[NEWS] Macromedia JRun Admin Server Authentication Bypass

From: support@securiteam.com
Date: 07/01/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Mon,  1 Jul 2002 07:35:05 +0200 (CEST)

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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  Macromedia JRun Admin Server Authentication Bypass
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SUMMARY

JRun is Macromedia's servlet / JSP engine. It installs a web based
administration console on TCP port 8000. Before the console can be used by
users, they are required to login via an HTML form. This form can be
bypassed and administrative functions accessed without authentication.

DETAILS

Vulnerable systems:
 * JRun versions 3.0/3.1/4.0 (Without the patch)

Immune systems:
 * JRun versions 3.0/3.1/4.0 (With the patch)

The login form is the default page served up by the server on port 8000.
By inserting an extra '/' in the URL we bypass the login form and gain
access to the web based admin console, e.g.:
http://JRun-Server//

We do not have unrestricted access to the admin console - clicking on
further links returns you to the login page. However, by requesting the
desired admin function in the initial URL we bypass this restriction also,
e.g.:
JRun-Server:8000//welcome.jsp?&action=stop&server=default

Will shutdown the 'default' JRun server instance on port 8100. Other
administrative functions can also be accessed.

Patch Information:
Macromedia have produced a cumulative patch for JRun 3.0/3.1/4.0,
availability of which is described in the bulletin at:
 <http://www.macromedia.com/v1/handlers/index.cfm?ID=23164>
http://www.macromedia.com/v1/handlers/index.cfm?ID=23164

ADDITIONAL INFORMATION

The information has been provided by <mailto:matt@westpoint.ltd.uk> Matt
Moore.

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