Actually you are not missing anything. It is a brute force attack. I think you had the right concept when you indicated that "networks and hardware may be fast enough". It is not maybe, it is; and every script kiddie on your block has the power in his/her bedroom. Then you add the college crowd sitting on 10Gig pipes to the Internet and the threat is real. But other than just muck things up where is the motivation for a poisoning? Robert D. Scott Robert@ufl.edu Senior Network Engineer 352-273-0113 Phone CNS - Network Services 352-392-2061 CNS Receptionist University of Florida 352-392-9440 FAX Florida Lambda Rail 352-294-3571 FLR NOC Gainesville, FL 32611 321-663-0421 Cell -----Original Message----- From: Joe Greco [mailto:jgreco@ns.sol.net] Sent: Wednesday, July 23, 2008 6:31 PM To: Robert D. Scott Cc: nanog@merit.edu Subject: Re: Exploit for DNS Cache Poisoning - RELEASED
Now, there is an exploit for it.
Maybe I'm missing it, but this looks like a fairly standard DNS exploit. Keep asking questions and sending fake answers until one gets lucky. It certainly matches closely with my memory of discussions of the weaknesses in the DNS protocol from the '90's, with the primary difference being that now networks and hardware may be fast enough to make the flooding (significantly) more effective. I have to assume that one other standard minor enhancement has been omitted (or at least not explicitly mentioned), and will refrain from mentioning it for now. So, I have to assume that I'm missing some unusual aspect to this attack. I guess I'm getting older, and that's not too shocking. Anybody see it? ... JG -- Joe Greco - sol.net Network Services - Milwaukee, WI - http://www.sol.net "We call it the 'one bite at the apple' rule. Give me one chance [and] then I won't contact you again." - Direct Marketing Ass'n position on e-mail spam(CNN) With 24 million small businesses in the US alone, that's way too many apples.