[1.6.x] Fixed #22504 -- Corrected domain terminology in security guide.
Thanks chris at chrullrich.net.
Backport of f65eb15ac6
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@ -237,11 +237,11 @@ User-uploaded content
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you can take to mitigate these attacks:
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1. One class of attacks can be prevented by always serving user uploaded
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content from a distinct Top Level Domain (TLD). This prevents any
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exploit blocked by `same-origin policy`_ protections such as cross site
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scripting. For example, if your site runs on ``example.com``, you would
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want to serve uploaded content (the :setting:`MEDIA_URL` setting) from
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something like ``usercontent-example.com``. It's *not* sufficient to
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content from a distinct top-level or second-level domain. This prevents
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any exploit blocked by `same-origin policy`_ protections such as cross
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site scripting. For example, if your site runs on ``example.com``, you
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would want to serve uploaded content (the :setting:`MEDIA_URL` setting)
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from something like ``usercontent-example.com``. It's *not* sufficient to
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serve content from a subdomain like ``usercontent.example.com``.
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2. Beyond this, applications may choose to define a whitelist of allowable
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