The default configuration of system.conf in D-Bus (aka DBus) before 1.2.6 omits the send_type attribute in certain rules, which allows local users to bypass intended access restrictions by (1) sending messages, related to send_requested_reply; and possibly (2) receiving messages, related to receive_requested_reply.
https://www.redhat.com/archives/fedora-package-announce/2008-December/msg00436.html
https://exchange.xforce.ibmcloud.com/vulnerabilities/47138
https://bugzilla.redhat.com/show_bug.cgi?id=474895
https://bugs.freedesktop.org/show_bug.cgi?id=18229
http://www.vupen.com/english/advisories/2008/3355
http://www.securityfocus.com/bid/32674
http://secunia.com/advisories/34642
http://secunia.com/advisories/34360
http://secunia.com/advisories/33055
http://secunia.com/advisories/33047
http://lists.opensuse.org/opensuse-updates/2012-10/msg00094.html
http://lists.opensuse.org/opensuse-security-announce/2009-04/msg00010.html
http://lists.opensuse.org/opensuse-security-announce/2009-04/msg00003.html
http://lists.opensuse.org/opensuse-security-announce/2009-03/msg00003.html
http://lists.freedesktop.org/archives/dbus/2008-December/010702.html