gnc-test-env in GnuCash 2.3.15 and earlier 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=644933
http://www.vupen.com/english/advisories/2010/3060
http://www.vupen.com/english/advisories/2010/2898
http://www.vupen.com/english/advisories/2010/2848
http://www.securityfocus.com/bid/44563
http://www.mandriva.com/security/advisories?name=MDVSA-2010:241
http://secunia.com/advisories/42054
http://secunia.com/advisories/42048
http://lists.fedoraproject.org/pipermail/package-announce/2010-October/050177.html
http://lists.fedoraproject.org/pipermail/package-announce/2010-October/050164.html
http://lists.fedoraproject.org/pipermail/package-announce/2010-November/050269.html