Samba before 2.2.5 does not properly terminate the enum_csc_policy data structure, which may allow remote attackers to execute arbitrary code via a buffer overflow attack.
http://www.securityfocus.com/bid/5587
http://www.iss.net/security_center/static/10010.php
http://rhn.redhat.com/errata/RHBA-2002-209.html
http://lists.samba.org/archive/samba-technical/2002-June/022075.html