Docker cgroups Container Escape

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.

container container escape docker docker image escape exploit flag flaw found function host image kernel linux linux kernel metasploit operating system privileged root system vulnerability vulnerable