RE: Blocking ssl vpn connections

["David Gillett" <gillettdavid () fhda edu>]

  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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