Block PSIPHON 3

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Block PSIPHON 3

L5 Sessionator

Hi all,

 

Does anybody already try with success to block Psiphon (https://www.psiphon3.com) ?

It's quite easy when psiphon is configured in VPN mode but how can I do that when VPN is not used ?

 

Thanks in advance for sharing.

 

V.

1 ACCEPTED SOLUTION

Accepted Solutions

L5 Sessionator

Hi all,

 

After opening a case, the answer is: Decryption enabled (blocking unsupported cypher-suite) + denying 'psiphon' application in security policy should be enough.

 

Need to be tested.

 

V.

View solution in original post

13 REPLIES 13

Cyber Elite
Cyber Elite

Hello,

If you use some kind of web filtering, this should be able to block it on your network. I just checked the PAN-DB-URL and that url is:

 

URL
psiphon3.com
Category
Computer and Internet Info
 
So if the product, I dont know its workings, uses the same URL, you should be able to block it.

Hi,

 

URL filtering can't be used because after "installing" the psiphon client, you need to initiate connexion.

These connexions are based on SSL then no URL filtering ... 😞

 

V.

 

Hello,

I do not know how the client works so I cannot see the traffic for myself. However you should still be able to see the URL's eventhough the traffic is SSL. Perhaps a submission for application detection is in order?

 

Custom signatures:

https://live.paloaltonetworks.com/t5/Documentation-Articles/Custom-Application-Signatures/ta-p/58625

 

Submit an application:

http://researchcenter.paloaltonetworks.com/submit-an-application/

 

Hope this helps...

Just in case you do use URL filtering:

 

URL: www.psiphon3.com
Previous category: computer-and-internet-info
You suggested: proxy-avoidance-and-anonymizers
New category: proxy-avoidance-and-anonymizers
The new categorization is available starting with URL DB version: 2015.09.22.220

 

Regards,

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