In other news the newest 801.11n WiFi standard has some seriously broken bits in the standard. They introduced a new packet coalescing and aggregation protocol that leaves the chipsets vulnerable to Packet-in-Packet injection. I.e. You can abuse the protocol to include spoofed low level MAC packets in HTTP frames from any web server and other similar fun. An attacker can leverage this technique to deauthenticate clients, inject malicious beacon frames, perform host and port scans, bypass firewall rules, and conduct Address Resolution Protocol (ARP) spoofing. So, not so good, especially since this is a chipset level issue and the chipsets are just behaving as the ill-conceived standard specifies for Aggregated-MAC Protocol Data Units (A-MPDU) handling. Being hardware/firmware, it's not easily changed.
Paper and PoC at link below.