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Containers are becoming increasingly popular. They have many advantages over virtual machines: they boot faster, have less performance overhead, and use less resources. However, those advantages also stem from the fact that containers share the kernel of their host, instead of abstracting an new independent environment. This sharing has significant security implications, as kernel exploits can now lead to host-wide escalations.
In this presentation, we will:
- Review the actual security risks, in particular for multi-tenant environments running arbitrary applications and code
- Discuss how to mitigate those risks
- Focus on containers as implemented by Docker and the libcontainer project, but the discussion also stands for plain containers as implemented by LXC
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