For the record, I am in no-way criticising the developers or what they did in trying to plug the security hole. The issue is that Python has no concept of (nor do their core development team wish to address) process security when used as an embedded language. Python is a language designed to be "extended" not "embedded". Most features have been designed with that lack of limitation in mind, leading to the variety of "exploits" one can use on Blender.

Given the axiom of using standard Python for the scripting language of Blender, there are no good solutions. If the Python developers can't/won't address the issue - the best Blender developer is not left with viable options - only unviable ones.