full-disclosure - Re: Bypassing of web filters by using ASCII

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Message-ID: <449A669B.30703@iku-ag.de>
Date: Thu Jun 22 14:25:38 2006
From: k.huwig at iku-ag.de (Kurt Huwig)
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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Kurt Huwig             iKu Systemhaus AG        http://www.iku-ag.de/
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