The check_permission_v1 function in base/pkit.py in HP Linux Imaging and Printing (HPLIP) through 3.13.9 does not properly use D-Bus for communication with a polkit authority, which allows local users to bypass intended access restrictions by leveraging a PolkitUnixProcess PolkitSubject race condition via a (1) setuid process or (2) pkexec process.
lists.opensuse.org/opensuse-updates/2013-10/msg00062.html
lists.opensuse.org/opensuse-updates/2013-11/msg00000.html
rhn.redhat.com/errata/RHSA-2013-1274.html
www.debian.org/security/2013/dsa-2829
www.ubuntu.com/usn/USN-1956-1
bugzilla.redhat.com/show_bug.cgi?id=1002375
bugzilla.redhat.com/show_bug.cgi?id=1006674