full-disclosure - GMail, Google Groups XSS vulnerability addressed

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Message-ID: <26563eca0604301834u392dacbcw74ca714caec7ad06@mail.gmail.com>
Date: Mon May  1 02:34:41 2006
From: dbounds at gmail.com (Darren Bounds)
Subject: GMail, Google Groups XSS vulnerability addressed

FYI: GMail and Google Groups have both mitigated this vulnerability
with two entirely different techniques:

GMail - HTML attachments are renamed at download; replacing the period
with an underscore. (e.g: file.html would become file_html).

Google Groups - HTML attachments are zipped at download.


--

Thank you,
Darren Bounds


On 4/11/06, Darren Bounds <dbounds@...il.com> wrote:
> 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.
>
>
> --
>
> Thank you,
> Darren Bounds
>