The Nonnoi ASP/Barcode ActiveX control (nonnoi_ASPBarcode.dll) allows remote attackers to overwrite arbitrary files via an argument to the SaveBarcode function.
http://www.securityfocus.com/bid/24822
http://www.securityfocus.com/archive/1/473187
http://www.eleytt.com/advisories/eleytt_NONNOIASPBARCODE.pdf