Entering into PhD program after having dropped out of bachelor's
The odds of a career in academia are long in general, and certainly your situation is going to make the odds even longer.  

That said, people tend to only look at your most recent degree.  It seems pretty likely that if you got into a masters program and did very well there, you'd have a good shot at getting into a solid Ph.D. program.  But you'd actually have to do very well in the masters program (probably "best in several years" level).  Furthermore, even once you get into a solid Ph.D. program the odds are against your getting a job in academia.