AirPort 3.3 Extends WPA Security

tackaberry writes "Apple has released an update for AirPort. Version 3.3 (AEBS firmware version 5.3) includes support for Wi-Fi Protected Access (WPA) specification for non-Extreme AirPort cards (WPA was added for Extreme cards last fall in version 3.2), an alternative to the oft-maligned Wired Equivalent Privacy (WEP). Those who wish to use WPA will have to have Mac OS X Panther 10.3."

Comments

Kernel Panic!

[NetJunkie]

I put this on my 15" PB last night and got my first kernel panic. :)

The WPA is very easy to use. I've been running it for a couple of weeks now using the Apple base. Windows XP and OSX clients aer working happily.

What's wrong with WEP?

[Van Halen]

I'm curious, and I figure somebody here probably knows a good deal about this. The Wi-Fi Protected Access Q&A (pdf) says:

Many cryptographers are confident that Wi-Fi Protected Access addresses all the known attacks on WEP. It also adds strong user authentication, which as absent in WEP.

Ok, user authentication is good, but what are the "known attacks on WEP"? I'm using a Linksys access point which obviously can't be upgraded to WPA with this update, so should I be concerned that my 128-bit WEP key isn't good enough?

Re:What's wrong with WEP?

[Anonymous Coward]

You should be quite concerned. WEP is poorly implemented cryptography, you should see what LinkSys supports to limit access to your Router by MAC address, this won't solve the problem of your data not being 100% unreadable and such when sent over your connection, but at least no one else could hop on your network easily and steal bandwidth.

Re:What's wrong with WEP?

[NetJunkie]

Some implementations of WEP are weaker than others. The main problem is that given enough data from your network I can break your key rather quickly. Usually you are looking at several GBs of data (3 to 5GB usually). While someone wardriving wouldn't bother a neighbor with nothing but time might.

If you have a Mac...and I'm assuming you do...go check out the Kismac tool.

WPA also has some weaknesses...mainly in the WPA-PSK (pre-shared key) implementation that most home users use. You can do a dictionary attack against the key.

Re:What's wrong with WEP?

[amnesiacdotorg]

the keys used in WEP are static, not dynamic . sure, 128-bit RC4 is generally secure, but it would be really secure if the key was rotated by the access point . this is done by WPA . WPA is only a placeholder until WPA2 is released, featuring wireless robust authentication protocol and cipher block chaining message authentication code protocol or CCMP.

Re:What's wrong with WEP?

[kinnell]

You can find a good analysis here.

Re:What's wrong with WEP?

[The Bum]

Have you checked to see if Linksys has a firmware update available that adds WPA support for your access point? My Netgear WGR614 didn't support WPA until a week or so ago, although the firmware that's available is still in beta. BTW, so far it works pretty well with my 12" PowerBook G4 and iBook SE/466.

Re:Still left out in the cold for Cisco

[NetJunkie]

What's the issue? It should work fine. The AirPort Does WPA and WPA-PSK. Are you sure you are using WPA and not LEAP? I do LEAP on our 1100s..and the AirPort works with that too.

WPA PSK Dictionary attack

[nsayer]

Not only is there a WPA PSK dictionary attack, it is actually an OFFline dictionary attack - meaning that the attacker can sniff a valid authentication, then take the sniffed data back home and run the dictionary attack on his own without involving the real gatekeeper (who otherwise would see n invalid attempts in a row and have a chance to raise an alarm).

In general, any scheme where you send a random number to the client, he takes that and adds the secret sauce and sends it back for your comparison is vulnerable to offline dictionary attack.

The good news is that you can pretty easily trash an offline dictionary attempt by making up a really long and obscure passphrase.

Re:WPA PSK Dictionary attack

[Beryllium Sphere(tm)]

I recommend Diceware (http://world.std.com/~reinhold/diceware.html) for generating sorta-memorable passphrases with quantifiable security. A ten-word Diceware passphrase has about 129 bits of entropy.

WPA goodness

[nsayer]

I'm quite happy with WPA-PSK (with the caveat that you need to pick a very strong passphrase to avoid offline dictionary attacks). My wife has an iBook G4 and I have a TiBook with a Linksys WPC54G in it and they all talk to a Linksys WAP54G. It was all miraculously easy.

Then I had to get a couple of Windows laptops to work. That was misery!

First, you must be running XP. I guess that's fair, since Apple says you must be running Panther.

Next, you have to have a wireless card that has drivers updated with WPA support. Irritatingly enough, a WPC54G with the latest drivers will work, but a WPC55G (A+G card) won't because the drivers aren't updated. Grr!

I did finally get it to go, but it was a whole lot easier on the Mac.

I also wanted to set up WPA "Enterprise" with an eye towards deploying that at the office. I still haven't figured out how to get that to work, unfortunately. But the PSK variety was surprisingly easy.

Can't use WPA with WDS

[tackaberry]

If you've set up multiple AirPort Extreme Base Stations as a wireless distribution system (WDS) to extend your network, you have to use WEP for security. WPA cannot be used with WDS.

If you want to use WPA, you'll have to string your base stations together on the lan