Date:         Mon, 30 Oct 2000 13:27:02 -0800
From: Foundstone Labs <labs@FOUNDSTONE.COM>
Subject:      Unify eWave ServletExec DoS
To: BUGTRAQ@SECURITYFOCUS.COM

                            Foundstone, Inc.
                        http://www.foundstone.com
                      "Securing the Dot Com World"

                           Security Advisory

                      Unify eWave ServletExec DoS

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FS Advisory ID:         FS-103000-15-SRVX

Release Date:           October 30, 2000

Product:                Unify eWave ServletExec 3.0C

Vendor:                 Unify Corp.
                        (http://www.unifyewave.com/servletexec/)

Type:                   Denial of Service

Severity:               High

Author:                 Shreeraj Shah (shreeraj.shah@foundstone.com)
                        Saumil Shah (saumil.shah@foundstone.com)
                        Stuart McClure (stuart.mcclure@foundstone.com)
                        Foundstone, Inc. (http://www.foundstone.com)

Operating Systems:      All operating systems supported by ServletExec

Vulnerable versions:    Unify eWave ServletExec 3.0C

Foundstone Advisory:    http://www.foundstone.com/advisories.htm
----------------------------------------------------------------------

Description

        Unify's eWave ServletExec is a JSP and a Java Servlet engine
        which is to be used as a plug-in to popular web servers like
        Apache, IIS, Netscape, etc.

        It is possible to send a URL request which causes the
        ServletExec servlet engine to terminate abruptly. The web
        server, however, is not affected.

Details

        It is possible to forcibly invoke any servlet by prefixing
        the path to servlet with "/servlet/" in the URL. A servlet
        called "ServletExec" is present in the server side classes.

        Invoking the "ServletExec" servlet via forced servlet
        invocation causes the servlet engine to re-initialize and
        attempt to bind a server thread on port 80. If the server is
        already running, the port binding causes an exception and
        the servlet engine terminates abruptly.

        For example, if ServletExec is running on 10.0.0.1 as a plug-
        in to a web server on port 80, an attacker can open a
        connection to port 80 and make the following GET request that
        causes the servlet engine to terminate abruptly.

        nc 10.0.0.1 80
        GET /servlet/ServletExec HTTP/1.0

        Or simply access the URL http://10.0.0.1/servlet/ServletExec
        from a browser to the same effect.

        ServletExec generates java.net.BindException and kills the
        servlet engine.

        The following gets recorded in the log file:

        Received an exception when starting ServletExec:
java.net.BindException:
        Address in use: bind

Solution

        Upgrade to ServletExec version 3.0E, available at:

        http://www.servletexec.com/downloads/

        Please contact the vendor for further details at
        info@unify.com or Unify Sales at 1-800-248-6439

Credits

        We would like to thank Unify for their prompt reaction to this
        problem and their co-operation in heightening awareness in the
        security community.

Disclaimer

        The information contained in this advisory is the copyright (C)
        2000 of Foundstone, Inc. and believed to be accurate at the time
        of printing, but no representation or warranty is given, express
        or implied, as to its accuracy or completeness. Neither the
        author nor the publisher accepts any liability whatsoever for
        any direct, indirect or conquential loss or damage arising in
        any way from any use of, or reliance placed on, this information
        for any purpose. This advisory may be redistributed provided that
        no fee is assigned and that the advisory is not modified in any
        way.