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Re: [WEB SECURITY] countermeasure against attacks through HTML shared files
From: "Adrian P." <adrian.pastor () PROCHECKUP com>
Date: Fri, 7 Nov 2008 15:42:43 +0000

Hi Francisco,

It would have been cool to mention Microsoft SharePoint as an example of
a popular file sharing system that allows persistent XSS through shared
HTML files. i.e.:


Where 'evil.html' would be a page containing JavaScript. i.e.:



Thanks for your paper btw.

fcorella () pomcor com wrote:

I wanted to announce a Pomcor white paper that
looks at attacks through HTML shared files in Web
applications and proposes a countermeasure.  These
are essentially XSS attacks, but the usual
defenses against XSS are typically not available,
because shared files cannot be sanitized.

The paper is available at:


I have not been able to find much prior work.
What I've found is discussed in Section 2 of the
paper.  If I've missed something, please let me


Francisco Corella

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