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FW: Port scan causing system crashes
From: "Brewis, Mark" <mark.brewis () eds com>
Date: Fri, 13 Jun 2003 15:24:03 +0100

-----Original Message-----
From: Brewis, Mark 
Sent: Thursday, June 12, 2003 5:00 PM
To: 'steve.x.jones () royalmail com'
Subject: RE: Port scan causing system crashes
Importance: High


We can help with the HACMP Cluster issue.  There are actually two problems
with HACMP, not just the BUGTRAQ Vulnerability 3358.  I never got round to
writing up a vuln report for it, but it was reported to IBM and given the
following code - IY23867. A pair of APAR's were produced to implement
patches.  The original fix, if I remember correctly, patched AIX.  There was
an additional issue, which caused a DoS, in the HA clustering component.
Both elements need to be patched to prevent a simple connect scan killing
the cluster.

The issue was identified by IBM as a failure of the HACMP application,
causing it to fail.  This differs from the previous vulnerability, which
caused the snmp daemon to crash the operating system.

I remember that IBM were very good at getting a beta-patch out to us
quickly, and were active in getting the APAR's out. 

"I checked on the status of IY23867. According to the result of my search,
this APAR has already been shipped, although the ship date was not given
(related info suggests the APAR did not ship until sometime after
mid-February of this year [2002]). No fanfare accompanied its release, which
normal. There is an e-mail list that announces recent APARs, but one has to
peruse the announcement thoroughly to see what APAR fixes what problem.

You are welcome to make your announcement; we just ask that you mention
that an APAR has been shipped that fixes the problem."

If you go to:



there are links to the various APAR's etc.

The issue was identified by Mark Brewis and Will Wilkinson.


Mark Brewis

Security Consultant
Information Assurance Group
Wavendon Tower
Milton Keynes
MK17 8LX.

Tel:    +44 (0)1908 28 4234/4013
Fax:    +44 (0)1908 28 4393
E@:     mark.brewis () eds com

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-----Original Message-----
From: steve.x.jones () royalmail com [mailto:steve.x.jones () royalmail com]
Sent: Thursday, June 12, 2003 12:23 PM
To: pen-test () securityfocus com
Subject: Port scan causing system crashes


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

I use Nessus to baseline the security of our systems and have twice had
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,
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
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
rogue FTP, SMTP, HTTP etc, obviously I'll have to take more care now...

Thanks in advance for any help.


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