Never mind, more testing confirmed that it was a local issue. Somehow my /var/lib/docker was trashed. Remove all the directory and restarting from scratch solved the issue. Regards, JC Le 24/01/2018 à 16:06, Jean-Christophe Baptiste a écrit :

Moreover, cat /etc/shadow shows host's users that should not be there (understand: my user)...

Le 24/01/2018 à 16:01, Jean-Christophe Baptiste a écrit :

...

Hi guys,

I am afraid of a security issue with Docker. Sorry but I have no other machines to test for now, so it might be a local issue only.

I realized that today when running an Ubuntu container :

% docker run -ti --rm --hostname=ubuntu --net=host ubuntu /bin/bash

It runs a bash shell inside the Ubuntu container.

But, from within the container (screenshot attached):

% apt update # should fail, not finding the command % zypper refresh # unexpectedly, it would work and refresh the host repos!

Of course, this is absolutely abnormal and I am still evaluating the exact impact.

I can tell that the issue was not here one week ago (I have been a quite intensive Docker user for around 2 years).

So I am not sure what is causing this behavior.

Looking forward to reading some feedbacks.

Best regards,

-- JCB