full-disclosure - Re: DNS spoofing issue. Thoughts on

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Message-ID: <226B2B6F6A414C41ACC29C03@[192.168.2.101]>
Date: Sat, 26 Jul 2008 17:10:58 -0500
From: Paul Schmehl <pschmehl_lists@...rr.com>
To: Full Disclosure <full-disclosure@...ts.grok.org.uk>
Subject: Re: DNS spoofing issue. Thoughts on

--On Saturday, July 26, 2008 8:34 PM +0100 imipak <imipak@...il.com> wrote:
>
>>> The attack isn't "impossible", it's more like "1% chance *per hour* that
>>> your IDS doesn't notice and stop the attempts".  Big difference...
>>>
>>
>> The information that I have says it's statistically impossible *if*
>> you are patched.
>>
>
> It's not statistically impossible; it just takes 2^16 times longer.
> And as Joe Greco observed on NANOG:
>
>> But realizing that going from 11 seconds to (11 * 64512 =) 8.21 days is
>> not a significant jump from the PoV of an attacker would certainly have
>> factored into my decision-making process.
>

How shall I put this?  If you don't notice a dns cache poisoning attack for 
8.21 days, you *deserve* to have your cache poisoned.  (Not that anyone 
ever deserves to be hacked, but there *is* such a thing as criminal 
negligence.)

Paul Schmehl
As if it wasn't already obvious,
my opinions are my own and not
those of my employer.

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