Shulou(Shulou.com)06/01 Report--

In this issue, Xiaobian will bring you five security issues that need to be paid attention to in the use of Docker. The article is rich in content and analyzed and described from a professional perspective. After reading this article, I hope you can gain something.

By reading online posts and browsing the news, you may get the impression that Docker is inherently weak and not ready to be introduced directly into production. But the reality is that while we need to pay a lot of attention to container security, when used properly, it can be a far safer and more efficient production system than using virtual machines alone or bare metal.

To safely use Docker solutions, you first need to understand the potential security issues they face and master the main tools and techniques to effectively protect container-based systems.

There are also five questions you need to keep in mind and maintain this caution throughout the process of using Docker to host mission-critical applications.

kernel vulnerability

Unlike virtual machine systems, all containers and their hosts use the same set of shared kernels, so any security vulnerabilities in that kernel have the potential to cause significant impact. If one container system causes the kernel to crash, this in turn causes all containers on the entire host to be destroyed. In virtual machines, the situation is much better: an attacker must go through the virtual machine kernel and hypervisor before he can actually reach the host kernel.

denial of service attack

All containers share the same kernel resources. If one set of containers has exclusive access to certain resources--including memory and other more abstract resources such as user IDs--then other containers on the same host are likely to be starved of resources. This is how denial of service attacks (DoS) work, where legitimate users lose access to some or all of the system.

vessel breakthrough

An attacker who has access to one container should, in principle, not be able to gain access to other containers or hosts. By default, users do not have namespaces, so any process outside the container will have the same permissions on the host as it does inside the container; if you have root privileges inside the container, you will also have root status on the host. This means that you need to be prepared for this potential elevation of privileges attack, which means that users often achieve elevation of privileges through bugs in the application code that require additional permissions, allowing the attacker to gain root or other levels of access and manipulation. Given that container technology is still in its early stages of development, we must take this container breakthrough into account when planning our own safety systems.

Toxic mirror image

So how do we determine whether the image we use is safe, tampered with, or reliable? If an attacker coaxes you into running a specially crafted mirror, your hosts and data are at risk. Similarly, you need to make sure that the image you are running is the latest version and does not contain any software versions with known security vulnerabilities.

Secrets of Violation

When a container initiates access to a database or service, it often requires some secret factor, such as an API key or a username and password. Attackers who have access to these secret factors will naturally reach out to the corresponding service. These problems tend to be more severe in microservices architectures, where containers are frequently suspended and started, and therefore much more at risk than virtual machine systems that typically run longer cycles and less data.

The above is what the five security issues that need to be paid attention to in the use of Docker shared by Xiaobian are. If there are similar doubts, please refer to the above analysis for understanding. If you want to know more about it, please pay attention to the industry information channel.

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