wi-fi, by poloballs

wi-fi, by poloballs

A couple of weeks ago, I jotted down a few thoughts on the letter from the NRF to the PCI-SSC about the PCI Standards. My post was a bit rant-ish, but Anton Chuvakin threw down a great review in his blog yesterday.

The only point that I wanted to add a different opinion on is the use of WEP.

I’ve been a proponent for wide open wireless networks in corporations for a few years. I argue that because network compromises are either hit-or-miss with advanced encryption technologies, most hackers default to attacking hosts instead. One of our own testers is known to breach networks that security professionals thought were virtually impenetrable. He didn’t do it by packing a Cray into his car. He just set up a louder, fake access point that caused a laptop to associate with him, then launched an attack against that laptop.

Instead of trying to protect the network, why not assume that wireless networks are the equivalent of a user operating from home, and make that user interface with it in that manner? Sure, you can cut down on the noise by doing some basic filtering of MAC addresses, or even a basic WEP key. But inside that setup, run VPNs with firewalls on the endpoints (BOTH sides) to connect the machine to the network. Treat a user sitting in your office using wireless as a remote user, and treat your wireless network the same way you would the internet.

From a handheld device perspective (like the ones often found in retail), things get complicated. Almost to the point that it is virtually impossible to continue their use without upgrading them to WPA/WPA2. Add to that the key management issue that can arise when faced with a pre-shared key (which most of those devices have).

Fundamentally, weak wireless security will be compromised. ASSUME it is compromised. Then build your controls around that hostile intermediary. You have already done it at least once, just duplicate it here. Where have you done it? Probably at least two places. 1) Remote access as I mentioned above, and 2) your external website. In both cases, you assume the internet is compromised (oh my stars, is it ever!), and build your security around that assumption.

This post originally appeared on BrandenWilliams.com.

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