Potential Chroot Container Escape via Mount

Monitors for the execution of a file system mount followed by a chroot execution. Given enough permissions, a user within a container is capable of mounting the root file system of the host, and leveraging chroot to escape its containarized environment. This behavior pattern is very uncommon and should be investigated.

Rule type: eql

Rule indices:

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

Version: 1

Rule authors:

Rule license: Elastic License v2

sequence by host.id, process.parent.entity_id with maxspan=5m
  [process where host.os.type == "linux" and event.action == "exec" and event.type == "start" and
   process.name == "mount" and process.args : "/dev/sd*" and process.args_count >= 3 and
   process.parent.name in ("bash", "dash", "sh", "tcsh", "csh", "zsh", "ksh", "fish")]
  [process where host.os.type == "linux" and event.action == "exec" and event.type == "start" and
   process.name == "chroot"]