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RE: Blocking ssl vpn connections
From: "David Gillett" <gillettdavid () fhda edu>
Date: Mon, 27 Mar 2006 09:39:09 -0800

  You need an "SSL proxy" (as your firewall) to do this.
Essentially it's a *authorized* "main in the middle", decrypting
and examining the data stream.  At a minimum, it can verify that
this traffic using port 443 really is HTTPS.  Some can also filter
the stream for malware and illicit content as well.

  [Check out Blue Coat -- I think they have a White Paper up about
the things that their boxes can offer.]

David Gillett


-----Original Message-----
From: Andrew Stewart [mailto:astewart () Gestampna com] 
Sent: Thursday, March 23, 2006 1:34 PM
To: security-basics () securityfocus com
Subject: Blocking ssl vpn connections

How would one go about blocking an SSL VPN (e.g. openVPN) on 
a firewall (or even detecting it via an IDS)?  I was 
wondering what a network/security administrator should do to 
prevent an employee from connecting to a SSL VPN from 
internal to the administrator's network to some unknown SSL 
VPN server.  I could see this being used for numerous things 
that are not in agreement with most companies acceptable use policies.

---------------------------
Andrew Stewart
Gestamp Alabama, Inc.
IT Support Tech

astewart () gestampna com

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---------------------------------------------------------------------------
EARN A MASTER OF SCIENCE IN INFORMATION ASSURANCE - ONLINE
The Norwich University program offers unparalleled Infosec management 
education and the case study affords you unmatched consulting experience. 
Tailor your education to your own professional goals with degree 
customizations including Emergency Management, Business Continuity Planning, 
Computer Emergency Response Teams, and Digital Investigations. 

http://www.msia.norwich.edu/secfocus
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