artswrapper in aRts, when running setuid root on Linux 2.6.0 or later versions, does not check the return value of the setuid function call, which allows local users to gain root privileges by causing setuid to fail, which prevents artsd from dropping privileges.
https://exchange.xforce.ibmcloud.com/vulnerabilities/27221
http://www.mandriva.com/security/advisories?name=MDKSA-2006:107
http://www.kde.org/info/security/advisory-20060614-2.txt
http://www.gentoo.org/security/en/glsa/glsa-200606-22.xml
http://slackware.com/security/viewer.php?l=slackware-security&y=2006&m=slackware-security.468256
http://security.gentoo.org/glsa/glsa-200704-22.xml
http://mail.gnome.org/archives/beast/2006-December/msg00025.html