postfix/postfix-script: warning: group or other writable

_ [debian] postfix/postfix-script: warning: group or other writable

postfix/postfix-script[XXXX]: warning: group or other writable: /usr/lib/postfix/./libpostfix-util.so.1
postfix/postfix-script[XXXX]: warning: group or other writable: /usr/lib/postfix/./libpostfix-master.so.1
postfix/postfix-script[XXXX]: warning: group or other writable: /usr/lib/postfix/./libpostfix-tls.so.1
postfix/postfix-script[XXXX]: warning: group or other writable: /usr/lib/postfix/./sbin/lmtp
postfix/postfix-script[XXXX]: warning: group or other writable: /usr/lib/postfix/./libpostfix-dns.so.1
postfix/postfix-script[XXXX]: warning: group or other writable: /usr/lib/postfix/./libpostfix-global.so.1
postfix/postfix-script[XXXX]: warning: group or other writable: /usr/lib/postfix/sbin/./lmtp

というのが出るんだけど #832576 らしい。