16h ago

Firefox Blocks 0.0.0.0 IP Addresses: Tell Us What This Means To You!

connect.mozilla.org Firefox Blocks 0.0.0.0 IP Addresses: Tell Us What This Means To You!

In response to 0.0.0.0 day, Firefox Nightly version 131 had introduced a new security measure: blocking access to 0.0.0.0/::/::ffff:0.0.0.0 addresses. This change is currently live for Nightly users and will be gradually rolled out to all release users in the near future. Before we implement this ch...

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33 comments

I didn't even realize 0.0.0.0 was a valid address to enter into a browser! TIL.
- On Linux it is just a catch all address (listen on all interfaces)
  Elsewhere it doesn't do anything since I don't believe it is part of the networking standards
  
  Yeah I'm familiar with that part, I just meant in context of a browser being able to connect to it.
  
  If I were implementing it, I'd just list all interfaces on the machine and see if there's a service bound to it on the given port. There's probably only one, but it's technically undefined behavior I think.

33 comments