Chrome OS before 53.0.2785.144 allows remote attackers to execute arbitrary commands at boot.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2016-6130
https://chromereleases.googleblog.com/2016/09/stable-channel-updates-for-chrome-os.html
https://bugs.chromium.org/p/chromium/issues/detail?id=649039