bugtraq - Re: Bypassing of web filters by using ASCII

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Date: Thu, 22 Jun 2006 11:44:59 +0200
From: Kurt Huwig <k.huwig@...-ag.de>
To: imipak <imipak@...il.com>
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com
Subject: Re: Bypassing of web filters by using ASCII

imipak schrieb:
> Hmmm, I just noticed Firefox's Accept-Charset header doesn't include
> ASCII. Does the HTTP spec say that ASCII is the default charset?

No, it's ISO-8859-1. According to

http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-035.pdf

Page 27 (37):

"11.2 Transformation from 7-bit to 8-bit codes

Within a CC-data-element any 7-bit combination has an equivalent 8-bit
form comprising b7 to b1 of the 7-bit form, together with a b8 of ZERO."


the MSB must be set to 0. The folks at Mozilla say it is evangelism for
some broken AOL pages, but then I ask why evangelism, when it does not
work with IE?
-- 
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