Yeah Android got raped at blackhat 2015, stagefright, certifgate, etc. Android was a huge topic and there was also a universal privledge kernel execution to root ANY Android up to at least 4.3, didn't mention lollipop. Thankfully lollipop is much more secure, but there's a lot to be desired in moving forward with androids OS and security. I just hope Google and OEMs get their shit together or my next phone is going to be an iPhone