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. http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-5519
This has been integrated into master and will be in 1.3.1.