描述
3BDH000607R1 pm876
超文本傳輸協(xié)議(HTTP)。一般來說，HTTP不應(yīng)該被允許從企業(yè)管理網(wǎng)透過進(jìn)入控制網(wǎng)絡(luò)，因為他們會帶來重大安全風(fēng)險。如果HTTP服務(wù)到控制網(wǎng)絡(luò)是絕對必需的，那么在防火墻中需要通過HTTP代理配置來阻止所有執(zhí)行腳本和Java應(yīng)用程序，而且特定的設(shè)備使用HTTPS更安全。
限制文件傳輸協(xié)議(FTP)。FTP用于在設(shè)備之間傳輸、交換文件，在SCADA、dcs、PLC、RTU等系統(tǒng)中都有應(yīng)用。FTP協(xié)議并沒有任何安全原則，登入密碼不加密，有些FTP為了實現(xiàn)歷史緩沖區(qū)而出現(xiàn)溢出的漏洞，所以應(yīng)配置防火墻規(guī)則阻塞其通信。如果FTP通訊不能被要求禁止，通過FTP輸出數(shù)據(jù)時，應(yīng)額外增加多個特征碼授權(quán)認(rèn)證，并提供加密的通信隧道。
簡單郵件傳輸協(xié)議(SMTP)。SMTP在互聯(lián)網(wǎng)上是主要的電子郵件傳輸協(xié)議。電子郵件經(jīng)常包含惡意代碼程序，所以不應(yīng)允許以任何控制網(wǎng)絡(luò)設(shè)備接收電子郵件，SMTP郵件應(yīng)主要用于從控制網(wǎng)絡(luò)到辦公網(wǎng)絡(luò)之間輸出發(fā)送報警信息。簡單網(wǎng)絡(luò)管理協(xié)議(SNMP)。SNMP是網(wǎng)絡(luò)管理服務(wù)中心，提供管理控制臺與設(shè)備如網(wǎng)絡(luò)設(shè)備、打印機(jī)、PLC之間的監(jiān)控，并制定管理的會話規(guī)則。從運維角度看，SNMP是非常有用的服務(wù)，但在安全方面存在很多問題。SNMPV1和SNMPV2C的安全機(jī)制比較脆弱，通信不加密，所有通信字符串和數(shù)據(jù)都以明文形式發(fā)送。攻擊者一旦捕獲了網(wǎng)絡(luò)通信，就可以利用各種嗅探軟件直接獲取通信字符串，即使用戶改變了通信字符串的默認(rèn)值也無濟(jì)于事。SNMPV3解決了上述安全性問題，但卻沒有被廣泛使用。從控制網(wǎng)中使用SNMPV1和V2C的命令都應(yīng)被禁止，除非它是一個完全獨立的信任管理網(wǎng)絡(luò)。而即使設(shè)備已經(jīng)支持SNMPV3，許多廠商使用的還是標(biāo)準(zhǔn)的通信字符串，存在重大安全隱患。因此，雖然SNMPV3比以前的版本提供了更多的安全特性，如果配置不當(dāng)，其實際效果仍舊有限，這一點也需要引起足夠的重視。
產(chǎn)品承諾：
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢價格，大量現(xiàn)貨。
主營DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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