描述

1797-OE8

网络防火墙通过设置不同的安全规则来控制设备或系统之间的数据流，在实际应用中主要用于分析与互联网连接的TCP/IP协议簇。防火墙在网络中使用的前提是必须保证网络的连通性，其通过规则设置和协议分析，来限制和过滤那些对管理比较敏感、不安全的信息，防止未经授权的访问。由于工业控制与商用网络的差异，常规的网络安全设置规则用在控制网络上就会存在很多问题。只有正确地设计、配置和维护硬件防火墙的规则，才可以保护工业控制网络系统的安全环境。建议设置的特殊规则包括：
SCADA和工业协议。MODBUS/TCP、EtherNet/IP和DNP3等在工业控制系统中被大量使用，但是这些协议在设计时没有安全加密机制，通常也不会要求任何认证便可以在远程对一个控制装置执行命令。这些协议应该只被允许在控制网络单向传输，不准许在办公网络穿透到控制网络。能够完成这一功能的工业防火墙或者安全路由器，通常被部署在具有以太网接口的I/O设备和控制器上，从而避免因设备联网而造成的病毒攻击或广播风暴，还可以避免各子系统间的病毒攻击和干扰。
分布式组件对象模型(DCOM)。在过程控制中，OLE和ProfiNet(OPC)是使用DCOM的，它运用了微软的远程过程调用服务。该服务有很多的漏洞，很多病毒都会利用这个弱点获取系统权限。此外OPC也利用DCOM动态地打开任意端口，这在防火墙中进行过滤是非常困难的。通用防火墙无法完成对OPC协议的规则限制，如果必须需要该协议，则要求控制网络、网络之间必须物理分开，将控制网络和企业网络横向隔离。

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1797-OE8

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