Asbru HardCore Web Content Editor - Command Injection

[<security () nruns com>]

________________________________________________________________________

n.runs GmbH                                        
http://www.nruns.com/                                 security () nruns com
n.runs-SA-2006.001                                           15-Oct-2006
________________________________________________________________________

Vendor:            Asbru Software, http://asbrusoft.com
Product:               Asbru HardCore Web Content Editor,
http://editor.asbrusoft.com/
Vulnerability:         Command Injection 

________________________________________________________________________

Vendor communication:

  2006/10/05            initial notification of AsbruSoft
  2006/10/08            fix was created over the weekend, released
                                                    on Oct 8. 
________________________________________________________________________

Overview:
 
The Asbru Software Web Content Editor allows for web-based advanced text 
processing, replacing the typical TEXTAREA input fields with a rich user
interface,
offering HTML editing capabilities, formatting and various other features. 
It integrates with Asbru Software's Content Management System, works with 
most modern browsers and comes in versions for ASP, ASP.NET, PHP, 
ColdFusion and JSP. 

Description:
 The spell checking feature uses ASpell, which is invoked through the
respective 
language's process creation commands, such as proc_open() in PHP, Runtime's
exec() method in JSP, shell.Run() in ASP and the like.  All these
invocations are 
prone to a command injection attack, since ASpell's dictionary argument is 
specified from a HTTP request parameter and the input is not sanitized. 
This leads to immediate shell command execution if an attacker carefully 
crafts this parameter's value.  The vulnerability is *only* present if the 
spell checking capability is in use.

Solution: 
AsbruSoft reacted very quickly. The vulnerability was reported on Oct 5 and
a 
fix was created over the weekend, released on Oct 8. The updated version
6.0.22  is available from 
http://editor.asbrusoft.com/page.php/id=727.   
________________________________________________________________________

Credit: 
  Bug found by Jan Muenther of n.runs GmbH. Thanks  
________________________________________________________________________

References: None  
________________________________________________________________________

The information provided is released by n.runs "as is" without warranty
of any kind. n.runs disclaims all warranties, either express or implied,
expect for the warranties of merchantability. In no eventshall n.runs be
liable for any damages whatsever including direct, indirect, incidental,
consequential, loss of business profits or special damages, even if
n.runs has been advised of the possibility of such damages.
Distribution or Reproduction of the information is provided that the 
advisory is not modified in any way.

Copyright 2006 n.runs. All rights reserved. Terms of use.
________________________________________________________________________

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/