I know I am not the first to ask about it, but it's still not clear to me. I mean, on this post we can read that
777 is a bad permission in general and I'll show you why.
Despite how it may look in a Casino or Las Vegas, 777 doesn't mean jackpot for you. Rather, jackpot for anyone who wishes to modify your files. 777 (and its ugly cousin 666) allow Read and Write permissions (and in the case of 777, Execute) to other. You can learn more about how file permissions work, but in short there are three groups of permissions: owner, group, and other. By setting the permission to 6 or 7 (rw- or rwx) for other you give any user the ability to edit and manipulate those files and folders. Typically, as you can imagine, this is bad for security. (...)
But in the example we can see that the other user is still on the same PC. What is the danger over the NET? Can anyone access or modify your data files remotely? (In my case I'm talking about a STATIC website.)