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Re: [WEB SECURITY] countermeasure against attacks through HTML shared files

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@xxxxxxxxxx wrote:
> Hello,
> 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:
> http://www.pomcor.com/whitepapers/file_sharing_security.pdf
> 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
> know.
> Thanks,
> Francisco Corella
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Adrian P. | Senior IT Security Consultant | DDI: +44 (0)207 307 5026 |
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