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I'm not advocating for running containers as root, I was correcting your suggestion that container breakouts are trivial and easy to perform. But let's walk through those 2022 breakout vulns shall we? I even found one more.
CVE-2022-0847 - DirtyPipe, a Linux kernel vulnerability, and one of the most major and prolific Linux kernel vulns to date. In addition, it wouldn't have mattered if the container ran as root or not, this was a significant Linux kernel flaw. In fact, the PoC runs the container as an unprivileged user.
CVE-2022-0492 - Needed
CAP_SYS_ADMINto be exploitable, isn't exploitable anymore, and falls under my remark of "the user doing something stupid."CVE-2022-0492 - Vulnerability due to cgroups, and wouldn't be exploitable as a root container user unless a very specific set of 5 prerequisites were met. "Just being root" was not enough for exploitation.
CVE-2022-23648 - Was a read-only vulnerability relating to volume mounts, root vs non-root was not relevant to the vulnerability, and it only allowed for "breakout" in situations where you're running in a Kubernetes cluster and the container can read service account tokens. Running as a non root user would not have prevented this.
I'm not saying "running as root doesn't matter," running as a non root user is a best practice, yes. But breakout vulns are more rare and harder to exploit than even your response to me is trying suggest.
Touche.