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RE: ESX Vmware Physically connected to different segments
From: "Shenk, Jerry A" <jshenk () decommunications com>
Date: Mon, 28 Jan 2008 12:17:51 -0500

You're absolutely right ....it is thought to be secure today...just like
VLANs where before "vlan hopping" became an issue...and as they are now
that the vlan hopping has basically been solved.

-----Original Message-----
From: listbounce () securityfocus com [mailto:listbounce () securityfocus com]
On Behalf Of Jeff Norem
Sent: Monday, January 28, 2008 10:09 AM
To: Albert R. Campa; Kurt Buff
Cc: pen-test () securityfocus com
Subject: Re: ESX Vmware Physically connected to different segments

I have this exact same scenario going on currently.  My SE says that it
is a secure configuration.  I have read all the documents from VMWare
and I agree that if setup correctly, it is secure.  I am still
apprehensive around how an easy to make configuration mistake could open
up a whole between the DMZ and trusted network.  Or perhaps a bug in
VMWare.  Does anyone else have anything they can add to this question?



Jeff Norem, CISSP
Security Analyst/Engineer
HB Fuller Company

V-651-236-4112
C-612-203-0981
F-651-355-9220
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"Kurt Buff" <kurt.buff () gmail com> 1/25/2008 1:41 PM >>>
On Jan 24, 2008 1:41 PM, Albert R. Campa <abcampa () gmail com> wrote:
We have some admins setting up some VMs on an ESX server and they
have
the idea of setting up 1host server with multiple VMs and on some of
these VMs they want physical NICs connected to our main LAN and
other
VMs they want physical wires connected to a DMZ lan.

Normally this would be almost bridging the two networks and bad
practice overall. An explanation from an SA is that virtual switches
are used on the ESX host and this seperates the physical connection
to
our main LAN and this DMZ lan.

This does not sound like good practice but is there documentation to
back that up or in your experience have you been able to exploit
this
type of configuration?

As long as it is set up correctly I think this would be fine.

However, part of "correctly", AFAIAC, is that both subnets are in the
same security domain - that is, if one is trusted, the other must be
as well. I would *never* put, for instance, a guest OS in a DMZ subnet
if the other guests are in a trusted subnet.

Kurt

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