网络安全之xss靶场练习

目录

一、xss靶场练习

1、Ma Spaghet!

2、Jefff

第一个方法

第二个方法

3、Ugandan Knuckles

4、Ricardo Milos

5、Ah That's Hawt

6、Ligma

7、Mafia​编辑

8、Ok, Boomer

一、xss靶场练习

靶场地址

https://xss.pwnfunction.com/

 页面显示如下

1、Ma Spaghet!

分析源码

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。

<script>alert(1)</script>

发现没有弹窗，为什么呢？于是在官方文档查看

原因：不同点在innerHTML，所以发现该函数存在安全问题，该函数里的script不会被html5执行，所以我们用img标签来绕过

<img src=1 onerror=alert(1337)>

成功了

2、Jefff

我们直接分析上述代码，和上一个游戏一样，还是有一个jeff参数，但是这次多了一个eval函数，这个函数究竟起到什么作用了呢，我们依然看官方文档。


eval会把字符串当成javascript代码执行，所以我们尝试用以下alert(1337)

eval只会接一个参数，但会分情况，如果第二个参数是字符串，则eval只会接受一个参数，如果第二个参数是函数，eval则会接受该函数并执行

第一个方法

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

第二个方法

使用连接符

jeff="-alert(1)-"

3、Ugandan Knuckles

分析源码，发现我们的传参在input当中，而且还没有过滤双引号，那我可以尝试闭合双引号，逃逸出来，做我们想做的事情，我们使用onclick来实现这一关的需求，但是由于题目有不能交互这样的限制，那么我们就不可以使用onclick，毕竟这一关过滤了<>,但是我想到了input有着焦点的功能，那我们使用onfocus+autofocus来实现

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

4、Ricardo Milos

查看源码后发现，这一关有action，而在action中可以使用伪协议，同时这一关会在进入页面后两秒钟自动提交，那就简单了

?ricardo=javascript:alert(1337)

5、Ah That's Hawt

这里我们有一个清晰的sink will.innerHTML，但由于过滤器删除了（）`字符，因此无法调用alert（1337）。但是过滤器忘记了考虑属性的值可以是HTML实体编码的，因此我们只是对有效载荷进行编码。此外，我们对有效载荷进行URL编码，因为它有一些URL不安全的字符，如&。

通过分析代码，我们发现这一关有正则表达式，过滤了（）`\并且是全局过滤，这样一来，不能使用()就对弹窗很不利，那么我首先想到的办法就是编码，利用编码进行二次解析进行绕过

原语句 <svg onload="alert(1337)">
实体编码 <svg onload="&#x61;&#x6C;&#x65;&#x72;&#x74;&#x28;&#x31;&#x33;&#x33;&#x37;&#x29;">
url编码 %3Csvg%20onload%3D%22%26%23x61%3B%26%23x6C%3B%26%23x65%3B%26%23x72%3B%26%23x74%3B%26%23x28%3B%26%23x31%3B%26%23x33%3B%26%23x33%3B%26%23x37%3B%26%23x29%3B%22%3E

最终payload

?markassbrownlee=%3Csvg%20onload%3D%22%26%23x61%3B%26%23x6C%3B%26%23x65%3B%26%23x72%3B%26%23x74%3B%26%23x28%3B%26%23x31%3B%26%23x33%3B%26%23x33%3B%26%23x37%3B%26%23x29%3B%22%3E

6、Ligma

看完这一关后的源码后，发现过滤了大A到大Z，小A到小Z，0-9，那这时候我们也不能使用编码，我想到了使用jsfuck网站加密，那这样无法被url解析，我们需要改为urlcode编码方式

原输入 alert(1337)
JSFuck加密 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7、Mafia

绕过方法
定义匿名函数，利用匿名函数的参数构造payload，同时使用正则表达式来绕过alert字符串的检测。
利用数字和字符串之间的互相转换，来绕过针对alert的检测。
在URL地址后面加上#${payload}，然后通过location.hash.slice(1)来获取payload，也能做到绕过检测。

分析源码明显可以看出，这一关过滤了`, ', ",+,-,!,\,[,]并且过滤了弹窗函数alert,这样的一个正则，同时也限制了一个长度“截取长度50的字符串”
最常用的三个函数，alert、prompt、confirm，三个函数都能实现弹窗 alert被限制

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

很明显，我们的这两个弹窗函数可以完美的绕过他这个正则，但如果这两个函数都被过滤了呢，

如果都过滤了那我们就使用Function构造函数

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

8、Ok, Boomer

发现这个题目使用了DOMPurify这个第三方库来过滤非法字符

通过get参数将内容写入h2标签内，而且有过滤框架DOMPurify，DOMPurify防御用户输入框架，会把你的危险属性过滤完了，而这个过滤框架由安全团队cure53开发，以我们的技术很难绕过。但是注意setTimeout函数内的ok参数这里的JS代码是没有任何关于ok参数的定义的，所以我们可以使用DOM破坏

查看页面源代码，我们发现突破口在setTimeout（ok，2000）

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

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