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Re: Port scan causing system crashes
From: "MARTIN M. Bénoni" <benoni_martin () hotmail com>
Date: Thu, 12 Jun 2003 15:23:10 +0000


Well, I have such problems last year as well, on old Sun boxes. The Sun were very loaded with many requests from clients, and the portscan we did made them crash down. However we were running Nmap with the option allowing us to initiate many connetions to many ports at the same time, and this has the same result than a port scan Dos.

Maybe the heavy load the boxes were supporting, and our mutiple scans added to that made the box to fall down.

From: steve.x.jones () royalmail com
To: pen-test () securityfocus com
Subject: Port scan causing system crashes
Date: Thu, 12 Jun 2003 11:23:06 +0000


Please can you help? Has any-one else out there had issues with NMAP port scans
(or any other port scanner) causing systems to crash?

I use Nessus to baseline the security of our systems and have twice had problems
caused by the NMAP port scan on clustered unix boxes running our enterprise
applications. NOTE - it was the initial port scan that caused the problems, not
the subsequent vulnerability assessment.
I've done a quick Google search and found confirmation for one of the systems - BUGTRAQ Vulnerability 3358, "IBM HACMP Port Scan Denial of Service Vulnerability",
the other was a bespoke app running on some HP UX boxes.

Does any-one know of other systems that fall over with a simple port scan?

Up til now I've been running port scans happily across our subnets to look for
rogue FTP, SMTP, HTTP etc, obviously I'll have to take more care now...

Thanks in advance for any help.


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