full-disclosure - Re: noise about full-width encoding bypass?

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Message-ID: <21693.1179777966@turing-police.cc.vt.edu>
Date: Mon, 21 May 2007 16:06:06 -0400
From: Valdis.Kletnieks@...edu
To: steven@...urityzone.org
Cc: Full-Disclosure <full-disclosure@...ts.grok.org.uk>,
	Web Security <websecurity@...appsec.org>
Subject: Re: noise about full-width encoding bypass?

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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