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Re: Question re: load balancers as a security device
From: David Glosser <david_glosser () yahoo com>
Date: Tue, 22 Jan 2008 12:31:44 -0800 (PST)

-Sounds like employees at the ISP have access to those servers, and by extension, could get into your network. 
-Many ISPs have "service" networks for backups and management - what if a server on the same backup segment has a virus 
and infects your machine and then jumps into your corporate address space? 

-Unless the load balancers are doing some sort of filtering, it seems that the machines are being touched -- The load 
balancers  basically deciding WHICH machine  will be accessed, and pass everything, such as through the injection 
attempts,  to the web server behind it.... 





----- Original Message ----
From: "dan.tesch () comcast net" <dan.tesch () comcast net>
To: pen-test () securityfocus com
Sent: Tuesday, January 22, 2008 10:05:28 AM
Subject: Question re: load balancers as a security device

I'm new to a company that has a large number of sites parked on
managed

 servers at a hosting facility - the servers, firewalls and
load

 balancers are exclusive to our use but managed by the ISP.

In reviewing our site design I have seen that the VPN between our
LAN

 and the hosting facility permits all IP traffic in both directions
-

 effectively making these public facing servers part of our LAN in
my

 opinion.

For obvious reasons I'm looking to change this.  Nobody is
lobbying

 against the change but a senior developer that was involved in
the

 original design points out that because of the load balancers in front of
the

 servers, the world at large is not able to touch the machines and
thus

 the potential for compromise is limited.

Could I get some comments from this community about how vulnerable
or

 not this type of setup might be? I'm looking for specific info
related

 to the load balancers not commentary about the corporate LAN in
this

 situation - even if the combination of the firewalls and load
balancers

 provide 99.9% protection I think it is a bad idea and would most
likely

 not pass PCI scrutiny.

Thanks

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