fully patched up to
> date.
>
> Does this ring any bells with anyone? Seems very odd to me... a portscan
> should not cause a DOS by itself...
>
>
> thanks
> Stuart
> IT Security Consultant, UK
>
>
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