[Full-disclosure] Cisco Security Advisory: Wireless ARP Storm Vulnerabilities - aka iPhoneDoS

[coderman]

On 7/24/07, Cisco Systems Product Security Incident Response Team
<psirt at cisco.com> exposed their shame as such:
> ...
> Cisco Wireless LAN Controllers (WLC) contain multiple vulnerabilities
> in the handling of Address Resolution Protocol (ARP) packets that could
> result in a denial of service (DoS) in certain environments.

hey, that's a feature!  just sit back and let aircrack-ptw go to town! uNF!


> The WLC contains vulnerabilities in the processing of unicast ARP
> traffic where a unicast ARP request may be flooded on the LAN links
> between Wireless LAN Controllers in a mobility group.

unicast == broadcast?  that's some funny shit, cisco.  how long you
been doing this networking stuff?

(ok, centralized MAC's for wifi are not old hat, but still...)


> A vulnerable WLC may mishandle unicast ARP requests from a wireless
> client leading to an ARP storm. In order for the vulnerability to be
> exposed, two WLCs attached to the same set of Layer-2 VLANs must each
> have a context for the wireless client. This can occur after a Layer-3
> (cross-subnet) roam or when guest WLAN (auto-anchor) is in use.

this is almost as much fun as associating to an AP with its own MAC,
then doing a DHCP.  (when it works, it's hilarious!)


> ...
> This vulnerability is documented as CSCsj69233.
> ... This vulnerability is documented
> as CSCsj50374 ... This
> vulnerability is documented as CSCsj70841.
> ... This behavior has been corrected as part of CSCsj70841.

a few stones uncovered eh..

thanks for the lolz