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Date: Sat, 15 Mar 2014 09:46:27 -0700
From: Michal Zalewski <lcamtuf@...edump.cx>
To: M Kirschbaum <pr0ix@...oo.co.uk>
Cc: "full-disclosure@...ts.grok.org.uk" <full-disclosure@...ts.grok.org.uk>
Subject: Re: Fwd: Google vulnerabilities with PoC

> As a professional penetration tester, [...]
> The JSON service responds to GET requests , and there is a good chance that
> the service is also vulnerable to JSON Hijacking attacks.

That's... not how XSSI works.

To have a script inclusion vulnerability, you need to have a vanilla
GET response that contains some user-specific secrets that are
returned to the caller based on HTTP cookies (or, less likely, other
"ambient" credentials). For example, a script response that discloses
the contents of your mailbox or the list of private contacts would be
of concern.

Further, the response must be in a format that can be not only loaded,
but also inspected by another site opened in your browser; most types
of JSONP fall into this category, but JSON generally does not,
essentially because of how the meaning of "{" is overloaded in JS
depending on where it appears in a block of code.

Last but not least, the final piece of the puzzle is that the response
must be served at a URL that can be guessed by third parties who don't
have access to your account.

/mz

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