firewalld.py in firewalld before 0.4.3.3 allows local users to bypass authentication and modify firewall configurations via the (1) addPassthrough, (2) removePassthrough, (3) addEntry, (4) removeEntry, or (5) setEntries D-Bus API method.
https://security.gentoo.org/glsa/201701-70
https://bugzilla.redhat.com/show_bug.cgi?id=1360135
http://www.securityfocus.com/bid/92481
http://www.openwall.com/lists/oss-security/2016/08/16/3