Two files manage the user configuration – one for the user ID range ( /etc/subuid) and the other for the group ID range ( /etc/subgid).īy default, docker uses the dockremap user and group to make the remapping. Re-mapping includes assigning a range of UIDs that function within the container (namespace) as normal UIDs from 0 to 65536 yet have no privileges on the host. Essentially, the container views the user as the root, while the host does not. This is done by user namespace remapping, re-mapping the user for that specific container to a less-privileged user on the Docker host. Run Mac in a Docker container Run near-native OSX-KVM in Docker X11 Forwarding. Since I don't have an M1 Mac, I decided to rent one. However, if you are running an application that requires executing with the root user, there is a way to minimize the chances of malicious activity. TLDR: Use platform: linux/amd64 in docker-compose.yml and your containers will probably work I was trying to figure out how to get a development environment for a Django project running inside Docker in a M1 Mac. The best way to prevent Docker container privilege escalation is not using privileged containers at all. How to Minimize Docker Container Privilege Escalation? The most common scenario is when a legitimate user abuses the given privilege for malicious activity. A cyberattacker could connect to the host from the container and endanger the established infrastructure and configuration.

It creates opportunities for malicious users to take control of the system.Īllowing a container root access to everything on the system opens a window of opportunity for cyberattacks. Having privileged containers is a security risk for any organization. Possible Breaches Via Privileged Containers An image is essentially built from the instructions for a complete and executable version of an application, which relies on the host OS kernel. Exposing the kernel and the hardware resources of the host to any outside cyberattack is always a potential threat to the system.įor this reason, it is not recommended to use privileged containers in a production environment. A Docker image is a file, comprised of multiple layers, that is used to execute code in a Docker container. Just like Ubuntu discourages using the system as root, so does Docker. Why Running Privileged Containers is Not Secure?

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