Hi,
I cannot find any detailed informations about this problem. I’m currently using Ubuntu 14.04 image from your repository and how can I get sure that I’m currently using up to date system, applications in system and libraries that are currently patch for all vulnerable? Also is there any mechanism that will rebuild my docker image when such an vulnerable will be found and patched.
Aptible’s docker images are open source– you can find the ubuntu ones at https://github.com/aptible/docker-ubuntu and inspect them yourself. It looks like, from the dockerfile, they just build off the base ubuntu:14.04 docker image from https://hub.docker.com/_/ubuntu/. That’s an official docker-blessed ubuntu image, so presumably it’s kept up to date.
It seems like aptible rebuilds your docker image each time you deploy, so you should receive any security updates from aptible or the official ubuntu docker image every time you do that.