Can someone outside of the lan uses my nginx proxy?

Charly Roch

10/17/22, 4:32 PM

I know this question can sounds weird but I noticed strange behaviour on our network.

Here's the context:

I have a vm running multiple docker containers. To simplify their use and because I need https we set up a nginx reverse proxy in a container jwilder/nginx-proxy (following this method https://www.singularaspect.com/use-nginx-proxy-and-letsencrypt-companion-to-host-multiple-websites/)

I am seeing some requests sent to multiple ips addresses during the night on an unknown port :

@myserverip  48772 =>     18.97.91.16 9001 
@myserverip  59094 =>  19.170.104.214 9001 
@myserverip  35308 =>  19.189.157.180 9001 
@myserverip  52786 =>   25.13.210.166 9001

For the moment iptables allow everyone to request 80 and 443 and the reverse proxy container is the only container mapped on these port. I filtered all incoming connection and no more connection to these ips.

Can someone from the outside uses the reverse proxy ?

0 + 2

security

nginx

reverse-proxy

docker

Sairam

10/17/22, 5:12 PM

Use a tool like https://developers.google.com/speed/pagespeed/insights/ to validate if your website/domains are accessible from outside. Those look like external connections to port 9001 to external IPs.

Charly Roch

10/18/22, 4:04 PM

What you mean by external connection ? My nginx is accessible to anyone on port 80 and 443 to allow access to the others containers that are on the same host. Nginx uses virtualhost to redirect to the right container.

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EN: Can someone outside of the lan uses my nginx proxy?

TH: Can someone outside of the lan uses my nginx proxy?

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