Open-iSCSI targetcli-fb through 2.1.52 has weak permissions for /etc/target (and for the backup directory and backup files).
https://security.gentoo.org/glsa/202008-22
https://github.com/open-iscsi/targetcli-fb/pull/172
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00005.html
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00003.html