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ESB-2007.0942 -- [Win] -- Vulnerability Note VU#138633 Invensys Wonderware InTouch creates insecure NetDDE share

Date: 21 November 2007

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             AUSCERT External Security Bulletin Redistribution

                          ESB-2007.0942 -- [Win]
         Vulnerability Note VU#138633 Invensys Wonderware InTouch
                       creates insecure NetDDE share
                             21 November 2007


        AusCERT Security Bulletin Summary

Product:              Invensys Wonderware InTouch 8.0
Operating System:     Windows 2000
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-6033

Original Bulletin:

- --------------------------BEGIN INCLUDED TEXT--------------------

Vulnerability Note VU#138633

Invensys Wonderware InTouch creates insecure NetDDE share


   Invensys Wonderware InTouch 8.0 creates a NetDDE share that could
   allow an attacker to run arbitrary programs.

I. Description

   Invensys Wonderware InTouch HMI Software is used in Supervisory
   Control And Data Acquisition (SCADA) systems.

   Dynamic Data Exchange (DDE) was designed to allow Microsoft
   Windows applications to share data. NetDDE is an extension to DDE
   that was developed by Wonderware. NetDDE allows communications with
   local DDE applications and with remote NetDDE agents using NetBIOS.
   NetDDE is not supported in Windows Vista, but is included in Windows
   NT, 2000, XP, and Server 2003.
   InTouch 8.0 creates a universal NetDDE share. The permissions applied
   to the share may allow a remote attacker to execute arbitrary
   programs. Windows access permissions apply to NetDDE connections,
   however if an attacker can obtain valid credentials, or possibly
   if anonymous connections are enabled, the attacker could connect to
   the NetDDE share and execute programs.

II. Impact

   A remote attacker may be able to execute any application that accepts
   NetDDE connections.

III. Solution


   This issue has been addressed in Wonderware InTouch version 9 and
   later. Wonderware administrators with active support contracts who do
   not want to upgrade can get an updated version of Wonderware 8.0.
   Wonderware Tech Alert 98 contains information about obtaining
   fixed software. Wonderware users that do not have an active support
   contract should contact Wonderware for more information about updates.
   Restrict access
   Per Micrososoft Security Bulletin MS04-031 (which describes an
   unrelated NetDDE vulnerability in Windows), blocking the below ports
   at perirmeter firewalls can prevent remote NetDDE connections.
     * Ports 135/udp, 137/udp, 138/udp, 445/udp, 135/tcp, 139/tcp,
       445/tcp, and 593/tcp
     * All unsolicited inbound traffic on ports greater than 1024
     * Any other specifically configured RPC port

Systems Affected

   Vendor       Status     Date Updated
   Invensys     Vulnerable 19-Nov-2007



   This vulnerability was reported by Neutralbit with assistance from
   Digital Bond.

   This document was written by Ryan Giobbi.

Other Information

            Date Public 11/19/2007
   Date First Published 11/19/2007 10:38:25 AM
      Date Last Updated 11/20/2007
          CERT Advisory
               CVE Name
                 Metric 0.57
      Document Revision 21

   If you have feedback, comments, or additional information about this
   vulnerability, please send us email.

- --------------------------END INCLUDED TEXT--------------------

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