Same Origin Policy (SOP) dictates cross domain calls and
allows establishment of cross domain connections. SOP bypasses allow CSRF
attack vector, an attacker can inject a payload on cross domain page that
initiate a request without consent or knowledge of the target user. HTML 5 is
having one more policy in place called CORS (Cross Origin Resource Sharing).
CORS is a “response blind” technique and controlled by extra added HTTP header
“orgin” and their variants but it allows request to hit the target in one way
direction. Hence, it is possible to do one-way CSRF. It is possible to initiate
CSRF vector using XHR-Level 2 on HTML 5 pages and can prove really lethal
attack vector. XHR establishes a stealth connection and remains much hidden,
XHR connection can be set using “withCredentials” as true along with POST
method. It allows cookie to replay and helps in crafting successful CSRF
scenario or session riding. Interestingly HTML 5 along with CORS allows
performing file upload CSRF as well. It is possible to craft a JavaScript using
XHR and inject JSON payload as cross domain. If server side code on JSON
library is not validating the “Content-Type” then it will process the request
and allows successful CSRF.
For example,
Here is a script which will do CSRF on cross domain.
Here, we have “Content-Type” as “text-plain” and no new extra header added so CORS will not initiate OPTIONS
to check rules on the server side and directly make POST request. At the same time we have kept credential to “true”
so cookie will replay.
On the wire we can see following
request.
As you can see cookie is
replayed and JSON POST has been initiated. We get following response back from
application.
Application processed
the request and sent JSON back. It is clear case of CSRF. This can be applied
to other streams as well.
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