cups is vulnerable to privilege escalation. A possible privilege escalation flaw was found in CUPS. An unprivileged process running as the “lp” user (such as a compromised external filter program spawned by the CUPS server) could trick the CUPS server into overwriting arbitrary files as the root user.
cups.org/articles.php?L596
cups.org/str.php?L3510
rhn.redhat.com/errata/RHSA-2010-0811.html
secunia.com/advisories/43521
security.gentoo.org/glsa/glsa-201207-10.xml
www.debian.org/security/2011/dsa-2176
www.mandriva.com/security/advisories?name=MDVSA-2010:232
www.mandriva.com/security/advisories?name=MDVSA-2010:234
www.redhat.com/security/updates/classification/#important
www.vupen.com/english/advisories/2010/2856
www.vupen.com/english/advisories/2011/0535
access.redhat.com/errata/RHSA-2010:0811
bugzilla.redhat.com/show_bug.cgi?id=605397