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Re: Hidden sniffer on unplumb'ed interface on Solaris
From: George Ellenburg <gellenburg () FREEDOM NET>
Date: Fri, 5 Jan 2001 16:47:19 -0500

Hash: SHA1

On Friday 05 January 2001 00:40, you streamed these bits across the ether:
After reading the following article
(http://www.enteract.com/~robt/Docs/Howto/Sun/sniffer-trick.txt) by Rob
Thomas, it was brought to my attention that a sniffer can be silently
sitting on an unplumb'ed interface on Solaris. Not only is this dangerous
for large networks, it is often hard to find. Has anyone ever contacted
Sun about this potential problem...I'm fixing to try this on Solaris 8 to
determine if the problem still exists.


I don't actually consider this to be a problem. This is how some network 
IDSes are able to work (RealSecure for one) and can avoid all risk of IP 
based attacks (since there's no ipaddr on the if).

But, the interfaces are able to found, you just need to look for the MAC 
address and not the IP. ;-) Checking the ARP tables of your switches and 
routers should bring a rogue interface that doesn't have an ipaddr assigned 
to it.


George Ellenburg
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