nwclient.c in ncpfs before 2.2.6 does not drop root privileges before executing utilities using the NetWare client functions, which allows local users to gain privileges.
http://www.securityfocus.com/bid/12400
http://www.securityfocus.com/archive/1/433927/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2005-371.html
http://www.mandriva.com/security/advisories?name=MDKSA-2005:028
http://www.gentoo.org/security/en/glsa/glsa-200501-44.xml