Re: Origin enables XSS to escalate to XSRF (was: security issue with XMLHttpRequest API compatibility)

On Sun, Jun 7, 2009 at 6:24 PM, Mark S. Miller <erights@google.com> wrote:
> On Sun, Jun 7, 2009 at 4:29 PM, Adam Barth <w3c@adambarth.com> wrote:
>>
>> Right, but once the attacker has XSSed site A, the attacker learns the
>> secret token necessary to issue the next request in the chain to site
>> A regardless of the method.
>
>
> Recall that this is in response to
>
> On Sun, Jun 7, 2009 at 2:53 PM, Mark S. Miller <erights@google.com> wrote:
>>
>> If servers at A don't freely hand out such tokens in response to guessable
>> GET requests,
>
> So, if servers at A don't do this, how does the attacker, having XSSes site
> A, learn the secret token necessary to issue the next request?

The same way the user does: by generating a click event on whatever
DOM element leads to the next page.

Adam