This video walks you through the Boot2Root challenge called SkyDog CTF. This machine can be downloaded from VulnHub. Many thanks to those who put it together, and to VulnHub for hosting.
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SkyDog CTF Download
http://download.vulnhub.com/skydog/SkyDogCTF.ova
ExifTool Download
http://www.sno.phy.queensu.ca/~phil/exiftool/install.html
G0tM1lk Privilege Escalation Blog Post
https://blog.g0tmi1k.com/2011/08/basic-linux-privilege-escalation/
Thanks for watching!
-Jason