The good_client function in rquotad (rquota_svc.c) in Linux DiskQuota (aka quota) before 3.17 invokes the hosts_ctl function the first time without a host name, which might allow remote attackers to bypass TCP Wrappers rules in hosts.deny.
https://hermes.opensuse.org/messages/15509723
https://bugzilla.redhat.com/show_bug.cgi?id=566717
http://www.openwall.com/lists/oss-security/2012/07/19/5
http://www.openwall.com/lists/oss-security/2012/07/19/2
http://sourceforge.net/tracker/?func=detail&aid=2743481&group_id=18136&atid=118136
http://rhn.redhat.com/errata/RHSA-2013-0120.html
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705