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AJAX May Be Considered Harmful 308

87C751 writes "Security lists are abuzz about a presentation from the 23C3 conference, which details a fundamental design flaw in Javascript. The technique, called Prototype Hijacking, allows an attacker to redefine any feature of Javascript. The paper is called 'Subverting AJAX' (pdf), and outlines a possible Web Worm that lives in the very fabric of Web 2.0 and could kill the Web as we know it."

Be careful when a loop exits to the same place from side and bottom.