The web interface in CUPS 1.7.4 allows local users in the lp group to read arbitrary files via a symlink attack on a file in /var/cache/cups/rss/ and language[0] set to null. NOTE: this vulnerability exists because of an incomplete fix for CVE-2014-3537.
https://cups.org/str.php?L4455
http://www.ubuntu.com/usn/USN-2341-1
http://www.openwall.com/lists/oss-security/2014/07/22/2
http://www.openwall.com/lists/oss-security/2014/07/22/13
http://www.mandriva.com/security/advisories?name=MDVSA-2015:108
http://www.debian.org/security/2014/dsa-2990
http://secunia.com/advisories/60787
http://secunia.com/advisories/60509