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Comment by evgen | Hacker News Reader

WPA2 is toast.

Ref to the CVEs that will make a lot of network admins hate Monday: https://twitter.com/nick_lowe/status/919527451570638848

And some background: https://eprint.iacr.org/2016/475.pdf

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Also worth nothing that the attack in the OP is on TKIP, but the KRACK attack that will be revealed tomorrow is based upon problems with the RNG (the example RNG, which apparently everyone used, is trivial to break and the protocol is also kind enough to provide you with a huge chunk of the entropy used in seeding the RNG. D'oh!)

This comment should be made the top comment. Thanks for the information.

I guess this implies not "only" passive eavesdropping but also network access in environments without a MAC address filter (not that these can't be spoofed regardless)?

Spoofed yes but they're hard to guess in advance without prior knowledge of the device's MAC address.

MAC addresses are broadcast in the clear regularly, so any device doing that without some randomization is ripe for the picking.

Worth noting also: You vannot randomize it when connected to a Wi-Fi network.

WPA2 in general, or just WPA2-TKIP?

WPA2 in general. The 4-way handshake is vulnerable. Might be patchable, but there is a ton of embedded stuff out there that will never get updated...

I guess the question is whether only the AP needs to be patched or the client as well.

In fact it is only clients that need patching. However, sometimes AP's are also clients. Disable any such features if you have them and are not depending on them.

It has already been patched by some vendors, but you're right, if the IoT has given us anything, it's tonnes of unpatchable consumer gear.

> WPA2 is toast. No it is not. It is "just" one part of the 4 way handshake.

Source: https://www.krackattacks.com/

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