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Re: [Full-disclosure] noise about full-width encoding bypass?

from [Valdis . Kletnieks] Network Security [Permanent Link]
Subject: Re: [Full-disclosure] noise about full-width encoding bypass?
Date: Mon, 21 May 2007 16:06:06 -0400 
On Mon, 21 May 2007 14:41:58 CDT, Steven Adair said:

I think you could be on either side, but I would learn towards this being
a feature than a bug.  Multiple products appear to do the decoding in the
same manner and intentionally perform this function.


No, they merely *claim* to do it the same way.


                                                      However, the recent
advisories that went out were geared towards IDS/IPS products that were
not designed to be able to recognize such half-/full-width encoded
traffic.


And if the IDS doesn't do it the *exact* same way, we're just repeating
the mistakes of "using fragmented packets to bypass the IDS", "using X to
bypass the IDS", "using Y to bypass the IDS"... and so on.

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