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    <p><strong>Summary</strong></p> <p>Add <code>crossdomain.xml</code> to each CDN host or adopt to limited <code>Sound</code> functionality.</p> <p><strong>Details</strong></p> <ol> <li><p><a href="http://help.adobe.com/en_US/as3/dev/WS5b3ccc516d4fbf351e63e3d118a9b90204-7e3f.html#WS5b3ccc516d4fbf351e63e3d118a9b90204-7c8f" rel="nofollow">SWF files that are assigned to the local-trusted sandbox can interact with any other SWF files and can load data from anywhere (remote or local).</a></p></li> <li><p><code>Sound</code> can load stuff from other domains <a href="http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/media/Sound.html" rel="nofollow">that don't allow access using cross-domain policy with certain restrictions</a>:</p> <blockquote> <p>Certain operations dealing with sound are restricted. The data in a loaded sound cannot be accessed by a file in a different domain unless you implement a cross-domain policy file. Sound-related APIs that fall under this restriction are Sound.id3, SoundMixer.computeSpectrum(), SoundMixer.bufferTime, and the SoundTransform class.</p> </blockquote></li> <li><p>Flash in general has pretty <a href="http://www.adobe.com/devnet-docs/acrobatetk/tools/AppSec/CrossDomain_PolicyFile_Specification.pdf" rel="nofollow">complex cross-domain policies</a> but in your case the bottom line is that you'll need to have proper <code>crossdmain.xml</code> on each host except the one that serves the SWF:</p> <p>3.1. If your file is served from <code>http://resource.domain.com</code> it's not required to have <code>http://resource.domain.com/crossdomain.xml</code> but it's <a href="http://kachurovskiy.com/2013/flash-security-at-the-end-of-flash-era/" rel="nofollow">really good to have one</a>.</p> <p>3.2. You will need to have proper <code>http://dyn2.domain.com/crossdomain.xml</code> explicitly allowing your SWF to access <code>dyn2.domain.com</code> to be able to use <code>URLLoader</code> and other APIs that provide access to raw loaded data. </p> <p>3.3. There's a reason for these restrictions - cookies (and other ambient user credentials). If Flash would not require proper cross-domains after a redirect, one could access any domain with user cookies attached by simply loading his own redirector first. <a href="http://kachurovskiy.com/2013/flash-security-at-the-end-of-flash-era/" rel="nofollow">This means accessing all user cookie-protected data (e.g. mail.google.com) from any SWF on the internet that's running in your browser.</a></p></li> </ol>
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    1. POCrossdomain policy behaviour on 302 redirects in AS3
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    1. USMaxim Kachurovskiy
    1. USMaxim Kachurovskiy
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    1. POCrossdomain policy behaviour on 302 redirects in AS3
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    1. COThank you, very clear and useful!
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