I just received a security alert from my hosting service. It says the 'internal_data' and 'data' directories had insecure permissions (777), which have been remediated. When I logged into my FTP account and checked the folders, I found they had been reset to 755. The XF installation guide says both of those directories must be set at 0777. I just talked to a support rep for my hosting service who told me 777 is generally not safe, and that I will likely receive additional security alerts if I keep those permissions. What should I do?