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

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Date: Fri, 7 Nov 2008 15:42:43 +0000
From: "Adrian P." <adrian.pastor@...CHECKUP.com>
To: "fcorella@...cor.com" <fcorella@...cor.com>
Cc: "websecurity@...appsec.org" <websecurity@...appsec.org>,
	"bugtraq@...urityfocus.com" <bugtraq@...urityfocus.com>
Subject: 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.:

https://moss.company.foo/_catalogs/users/Attachments/<userID>/evil.html
https://moss.company.foo/<siteName>/<SectionName>/evil.html

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

<html>
<body>
<script>
alert(document.domain)
</script>

</body>
</html>


Thanks for your paper btw.

fcorella@...cor.com 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 |
PGP Key ID: 0x06E653A6