GMail, Google Groups XSS Vulnerability
April 11, 2006

GMail and Google Groups are vulnerable to an cross site scripting
(XSS) attack due to their reliance on Content-Disposition to provide
separation between the HTML file download and application scopes. The
result is the ability for an attacker to send / post a malicious HTML
file attachments which,  when read using Internet Explorer, will
execute within the scope of the Google application allowing the theft
of sensitive user content.

A PoC is available on Google Groups at the following URL:

http://groups.google.com/group/Content-Disposition/browse_thread/thread/925106682eb32b2b

This vulnerability is directly related to my posting earlier this week
entitled "Microsoft Internet Explorer Content-Disposition HTML File
Handling Flaw" which can be found at the following URL:

http://lists.grok.org.uk/pipermail/full-disclosure/2006-April/044991.html

Google has been notified.


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Thank you,
Darren Bounds