The vulnerabilities affect Cisco Wireless LAN Controllers, but the company is offering a workaround..
Cisco Systems released a security advisory on Tuesday afternoon to address several vulnerabilities in its Wireless LAN Controllers that could enable hackers to cause a denial-of-service on the affected network.
The flaws lie in the handling of Address Resolution Protocol (ARP) packets. The advisory noted that a unicast ARP request may be flooded on the LAN links between Wireless LAN Controllers in a mobility group.
A vulnerable WLC may mishandle unicast ARP requests from a wireless client, leading to an ARP storm. The bugs affect versions 4.1, 4.0, 3.2, and prior versions of the Wireless LAN Controller software, according to the advisory.
The protocol provides a mapping between a device's IP address and its hardware address on the local network. And the Cisco Wireless LAN Controllers provide real-time communication between lightweight access points and other wireless LAN controllers for centralised system-wide WLAN configuration and management functions, according to Cisco.
As a workaround, Cisco is recommending that operators require all clients to obtain their IP addresses from a DHCP server.
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