WebApp Sec mailing list archives

Re: HTML entity bignums


From: "Ulf Harnhammar" <metaur () operamail com>
Date: Thu, 31 Jul 2003 13:36:55 +0100

IMNSVHO there is *no* situation where you may want to allow HTML 
from any untrusted or unknown source. It is always a better option to use
different (simpler!) formats that are then turned to html by the web app.

This works well in web forums, where users can use some simple BBcode or something (although that has security problems 
of its own, if you're not careful). I'm not so sure if it works in situations where you want a more complex language. 
Are users willing to learn a new language with the capabilities and complexity of HTML, just because the developers 
decided that HTML was too insecure? Being able to use the familiar HTML language might be seen as a competitive 
advantage when comparing programs.

// Ulf Harnhammar

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