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。

DVWA—File Upload 文件上传

  • 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。

DVWA—File Upload 文件上传

  • 成功进入电脑内部

DVWA—File Upload 文件上传

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。

    DVWA—File Upload 文件上传

  • 我们先把之前的文件后缀名改为png

DVWA—File Upload 文件上传

  • 打开burp suite准备抓包

DVWA—File Upload 文件上传

  • 将抓到的hack.png改为hack.php。

DVWA—File Upload 文件上传

  • 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。

DVWA—File Upload 文件上传

  • 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。

DVWA—File Upload 文件上传

  • 上传成功。

DVWA—File Upload 文件上传

  • 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。

DVWA—File Upload 文件上传

  • 那么可以利用这个url实现蚁剑的连接。

DVWA—File Upload 文件上传

  • 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。

DVWA—File Upload 文件上传

  • 将cookie抓包,在蚁剑里粘贴。

DVWA—File Upload 文件上传

  • !!成功连接!!

DVWA—File Upload 文件上传

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