Ardour 2.8.11 places a zero-length directory name in the LD_LIBRARY_PATH, which allows local users to gain privileges via a Trojan horse shared library in the current working directory.
https://bugzilla.redhat.com/show_bug.cgi?id=638365
http://www.vupen.com/english/advisories/2010/2678
http://www.securityfocus.com/bid/44106
http://secunia.com/advisories/41872
http://lists.fedoraproject.org/pipermail/package-announce/2010-October/049377.html
http://lists.fedoraproject.org/pipermail/package-announce/2010-October/049373.html
http://lists.fedoraproject.org/pipermail/package-announce/2010-October/049333.html