CUPS 1.4.4, when running in certain Linux distributions such as Debian GNU/Linux, stores the web interface administrator key in /var/run/cups/certs/0 using certain permissions, which allows local users in the lpadmin group to read or write arbitrary files as root by leveraging the web interface.
https://exchange.xforce.ibmcloud.com/vulnerabilities/80012
http://www.ubuntu.com/usn/USN-1654-1
http://www.securityfocus.com/bid/56494
http://www.openwall.com/lists/oss-security/2012/11/11/5
http://www.openwall.com/lists/oss-security/2012/11/11/2
http://www.openwall.com/lists/oss-security/2012/11/10/5
http://support.apple.com/kb/HT5784
http://rhn.redhat.com/errata/RHSA-2013-0580.html
http://lists.opensuse.org/opensuse-security-announce/2015-06/msg00010.html
http://lists.opensuse.org/opensuse-security-announce/2015-06/msg00006.html
http://lists.opensuse.org/opensuse-security-announce/2015-06/msg00003.html
http://lists.apple.com/archives/security-announce/2013/Jun/msg00000.html