Debian has no firewall rules by default. Up until recently also home directory permissions that were not good for multi user systems. Both by design.

Defaults are often insecure but maximise interoperability or general usability. Look at Windows !

Yes, Debian - and Ubuntu, for that matter - have some pretty bad defaults in some places. Having users' homedirs UGO rwxr-xr-x is pretty bad.

The defaults should be secure with explicit unlock steps for those that know their environment well enough that they can explicitly relax some restrictions.

Well, Docker CE comes with a huge Disclaimer of Warranty (https://github.com/docker/docker-ce/blob/master/LICENSE). I don't think we can complain. "I should have tested it before deploying to production" it's the right thing to say.

I understand your point but how do you explain the complete absence of database security controls? That part is on Newsblur. Defense in depth is important!

Yes, they absolutely have some culpability, but making a change like this without alerting the administrator of the system is the rough equivalent of any process with 'root' privileges on any one of your servers suddenly executing an iptables command to allow all access. You'd only know about it because you got hacked.

Such drastic changes to the security model should only be one after explicit instruction.

The number of companies that operate without access controls between servers on the same segment is unfortunately quite large, database security controls are - again - more often than not left at their default setting and those too are quite often insecure.

Defense in depth always has limited depth, though I totally agree that running a database without access controls is not the way to go.

Docker is a minor part of the issue.

The main problem is lack of basic security.