RE: ESX Vmware Physically connected to different segments

["Shenk, Jerry A" <jshenk () decommunications com>]

I believe a couple of the Intelliguardinas did a "demonstration" of this
at SANS in Washington last July.  I put "demonstration" in quotes 'cuz
they didn't ACTUALLY give the full details of how it worked but it sure
seemed like they hopped from one VM to the host.  Now to put things in
perspective a bit, it sounds like they were working on a large
government research contract to determine the vulnerabilities and they
were putting a LOT of time and effort into it.  So, you may not have
adversaries like Ed Skoudis, Tom Liston and their compatriots but, it
seems like this is an issue where you have a valid reason to have some
concern...but, it certainly isn't a common problem today...but,
depending on the value of your data, throwing a separate server in there
might be a better idea.

-----Original Message-----
From: listbounce () securityfocus com [mailto:listbounce () securityfocus com]
On Behalf Of Albert R. Campa
Sent: Thursday, January 24, 2008 4:41 PM
To: pen-test () securityfocus com
Subject: ESX Vmware Physically connected to different segments

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?

Saludos

Albert

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