The Cisco marketing material makes it look like this is a good idea and
it can probably be made secure but..no, BUT, one little slip-up and an
attacker has access to your core switch. That slip-up can be either a
management slip-up or a yet unknown firmware vulnerability from Cisco.
From a design standpoint, I'd prefer to have the internal networking
separated from the public network or the DMZ. One of the key tenants of
security is multiple layers of security...that's pretty tough with this
design.
It doesn't matter which definition of DMZ is in use, the classic
military-style definition or the more popular, incorrect service network
definition, this is a weak design.
To answer your question, "Would this be a pentest bonanza...?" Probably
not, if it was set up right. ... but it might be tomorrow.
-----Original Message-----
From: cableguy clueless [mailto:cluelesscableguy@gmail.com]
Sent: Friday, August 11, 2006 4:08 PM
To: pen-test@securityfocus.com
Subject: Clueless firewall configuration ?
Guys, I need to ask a favor, my boss knows nothing of IT
infrastructure, and our "cableguy" (manages the firewall through a
third party contract) proposed to him an architecture as follows :
2 cisco 6509 each with firewall blade in them. These function as core
switches for a 1000 users site with lots of vlans and FW roules
between the vlans (oh and we are a big production site that relies on
these cores to let our ciritical bussiness process machines
communicate to the servers).
He wants to create 2 vlans, 1 for untrusted traffic and 1 vlan for DMZ
machines and assign physical ports to these to connect to the
internet. The DMZ vlan would also have some physical ports. These
ports would not be on the core switch but on the access layer switches
that are fiber attached to the distribution switches that attach to
the cores...
Does anyone care to comment on the security issues a setup as this
would pose? would this be pentest bonanza for you guys? and what would
the hackers make of a dmz vlan living in a big switch together with
other vlans?
I have some ideas myself, but would appreciate your take on this. I
know this is the pentest list but it is you guys who get to poke holes
in these designs...
CCG
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