Security Basics: RE: Network Segregation to prevent spread of malware

[David Gillett <gillettdavid () fhda edu>]

  You can't, generally speaking, totally segregate your network without (unacceptably!) crippling legitimate activity.  
What you *CAN* hope to do is force SOME traffic, including most non-routine traffic, to traverse a few "choke points" 
where your IDS gets to examine and log whatever packets you can't automatically discard as inappropriate.
  That can be a big improvement over simply trusting everything that has physically walked into your network to get 
intimate with critical internal systems...

David Gillett
CISSP CCNP


-----Original Message-----
From: Rob [mailto:synja () synfulvisions com] 
Sent: Wednesday, January 23, 2013 05:07
To: Jerry Bell; listbounce () securityfocus com; tomright006 () gmail com
Cc: security-basics () securityfocus com
Subject: Re: Network Segregation to prevent spread of malware

Additionally, the services commonly used for worm propagation (RDP/TS, RPC, etc) are also used heavily for domain 
operations anyway.

For many environments this would be one step forward, two steps back in terms of security.

Rob
Sent on the Sprint(r) Now Network from my BlackBerry(r)

-----Original Message-----
From: Jerry Bell <jerry () riskologist com>
Sender: listbounce () securityfocus com
Date: Wed, 23 Jan 2013 07:07:25
To: tomright006 () gmail com<tomright006 () gmail com>
Cc: security-basics () securityfocus com<security-basics () securityfocus com>
Subject: Re: Network Segregation to prevent spread of malware

Hi Tom,

The answer is 'it depends', but probably no. If you are talking about a classic company network and dividing 
workstations into separate networks to prevent cross contamination, you have to consider the pivot points for most 
malware - email, file shares, etc, which can still allow malware to propagate between networks even if no traffic is 
allowed directly between them. Some kinds of malware, notably worms who propagate directly from one system to another 
via some kind of remotely exploitable vulnerability, would be contained by network segmentation, however those sorts of 
events are becoming increasingly rare (however when they do happen, they tend to be big events). 

Jerry

Sent from my iPhone

On Jan 22, 2013, at 5:33 PM, tomright006 () gmail com wrote:

> Hello All,
>
> I need few tips on Network Segregation to prevent spread of Malware. Can I avoid Malware spreading from one network 
> segment to another just by segregating network with access list or firewalls?
>
>
> Thanks,
>
> Tom
>
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Securing Apache Web Server with thawte Digital Certificate In this guide we examine the importance of Apache-SSL and 
who needs an SSL certificate.  We look at how SSL works, how it benefits your company and how your customers can tell 
if a site is secure. You will find out how to test, purchase, install and use a thawte Digital Certificate on your 
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management of your encryption keys and digital certificates.

http://www.dinclinx.com/Redirect.aspx?36;4175;25;1371;0;5;946;e13b6be442f727d1
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------------------------------------------------------------------------
Securing Apache Web Server with thawte Digital Certificate
In this guide we examine the importance of Apache-SSL and who needs an SSL certificate.  We look at how SSL works, how 
it benefits your company and how your customers can tell if a site is secure. You will find out how to test, purchase, 
install and use a thawte Digital Certificate on your Apache web server. Throughout, best practices for set-up are 
highlighted to help you ensure efficient ongoing management of your encryption keys and digital certificates.

http://www.dinclinx.com/Redirect.aspx?36;4175;25;1371;0;5;946;e13b6be442f727d1
------------------------------------------------------------------------