sym links and permissions
 

lrwxrwxrwx 1 root other 10 Aug 15 12:32 current -> foobar//

since this symlink has world write permissions is it possible to change what file it points to as a non root user? And user not in group other?

Depends on the permissions of foobar. Symlinks don't really have permissions in and of themselves; the permissions of the file/directory being linked to govern access.

Thanks for the answer.