how to decrypt TLS v1.2 Diffie-Hellman

asked 2020-02-01 11:28:48 +0000

Egis
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Hi, I have IOT device running on openwrt and would like to sniff traffic between IOT device application which runs and sends traffic to Cloud. Application itself uses SSL certificates as I can see in /SSL folder there is 3 certificates like Cacert.pem, newcert.pem, newkey.pem I can see that application is using websocket: Sec-WebSocket-Key: ZSKgM............ WebSocket-Protocol: ldc Sec-WebSocket-Version: 13

Its possible to make decryption of traffic going towards cloud ?

answered 2020-02-01 14:09:02 +0000

grahamb

flag of United Kingdom of Great Britain and Northern Ireland

23790 ●4 ●950 ●227 https://www.wireshark.org

If the device is using a DH key exchange then perfect forward secrecy will prevent decryption even with the private key.

You might be able to perform a MITM either by forcing an algorithm down-grade or by getting the root certificate of the MITM device accepted by the IoT device as a trusted root as is done by many "TSL inspecting" security appliances.

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Problem that IOT device application uses own certificates with CA cert and if I replace with MITM root it cant access Cloud services -- error 403

Egis ( 2020-02-03 05:10:27 +0000 )edit

Yes, as I said to do an MITM you need to get the IoT device to trust the MITM CA cert.

grahamb ( 2020-02-03 13:24:08 +0000 )edit

I can change only by renaming MITM CA cert on IOT device as runing APP is using them. But it wont work as application has CA cert, cert.pm and certkey.pem......

Egis ( 2020-02-03 13:34:32 +0000 )edit

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