At Ars Technica, you can read my long explanation of the group key weakness in WPA/WPA2 Enterprise-protected networks: The information I was given was originally under embargo, but the firm and unrelated researchers released essentially all the data except a video of an exploit in action and some of the mitigation information. Hence, the long Ars Technica piece. Boiled down, I don’t think anyone need worry about Hole196, which describes how an insider with an account on a WPA/WPA2 Enterprise network can send group broadcast packets spoofed to appear as if they originate from the access point for clients attached to that access point
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More Detail on Wi-Fi Exploit "Hole196"