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Re: Thanks for the feedback and NAT-hide question
From: Tim <tim-pentest () sentinelchicken org>
Date: Thu, 10 Aug 2006 19:53:19 -0400

Hi Erin,

You are performing an external pen-test on a weblogic webserver cluster. The
route to the host from the outside is Firewall->IPS->DMZ router->load
balancer->webservers. The router is doing a NAT-hide translation to an
internal subnet that the load balancers sit on with a VIP for the
webservers. How do you get around those obstacles in order to get valid
responses/results and possible find an exploitable hole in Weblogic?

For this scenario I'll let's assume the IP's are:

FW: 256.12.1.11 (yes I know it's not valid)
IPS: none (inline, possible management interface on 10.1.1.0/24)
DMZ router: 256.12.1.15 (ACL for allow 80/443. 256.12.1.15 public IP nats to
various internal IP's. 80/443 traffic routed to LB VIP)
LB: 10.2.1.12 VIP
Webservers: 10.2.2.0/24


I don't know much about Weblogic, and I'm not especially experienced
with HA, but I'll throw in my first thoughts on it.

One mistake in the network design appears to be the placement of the
IPS.  Wouldn't we normally want that positioned between the load
balancers and the webserver?  Presumably the load balancers could
terminate SSL connections and allow the IPS a full view of upper-layer
attacks.  So, attacking the web application over SSL is my first choice.

However, if you're still wanting to hit the lower layers, then I would
try find a way to differentiate between requests that are blocked at the
firewall, and ones that are blocked by the IPS.  This would then allow
me to probe the policy on the firewall alone, possibly using idle scans
to conduct spoofed scans from more trusted 3rd party servers.

Oh, finally, if the load balancers operate more as reverse HTTP proxies
than lower-layer TCP/SSL accelerators, then I'd look into HTTP request
smuggling as well.

cheers,
tim

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