<allow-access-from domain="*" secure="false"/>
 <site-control permitted-cross-domain-policies="master-only"/>

I would like to ask two questions:

  1. Is this crossdomain.xml vulnerable (the file is placed on the root of the host e.g. www.example.com/crossdomain.xml)?

  2. How I can exploit or test similar files?

  • 1
    I'm sure you've seen this because it's from a quick google but sethsec.blogspot.com/2014/03/… looks like the most comprehensive resource for exploiting this type of vulnerability. – Justin Moore Aug 19 '15 at 21:20

This crossdomain.xml policy file revokes all protection that the Same Origin Policy provides.

I use the crossdomain proof of concept tool, which has a simple interface to test SOP bypasses.

  • Thanks. So this particular file is vulnerable right? – Michal Koczwara Aug 19 '15 at 23:17
  • 1
    @Michal Koczwara Without a shadow of a doubt. 100% textbook issue right here, all sources will confirm that the SOP has been intentionally disabled. It really doesn't get clearer than this. – rook Aug 19 '15 at 23:19
  • So basically an attacker can send requests to the target from any random domains here: <allow-access-from domain="*" secure="false"/> but not sure what is this ? <site-control permitted-cross-domain-policies="master-only"/> – Michal Koczwara Aug 19 '15 at 23:28
  • <allow-access-from domain="*" secure="false"/> is allow from all. – Shritam Bhowmick Aug 31 '15 at 3:25

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