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Network communication using unprotected air as a medium leads to unique challenges ensuring confidentiality, integrity and availability. While newer amendments of IEEE 802.11 provide acceptable confidentiality and integrity, availability is still questionable despite broad usage of Wi-Fi technologies for tasks where availability is critical. The authors will present new security weaknesses that they have identified in the 802.11 standard and especially the 802.11h amendment. Their results are underlined by an extensive analysis of attacks addressing the quiet information element and channel switch announcement in management frames. For some stations a complete DoS effect can be achieved with a single packet for more than one minute.
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