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Docker cgroups Container Escape
Posted on 07 December 2023
This Metasploit exploit module takes advantage of a Docker image which has either the privileged flag, or SYS_ADMIN Linux capability. If the host kernel is vulnerable, its possible to escape the Docker image and achieve root on the host operating system. A vulnerability was found in the Linux kernel's cgroup_release_agent_write in the kernel/cgroup/cgroup-v1.c function. This flaw, under certain circumstances, allows the use of the cgroups v1 release_agent feature to escalate privileges and bypass the namespace isolation unexpectedly.
