DVWA—File Upload 文件上传

Low

• 源代码：

<?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' ] );

    // Can we move the file to the upload folder?
    if( !move_uploaded_file( $_FILES[ 'uploaded' ][ 'tmp_name' ], $target_path ) ) {
        // No
        echo '<pre>Your image was not uploaded.</pre>';
    }
    else {
        // Yes!
        echo "<pre>{$target_path} succesfully uploaded!</pre>";
    }
}

?> 

• 虽然要求我们上传图片文件，但好像后端并没有限制，直接php上传一句话木马。

• 上传成功，也返回了我们的上传路径，打开中国蚁剑连接木马。

• 成功进入电脑内部

Medium

• 源代码：

<?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_type = $_FILES[ 'uploaded' ][ 'type' ];
    $uploaded_size = $_FILES[ 'uploaded' ][ 'size' ];

    // Is it an image?
    if( ( $uploaded_type == "image/jpeg" || $uploaded_type == "image/png" ) &&
        ( $uploaded_size < 100000 ) ) {

        // Can we move the file to the upload folder?
        if( !move_uploaded_file( $_FILES[ 'uploaded' ][ 'tmp_name' ], $target_path ) ) {
            // No
            echo '<pre>Your image was not uploaded.</pre>';
        }
        else {
            // Yes!
            echo "<pre>{$target_path} succesfully uploaded!</pre>";
        }
    }
    else {
        // Invalid file
        echo '<pre>Your image was not uploaded. We can only accept JPEG or PNG images.</pre>';
    }
}

?> 

• 可以看到已经对我们上传文件的类型做了限制，再上传其他文件会失败。

  

• 我们先把之前的文件后缀名改为png

• 打开burp suite准备抓包

• 将抓到的hack.png改为hack.php。

• 上传成功。

High

• 源代码：

<?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>';
    }
}

?> 

• 可以看到直接对后缀名有了限制，看来只能上传一张真正的照片文件了。
• 我们采用拼接的方法，把一张正常的照片和一句话php木马合在一起。形成hack3.jpg。

• 用记事本打开照片，可以发现我们的木马已经成功藏在了最后。

• 上传成功。

• 现在的问题是，蚁剑也只会把它当作一个jpg文件，我们该怎样让文件被解析而触发我们的后门呢？

• 想到了上一个模块，文件包含File Inclusion可以帮助我们解析文件。

• 那么可以利用这个url实现蚁剑的连接。

• 发现好像失败了...连接不上，查询资料得知我们还需要之前文件包含的cookie才行，打开burp suite抓包。

• 将cookie抓包，在蚁剑里粘贴。

• ！！成功连接！！

标签：uploaded,文件,was,image,Upload,DVWA,echo,File,上传
来源： https://www.cnblogs.com/yuuuuu422/p/13510196.html