In Docker through 18.06.1-ce-rc2, the API endpoints behind the 'docker cp' command are vulnerable to a symlink-exchange attack with Directory Traversal, giving attackers arbitrary read-write access to the host filesystem with root privileges, because daemon/archive.go does not do archive operations on a frozen filesystem (or from within a chroot).
https://usn.ubuntu.com/4048-1/
https://github.com/moby/moby/pull/39252
https://access.redhat.com/security/cve/cve-2018-15664
https://access.redhat.com/errata/RHSA-2019:1910
http://www.securityfocus.com/bid/108507
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00001.html
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00066.html