Distributed to all directories on the server 777 (accidentally) - how to fix it?

Question

Command line

In general, I decided to give the folder 777 permissions via ssh, entered chmod -R 777 /, and then it started
. Hundreds of fat company sites lay down, how to fix it?
I'm already on the edge

Answer 1

...divided into those who do not make backups and those who already do..
don't be nervous if the company does not have a system administrator, those "hundreds of sites" are not so important, if they exist at all

Answer 2

Because the main question has already been answered, I would like (for the future) to draw your attention to one simple truth:
forget about setting the rights "777" to anything in any case.

Answer 3

Backup?