full-disclosure - Re: www.google.com xss vulnerability Using mhtml

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Date: Wed, 26 Jan 2011 21:43:28 -0800
From: Michal Zalewski <lcamtuf@...edump.cx>
To: IEhrepus <5up3rh3i@...il.com>
Cc: full-disclosure@...ts.grok.org.uk, Yigit Turgut <y.turgut@...il.com>
Subject: Re: www.google.com xss vulnerability Using mhtml

> 1.www.google.com app don't filter the CRLF

This is not strictly required; there are other scenarios where this
vulnerability is exploitable.

> 2.IE support mhtml protocol handler to render the mhtml file format,
> and this is the why mhtml: is designed

The real problem is that when mhtml: is used to fetch the container
over an underlying protocol, it does not honor Content-Type and
related headers (or even "nosniff").

/mz

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