Protocol break between nxhtd & nxwebplayer (CGI) ?

[Steve92]

Hello,

Quite hard question asked by our CISO…

Is there actually a protocol break between nxhtd & nxwebplayer ?

Sever Direct Connections with a Protocol Break – TDi https://www.tditechnologies.com/2022/02/22/sever-direct-connections-with-a-protocol-break/

“A protocol break severs the direct connection of the user to your endpoints. It works by acting as a man in the middle between the user and the endpoint. Here an IP session terminates completely at the intermediate system and the data from that session is then transferred to a completely different IP session, usually using a different protocol.”

Secure Delivery of a Payload via a Protocol Break https://www.nexor.com/blog/secure-delivery-of-a-payload-via-a-protocol-break

“Rather than allowing a protocol exchange directly between System A and System B, we insert a “Catcher”, often referred to as a proxy (C in the diagram).

To System A, the Catcher looks like it is System B. So System A communicates with the Catcher quite happily.

The Catcher extracts the payload, and passes the payload to another system – the Thrower (T in the diagram).

The Thrower then talks to System B.

As far as System B is concerned it is getting information from System A.”

Does you CGI architecture guarantee such a protocol break ?

How ?

Thanks !

Regards,

Steve.

[Britgirl]

Are you referring perhaps to a protocol break by separating the web server host from the NoMachine server host? If so, yes this is already possible:

How to configure a NoMachine server to connect web sessions on localhost or on different hosts
https://www.nomachine.comAR06P00984

[Steve92]

Hello,

“separating the web server host from the NoMachine server host ”

is a good thing but it is not enough for (very) sensitive environments.

“Protocol break” is a network protocol attack protection as described on this NCSC page :

Network protocol attack protection – NCSC.GOV.UK
https://www.ncsc.gov.uk/collection/cross-domain-solutions/using-the-principles/network-protocol-attack-protection

In our case the risk occurs if a user, from a low security domain, has a remote access to a server in a high level security domain.

We must have strong protection against an attacker who might use the components within NoMachine as a route to compromise the core network.

NCSC :”A protocol break will terminate one transmission path, extract the relevant information, and use this to initiate a new transmission path.”

So the question is : what happens in the black box “nxhtd & nxwebplayer” between the 2 components ?

Is there a network session break ?
Is there a “rewriting” of data or just an “as-is” forwarding ?

Please, could you forward these hard questions to a cybersecurity expert in your teams in labs ?

Thanks,

Regards,

Steve.

[Author]

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