It is not required, you can learn a lot from windows internals books,oracle handbook, you already have some opensource like postgresql/linux to play with and list down what all are the main bugs, try to attack a simmilar database/os using the knowledge you have gained

Part of the problem Microsoft has, is that programmers are not fools. Back in the 80's M$ stole software sure that they had enough lawyers to keep a programmer in court forever. SO- programmers began inserting "back doors" into their code, strings of assy bytes, that if called could call external subroutines you know as viruses.

So, Microsoft has stolen the code along with the back doors, and at this point, has no idea how much it has stolen.