KRACK - WPA2 essentially cracked.

Forums › LAN (ethernet/Wifi/routers/Bluetooth) › KRACK - WPA2 essentially cracked.

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#1885174 17-Oct-2017 15:50

Paul1977: So, the consensus is that patching the AP only plugs a small part of the hole, and no matter what you do with your AP (short of turning it off) the client devices are vulnerable even when connected to a patched AP?

My understanding is a patched AP will not reissue a key but an unpatched client is capable of receiving one, which is what the attacker does - sends a zero (0) key to the client. Whether or not the patched AP would recognise this has occurred and refuse further comms I'm not sure.

hio77

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#1885179 17-Oct-2017 15:56

Paul1977:

So, the consensus is that patching the AP only plugs a small part of the hole, and no matter what you do with your AP (short of turning it off) the client devices are vulnerable even when connected to a patched AP?

EDIT: Which brings me to my next question. If patching the APs does plug all the holes, what is everyone doing with their wireless networks in the interim until clients patches are available (particularly corporate ones)? What about all the older Android devices that may not get patched, or may be weeks?

Remember many corporate wifi solutions will be using different security options than WPA2..

#include <std_disclaimer>

Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.

KrazyKid

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#1885180 17-Oct-2017 15:57

Still not sure on best practice here.

If I use a VPN to my home network when connecting via wifi while away from home does using a VPN mitigate any Krack issues?
At home seems to be a different matter - I've vulnerable if I use wifi as I cannot use a VPN to connect to my home network as I am already on my home network?

Can't see my LG G2 getting an update for this either. Might be time to upgrade soon.

stinger

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#1885184 17-Oct-2017 16:03

KrazyKid:

Still not sure on best practice here.

If I use a VPN to my home network when connecting via wifi while away from home does using a VPN mitigate any Krack issues?

A VPN on your device will not prevent KRAck, but it will mean that the traffic that is intercepted cannot be read for anything useful.

KrazyKid:

At home seems to be a different matter - I've vulnerable if I use wifi as I cannot use a VPN to connect to my home network as I am already on my home network?

Correct, if you don't have a VPN on your device then any unencrypted traffic could possibly be seen.

Paul1977

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#1885200 17-Oct-2017 16:40

stinger:

KrazyKid:

Still not sure on best practice here.

If I use a VPN to my home network when connecting via wifi while away from home does using a VPN mitigate any Krack issues?

A VPN on your device will not prevent KRAck, but it will mean that the traffic that is intercepted cannot be read for anything useful.

KrazyKid:

At home seems to be a different matter - I've vulnerable if I use wifi as I cannot use a VPN to connect to my home network as I am already on my home network?

Correct, if you don't have a VPN on your device then any unencrypted traffic could possibly be seen.

I can still establish a tunnel to my OpenVPN server at home even when I am at home on the internal wifi.

Paul1977

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#1885202 17-Oct-2017 16:41

Can this exploit in an way reveal the PSK of the network?

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tripp

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#1885213 17-Oct-2017 16:58

If you have a data plan that will last then I guess you could just turn wifi off on your phone and just use mobile data (mmm those unlimited at 25gig plans are looking good now).

kyhwana2

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#1885217 17-Oct-2017 17:06

Paul1977:
Can this exploit in an way reveal the PSK of the network?

No.

If you use WPA2-TKIP (or GCMP, though that's fairly new) an attacker can send whatever packets they want into your network, including other devices on the network.

Benjip

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#1885227 17-Oct-2017 17:37

Who else will be demanding a refund of their iPhones, Macs, and iPads, under the CGA?

(I kid, I kid)

MadEngineer

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#1885245 17-Oct-2017 18:26

Mikrotik: Fixed weeks ago (AP has no re-use vulnerabilities, client mode fixed)

Ubiquiti: Oh, it's in beta (client mode fix only)

You're not on Atlantis anymore, Duncan Idaho.

kyhwana2

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#1885246 17-Oct-2017 18:27

Benjip:
Who else will be demanding a refund of their iPhones, Macs, and iPads, under the CGA?

(I kid, I kid)

:trollface:

You mean androids :P

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Tinkerisk

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#1885248 17-Oct-2017 18:34

sbiddle:

I've always regarded WiFi as insecure so I guess none of this surprises me.

Best practice!

Qui nihil scit, omnia credere debet.
Firewalls do NOT stop dragons.
In effect we have everything to hide from someone, and no idea who someone is.

sbiddle

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#1885255 17-Oct-2017 19:05

Paul1977:

Can this exploit in an way reveal the PSK of the network?

kickintheeye

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#1885273 17-Oct-2017 19:58

Vodafone position so far:

"Vodafone NZ is aware of the potential security threat to the WPA2 protocol which is used to encrypt and authenticate traffic on Wi-Fi networks.

Vodafone is working with manufacturers to update their devices to protect against vulnerability.

Vodafone NZ is not aware of any customers being directly affected by the threat, but urges people to keep their devices and security software updated"

Of course, I can't find any useful information about my Technicolor router. The admin interface only shows the current system software. I was unable to check if the current firmware is the latest one. The manufacture official website is useless too.

So, I think is time to run to the hills and live in a remote cabin in the woods. Meanwhile, I'm using an ethernet cable for my laptop and mobile data for everything else.

richms

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#1885274 17-Oct-2017 19:59

Wonder if anyone will make AP's able to detect vulnerable client devices by sending duplicates of the part of the handshake that makes this happen and kick them off the wifi?

Richard rich.ms

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