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應(yīng)用安全：Web攻擊手段及防御之—網(wǎng)絡(luò)層或漏洞
時間：2018-12-04 14:07:55
文章發(fā)布：李陽
原創(chuàng)作者：未知
來源：51CTO

常見的XSS攻擊、SQL注入、CSRF攻擊等攻擊方式和防御手段，這些都是針對代碼或系統(tǒng)本身發(fā)生的攻擊，另外還有一些攻擊方式發(fā)生在網(wǎng)絡(luò)層或者潛在的攻擊漏洞在這里也總結(jié)一下。


DOS/DDOS攻擊


DOS攻擊不是說攻擊DOS系統(tǒng)，或者通過DOS系統(tǒng)攻擊。


DOS攻擊全稱為Denial of service，即拒絕服務(wù)，其主要攻擊目的是使計(jì)算機(jī)硬件或網(wǎng)絡(luò)寬帶資源耗盡從而造成服務(wù)器無法提供正常服務(wù)，而DDOS攻擊就是Distributed denial of service，即分布式的拒絕服務(wù)攻擊，攻擊者利用多臺服務(wù)器資源對同一個目標(biāo)服務(wù)器發(fā)起攻擊，從而使目的服務(wù)器快速陷入崩潰。


應(yīng)用安全：Web攻擊手段及防御之—網(wǎng)絡(luò)層或漏洞-藝源科技


不管是DOS還是DDOS，它們的本質(zhì)都是通過各種手段消耗目標(biāo)服務(wù)器資源，從而使目標(biāo)服務(wù)器癱瘓不能接受用戶的服務(wù)。


一般租用像阿里云或者其他的服務(wù)器資源都是有web應(yīng)用防火墻能阻止dos攻擊的，如果是自己的服務(wù)器需要專業(yè)的運(yùn)維人員對服務(wù)器進(jìn)行相關(guān)設(shè)置以防止DOS攻擊。


DNS攻擊


DNS攻擊包括有DNS劫持和DNS污染。


DNS劫持即通過某種手段控制DNS服務(wù)器，篡改域名真實(shí)的解析結(jié)果，并返回攻擊者的ip地址，從而跳到了攻擊者的頁面。像我們寬帶快到期了或者有什么推廣信息，電信總會彈出一個營銷界面提示我們寬帶快到期了或者什么活動的，這其實(shí)就是運(yùn)營商DN劫持搞的鬼。像在我們本地，也經(jīng)常會配置host文件以開發(fā)測試聯(lián)調(diào)，或者訪問那些訪問不了你又想訪問的網(wǎng)址。


防止DNS劫持可以用國外知名的DNS服務(wù)器，像google的8.8.8.8，或者準(zhǔn)備兩個域名，一個被劫持了引導(dǎo)用戶去訪問另一個。


DNS污染發(fā)生在請求DNS解析前第一步，直接在協(xié)議上對DNS解析請求進(jìn)行干擾，因?yàn)镈NS查詢是基于不可靠無連接的UDP協(xié)議，它是沒有經(jīng)過認(rèn)證的，很容易被篡改，所以攻擊者通過在UDP的53端口進(jìn)行DNS查詢檢測，并返回攻擊者錯誤的解析結(jié)果給用戶，這就是DNS污染。


DNS污染可以通過自己搭建DNS服務(wù)器，采用TCP加密的形式，但可能延遲比較大。


錯誤回顯


這個在SQL注入防御篇幅中有描述，就是不能把數(shù)據(jù)庫表及代碼關(guān)鍵信息輸出到用戶瀏覽器，這里不再詳細(xì)描述。


網(wǎng)頁注釋


為了開發(fā)或聯(lián)調(diào)的便利性，我們經(jīng)常在代碼使用注釋，某些注釋可能包括重要信息，給攻擊者以可乘之機(jī)，所以這個養(yǎng)成良好的習(xí)慣及時刪除敏感的注釋或者開發(fā)完成對代碼進(jìn)行審視。


文件上傳


一般的網(wǎng)站都會有文件上傳功能，如人才網(wǎng)就會有包括用戶的頭像、簡歷附件什么的，如果攻擊者上傳一個.exe可執(zhí)行程序到服務(wù)器，那么這個執(zhí)行程序很有可能操控這個服務(wù)器，或者通過這個服務(wù)器間接攻擊其他內(nèi)部服務(wù)器群，后果是十分嚴(yán)重的。


所以，針對上傳功能要限制用戶可上傳的文件類型，比如頭像肯定是jpg等圖片格式；文件分開存儲，一是能提高系統(tǒng)性能，二是就算攻擊者攻擊了文件服務(wù)器也不一定能攻擊到別的服務(wù)器；另外，存儲采用重命名方式，像QQ之間傳送文件一般會在文件名后面加上一個".重命令"后綴，就是為了防止用戶點(diǎn)擊.exe文件造成病毒攻擊。

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