[Full-disclosure] Asbru HardCore Web Content Editor - Command Injection

2006-10-1600:00:00

vulners.com

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n.runs GmbH
http://www.nruns.com/ [email protected]
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

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