Thank you all for your tips.
I now understand that Dynamic ARP inspection can prevent this technique in
most cases.
However, this is vendor specific, and not every customer uses Cisco. Some
Cisco switches like the 2950 for instance do not offer DAI (or DARP).
What kind of generic measures can be taken if DAI is not an option? Let's
assume that the network is setup properly, with server, admin and user VLANS
setup properly, and that i am doing a pentest, having access to important
DMZ's.
Thanks in advance for your thoughts.
From: Cedric Blancher <blancher@cartel-securite.fr>
To: "P. Entester" <pentest__@hotmail.com>
CC: pen-test@securityfocus.com
Subject: Re: Stopping Arp poison attacks
Date: Sat, 03 Jun 2006 18:00:18 +0200
Le jeudi 01 juin 2006 à 08:14 +0000, P. Entester a écrit :
> If i recommend our customers to bind the MAC addresses of mission
critical
> servers' network interfaces to their respective ports on the routers and
> switches, does that migitate most of the threat or am i missing
something
> important?
No, that does not mitigate the issue. What you're missing is that ARP
cache poisoning does not change host MAC address, but the association
between a MAC address and an IP address in ARP cache.
In addition to pointers that were already given, you can try this one
for ARP cache poisoning understanding:
http://sid.rstack.org/arp-sk/
One other mitigation technic is static ARP cache entries, but it can
become painful to maintain quite fast as network grows.
--
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