PolicyKit 0.103 sets the AdminIdentities to “wheel” by default, which allows local users in the wheel group to gain root privileges without authentication.
cgit.freedesktop.org/PolicyKit/commit/?id=763faf434b445c20ae9529100d3ef5290976d0c9
patch-tracker.debian.org/patch/series/view/policykit-1/0.104-2/05_revert-admin-identities-unix-group-wheel.patch
secunia.com/advisories/48817
security.gentoo.org/glsa/glsa-201204-06.xml
www.mail-archive.com/polkit-devel%40lists.freedesktop.org/msg00327.html
www.openwall.com/lists/oss-security/2012/03/28/1
www.openwall.com/lists/oss-security/2012/03/28/2
bugs.gentoo.org/show_bug.cgi?id=401513
launchpad.net/ubuntu/+source/policykit-1/0.103-1