Samba 3.2.0 uses weak permissions (0666) for the (1) group_mapping.tdb and (2) group_mapping.ldb files, which allows local users to modify the membership of Unix groups.
https://exchange.xforce.ibmcloud.com/vulnerabilities/44678
http://www.vupen.com/english/advisories/2008/2440
http://www.securityfocus.com/bid/30837
http://www.openwall.com/lists/oss-security/2008/08/26/2
http://secunia.com/advisories/31601