/usr/share/ is in nuauth-extra 2.4.3-3.4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/
/usr/share/doc/nuauth-extra/
/usr/share/doc/nuauth-extra/auth_mysql.ipv4.mysql.dump
/usr/share/doc/nuauth-extra/auth_mysql.ipv6.mysql.dump
/usr/share/doc/nuauth-extra/authmysql/
/usr/share/doc/nuauth-extra/authmysql/index.php
/usr/share/doc/nuauth-extra/authmysql/pages/
/usr/share/doc/nuauth-extra/authmysql/pages/authentication.php
/usr/share/doc/nuauth-extra/authmysql/pages/authentication_error.php
/usr/share/doc/nuauth-extra/authmysql/pages/authentication_success.php
/usr/share/doc/nuauth-extra/changelog.Debian.gz
/usr/share/doc/nuauth-extra/changelog.gz
/usr/share/doc/nuauth-extra/check_net.mysql
/usr/share/doc/nuauth-extra/copyright