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Houston storm knocked out electricity to nearly 1 million users and left several dead, including a man who tried to power an oxygen tank with his car
r/technology
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“Unprecedented” Google Cloud event wipes out customer account and its backups. UniSuper, a $135 billion pension account, details its cloud compute nightmare.
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63% of surveyed Americans want government legislation to prevent super intelligent AI from ever being achieved
r/Futurology
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Study reveals 77% of the US public approves selecting embryos based on DNA (polygenic scores) for likelihood of developing health conditions and 30% approve it for traits. Nearly all expressed concerns about potential negative outcomes for individuals or society. What do you think?
r/Futurology
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Reddit hawks your posts to our AI overlords again, this time to OpenAI
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Security PSA for anyone using Docker on a publicly accessible host. You may be exposing ports you’re not aware of…
r/selfhosted
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• Security PSA for anyone using Docker on a publicly accessible host. You may be exposing ports you’re not aware of…

I have been using Docker for years now and never knew this until about 20min ago. I have never seen this mentioned anywhere or in any tutorial I have ever followed.

When you spin up a docker container using the host network its port mappings will override your firewall rules and open those ports, even if you already created a rule to block that port. Might not be that big of a deal unless you’re on a publicly accessible system like a VPS!

When you’re setting up a container you need to modify your port bindings for any ports you don’t want accessible over the internet.

Using NGINX Proxy Manager as an example: 

ports:
    - ‘80:80’
    - ‘443:443’
    - ‘81:81’

Using these default port bindings will open all those ports to the internet including the admin UI on port 81. I would assume most of us would rather manage things through a VPN and only have the ports open that we truly need open. Especially considering that port 81 in this case is standard http and not encrypted.

To fix this was surprisingly easy. You need to bind the port to the interface you want. So if you only want local access use 127.0.0.1 but in my example I’m using Tailscale. 

ports:
    - ‘80:80’
    - ‘443:443’
    - ‘100.0.0.1:81:81’

This will still allow access to port 81 for management, but only through my Tailscale interface. So now port 81 is no longer open to the internet, but I can still access it through Tailscale.

Hopefully this is redundant for a lot of people. However I assume if I have gone this long without knowing this then I’m probably not the only one. Hopefully this helps someone.

Update:

There seems to be a decent amount of people in the comments who don't seem to realize this is not really referring to systems behind NAT. This post is mostly referring to those who are directly open to the internet where you are expected to manage your own firewall in the OS. Systems such as VPS's, or maybe someone who put their server directly in a DMZ. Any system where there is no other firewall in front of it.

Google Cloud accidentally deletes account, backups of Australian pension fund managing $135 Billion
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• Google Cloud accidentally deletes account, backups of Australian pension fund managing $135 Billion
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“Unprecedented” Google Cloud event wipes out customer account and its backups
https://arstechnica.com/gadgets/2024/05/google-cloud-accidentally-nukes-customer-account-causes-two-weeks-of-downtime/
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