Re: DNS spoofing issue. Thoughts on

[imipak <imipak () gmail com>]

Hi Paul,


> > 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.

http://readlist.com/lists/trapdoor.merit.edu/nanog/7/37358.html


IDS of various flavours (from the straightforward cache-monitoring
script posted yesterday, to Snort or the latest "Enterprise Intrusion
Prevention solution" changes the odds somewhat, but this is what is
meant when people say DNSSEC is the only solution (on the table today,
anyway) to the fundamental problem.


=i

-- 
make way for history
flickering like a long-lost memory

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