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 <[EMAIL PROTECTED]> 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
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