Ive been trying to lock some security vulnerabilities at my server, and I got to the point of the tmp folders. Both of them will store files that are used by other resources, still, reading a little more I found out that the /tmp could save some data that involves the server itself instead of the /var/tmp.
My question is, What are the implications of securing write access to /tmp and /var/tmp. I already tried securing /var/tmp and until now nothing bad has happened.
Is it safe to block /tmp and deny saving files that could damage my server or could there be a type of spam or something similar that affects my security? What is the vulnerability if I allow access on my server to these folders, say writeable with 777 permissions (like they come by default)