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Fix broken external link in security guide.

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Mike Gunderloy 2017-05-21 08:56:24 -05:00
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guides/source/security.md
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@ -796,7 +796,7 @@ In December 2006, 34,000 actual user names and passwords were stolen in a [MySpa
INFO: _CSS Injection is actually JavaScript injection, because some browsers (IE, some versions of Safari and others) allow JavaScript in CSS. Think twice about allowing custom CSS in your web application._
CSS Injection is explained best by the well-known [MySpace Samy worm](http://namb.la/popular/tech.html). This worm automatically sent a friend request to Samy (the attacker) simply by visiting his profile. Within several hours he had over 1 million friend requests, which created so much traffic that MySpace went offline. The following is a technical explanation of that worm.
CSS Injection is explained best by the well-known [MySpace Samy worm](https://samy.pl/popular/tech.html). This worm automatically sent a friend request to Samy (the attacker) simply by visiting his profile. Within several hours he had over 1 million friend requests, which created so much traffic that MySpace went offline. The following is a technical explanation of that worm.
MySpace blocked many tags, but allowed CSS. So the worm's author put JavaScript into CSS like this: