Re: HACMP and port scans

From: Andrew Leonard (
Date: 09/25/01

Subject: Re: HACMP and port scans
Message-ID: <>
Date: Tue, 25 Sep 2001 11:08:23 -0700 (PDT)
From: Andrew Leonard <>

Quoting "Eoin D. Fleming" <>:

> It appears that IBM's HACMP 4.4 clustering software can be induced to
> fail simply by port scanning clustered machines, has anyone come accross
> this vulnerability and is there a workaround?

I have not seen this particular vulnerability, having never used HACMP.
However, I did see a very similar thing on Compaq's TruCluster product two jobs
ago: If port-scanned from a machine without a PTR record in DNS, the cluster
would develop split-brain syndrome. At management's request, this was kept
quiet (as in, not posted here), and we worked with Compaq to develop a patch.

This was back in 1999, and applied to TruCluster 1.5 (I think...). I never saw
an advisory about this from Compaq, so as far as I know this was quietly rolled
into TruCluster updates.


Andrew Leonard
Geospiza, Inc.
3939 Leary Way NW
Seattle, WA 98107
(206) 633-4403; (206) 633-4415 (fax)