Multiple stack-based buffer overflows in the HanGamePluginCn18.HanGamePluginCn18.1 ActiveX control in HanGamePluginCn18.dll in Ourgame GLWorld 2.6.1.29 (aka Lianzong Game Platform) allow remote attackers to execute arbitrary code via long arguments to the (1) hgs_startGame and (2) hgs_startNotify methods, as exploited in the wild as of February 2008.  NOTE: some of these details are obtained from third party information.