lppasswd in CUPS before 1.7.1, when running with setuid privileges, allows local users to read portions of arbitrary files via a modified HOME environment variable and a symlink attack involving .cups/client.conf.
http://www.ubuntu.com/usn/USN-2082-1
http://www.mandriva.com/security/advisories?name=MDVSA-2014:015
http://www.cups.org/blog.php?L704