RE: SSL VPN's from LAN to WAN

["Serge Vondandamo" <serge.vondandamo () orange fr>]

1. Isolate their desktops in a separate vlan and redirect all vpn traffic
originating from their subnet to a honeypot or some kind of monitoring
system so you can try to understand what they are doing.

2. You are not overacting!!! You are simply doing your job.

Cheers,
Serge Vondandamo, CISSP

-----Message d'origine-----
De : listbounce () securityfocus com [mailto:listbounce () securityfocus com] De
la part de fac51
Envoyé : mardi 11 décembre 2007 11:09
À : security-basics () securityfocus com
Objet : SSL VPN's from LAN to WAN

Hi All,

I would like some advice on a situation that is new to me.

I have just discovered that some contractors that are on our corporate LAN
have managed to install (Half Install) VPN Clients that allow them to
connect directly back to their LAN (RDP'ing into their Desktops etc.) The
desktops they are using here are locked down but still allow some VPN
functionality. 

The VPN connects over 443 out of our network then to their Firewall as
concentrator.

Implications that I can think of are;

1. All traffic to and from us is encrypted and therefore we cannot monitor.
2. They can see network drives and could be stealing info. (although they
don't have much access)
3. Any infections at their site could propogate to us (that could happen
anyway I suppose via email)

My first reaction is one of horror but am I over reacting?

If my worst fears are confirmed I will need to block them. To do this I was
thinking of blocking all traffic to and from their firewall however
apparently some access to remote services is required by other staff.

Help!?!?

kind regards,

S


 
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