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New Member

WPA with AES, is it vulnerable?

On the 4402 model wireless LAN controller, under the WLANs -> Security -> Layer2, it is possible to select WPA Policy and WPA Encrytion "AES".

Does anyone know if this combination is vulnerable to the recent TKIP exploit?

I have WPA Encryption "TKIP" explicitly unchecked, but I thought I read somewhere that TKIP might still be used for backward compatibility. Or that WPA1 with AES might not have been implemented in according to the final WPA2 definition.

4 REPLIES
Green

Re: WPA with AES, is it vulnerable?

WPA with AES is still very strong, and not subject to the vulnerabilities of TKIP.

Good Luck

Scott

New Member

Re: WPA with AES, is it vulnerable?

Hi Scott,

Thanks for your reply.

I just re-read this from the original Cisco Security Response where it says:

"TKIP is the mandatory cipher suite for the first version of the Wi-Fi Protected Access (WPA) specification and it is an option for the Wi-Fi Protected Access version 2 (WPA2) standard.".

Even though we are using WPA(1) where the specification says it is mandatory to include TKIP in the "cipher suite", we are implementing AES and have explicitly disabled TKIP.

I interpret this to mean that we are not vulnerable.

Regards,

Cameron.

Hall of Fame Super Silver

Re: WPA with AES, is it vulnerable?

WPA/Tkip PSK has been compromised as you know, but setting WPA/AES PSK has not been CRACKED....

The only thing is that some devices do not let you setup wpa/aes. I have seen devices that allow you to only either set wpa or the aes. When wpa is the only option, then tkip is automatically set. When TKIP/AES is the only option and you choose AES, then WPA2 is default.

-Scott
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New Member

Re: WPA with AES, is it vulnerable?

Even though TKIP is vulnerable, the atttacks are dictionary-based. If you use a 63-character random string it is still highly unlikely that your TKIP network will be cracked. It's more likely that someone will steal the key via physical means...

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