MySQL Local Privilege Escalation UDF
https://www.youtube.com/watch?v=G52yT0Gv_zc
https://www.youtube.com/watch?v=N0fn2dWlUFI
https://www.youtube.com/watch?v=ZCoQ-28wKyg
https://www.youtube.com/watch?v=SNybBMOg0Vs
https://www.youtube.com/watch?v=g0hKFoN-Hwc
http://securitypentester.ninja/mysql-udf-injection/
http://kooksec.blogspot.co.uk/2015/09/hacking-lord-of-root.html
http://www.blackhat.com/presentations/bh-europe-09/Guimaraes/Blackhat-europe-09-Damele-SQLInjection-slides.pdf
https://www.google.co.uk/search?q=core+lib_mysqludf_sys&oq=core+lib_mysqludf_sys&aqs=chrome..69i57.966j0j7&sourceid=chrome&ie=UTF-8
https://www.offensive-security.com/backtrack/penetration-testing-in-the-real-world/ see minute
https://github.com/mysqludf/lib_mysqludf_sys/
http://itdrafts.blogspot.co.uk/2014/11/mysql-root-to-system-root-with.html