Experimental Physics and
Industrial Control System

Folks,

We have definitely seen these problems with PowerPC processors
(MVME2700) on vxWorks 5.4. The problem is quite easy to cause, simply
send large ping packets to the IOC as fast as possible (required root
priv on Linux). The IOC will lose all network connectivity and never
recover.

This behavior was happening on our IOCs at the NSLS at Brookhaven, and
we are 99% sure it was happening when their computer group did network
scans.  We would ask them to not scan the IOC IP addresses, and they
would remember that for a while, then forget and crash the IOCs.  We
finally just put 2 network cards in the computers at the beamlines and
put the IOCs on a private subnet that cannot be scanned.

Mark

-----Original Message-----
From: Jeff Hill [mailto:[email protected]] Sent: Monday, February 06, 2006 11:31 AM
To: 'Brad Cumbia'; [email protected]
Subject: RE: Ioc denial of service attacks


Brad,

I don't know of any such vulnerability. Are you experiencing such crashes? If so please arrange for a vxWorks specialist to capture a stack trace,
thread cpu usage, MBUF usage information. With that information I could probably take the necessary steps to avoid trouble in the future.

I am particularly interested in situations where the IOC does not recover
after the sacan is completed.

Thanks,

Jeff

-----Original Message-----
From: Brad Cumbia [mailto:[email protected]] Sent: Monday, February 06, 2006 10:09 AM
To: [email protected]
Subject: Ioc denial of service attacks


Has anyone experienced global ioc crash's due to NMAP or Nessus security scans?
Also how do other labs isolate their ioc network to insure the integrity of the systems? Any help would be appreciated.
--
Brad Cumbia
Accelerator Network Administrator/Senior Controls Technologist Thomas Jefferson National Accelerator Facility Electrical Engineering Support Group Instrumentation & Control Systems Accelerator Computing Environment 12000 Jefferson Avenue Newport News, Virginia 23606 Phone (757)269-5839 Pager (757)584-5839 Fax (757)269-7309
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References:

RE: Ioc denial of service attacks Mark Rivers

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