find

# find files without read / write permissions for other
find /media/foo /media/bar ! -perm -o+rw -exec ls -l {} \;
find /media/foo /media/bar -ctime -1 -type f ! -perm -go+rw -exec chmod a+rw {} \;
find /media/foo /media/bar -1 -type d ! -perm -go+rwx -exec chmod 777 {} \;