Network Appliance Data ONTAP 7.0 and earlier allows iSCSI Initiators to bypass iSCSI authentication via a modified client that skips the Security (Start) mode, as required by the Login Negotiation protocol, and uses Operational mode without proving identity.
http://www.vupen.com/english/advisories/2005/2193
http://www.securityfocus.com/bid/15197
http://www.matasano.com/advisories/netapp-iSCSI.txt
http://securitytracker.com/id?1015103