Unknown vulnerability in the nfs_mount call in Mac OS X 10.3.9 and earlier allows local users to gain privileges via crafted arguments.
http://www.kb.cert.org/vuls/id/713614
http://lists.apple.com/archives/security-announce/2005/May/msg00004.html
http://lists.apple.com/archives/security-announce/2005/Apr/msg00000.html