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ESB-2006.0423 -- [Win] -- Cisco CallManager - RealVNC Remote Authentication Bypass Vulnerability

Date: 23 June 2006
References: AA-2006.0030  AU-2006.0016  

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Click here for PGP verifiable version
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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                          ESB-2006.0423 -- [Win]
  Cisco CallManager - RealVNC Remote Authentication Bypass Vulnerability
                               23 June 2006

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              Cisco CallManager
Publisher:            Cisco Systems
Operating System:     Windows 2000
Impact:               Inappropriate Access
Access:               Remote/Unauthenticated
CVE Names:            CVE-2006-2369

Ref:                  AA-2006.0030
                      AU-2006.0016

Original Bulletin:    
  http://www.cisco.com/warp/public/707/cisco-sr-20060622-cmm.shtml

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Cisco Security Response: RealVNC Remote Authentication Bypass Vulnerability

Document ID: 70509

http://www.cisco.com/warp/public/707/cisco-sr-20060622-cmm.shtml

Revision 1.0

For Public Release 2006 June 22 1530 UTC (GMT)

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

Contents
========

    Cisco Response
    Additional Information
    Revision History
    Cisco Security Procedures

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

Cisco Response
==============

This is Cisco PSIRT's response to the CERT advisory 
http://www.kb.cert.org/vuls/id/117929 and acknowledged by
Real VNC at http://www.realvnc.com/products/free/4.1/release-notes.html
This vulnerability was originally discovered by James Evans.

The original CERT advisory is available at 
http://www.kb.cert.org/vuls/id/117929 

This issue is being tracked by Cisco bug ID:

  * CSCse32811 RealVNC allows remote access to Windows 2000 server 
    console without password.

Additional Information
======================

RealVNC is a remote control access product that is bundled with Cisco
CallManager to provide remote console access.

A vulnerability in RealVNC may allow a malicious user to bypass RealVNC
authentication to gain console access to a Cisco CallManager system.

In the event that a malicious user exploits this vulnerability to gain
access to a Cisco CallManager server, all normal CallManager and
Windows 2000 security will still apply and is intact. While this
vulnerability may provide remote access to a CallManager system, an
attacker will still require Windows and CallManager credentials to
further any attack.

RealVNC has resolved this vulnerability in software version 4.1.2 and
later.

Cisco has made available an update which will update RealVNC to version
4.1.2 and later and is available in CallManager update
win-OS-Upgrade-K9.2000-4-2sr8.exe which may be downloaded at 
http://www.cisco.com/pcgi-bin/tablebuild.pl/cmva-3des 

Workaround
==========

The workaround to this issue is to disable the RealVNC service. Please
consult RealVNC documentation for further details at 
http://www.realvnc.com/documentation.html

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY
KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE
INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT
YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS
DOCUMENT AT ANY TIME.

Revision History
================

+----------------------------------------+
| Revision |              | Initial      |
| 1.0      | 2006-June-22 | public       |
|          |              | release.     |
+----------------------------------------+

Cisco Security Procedures
=========================

Complete information on reporting security vulnerabilities in Cisco
products, obtaining assistance with security incidents, and registering
to receive security information from Cisco, is available on Cisco's
worldwide website at 
http://www.cisco.com/warp/public/707/sec_incident_response.shtml. 
This includes instructions for press inquiries regarding Cisco security 
notices. All Cisco security advisories are available at 
http://www.cisco.com/go/psirt.

- - -----------------------------------------------------------------------
All contents are Copyright  1992-2006 Cisco Systems, Inc. All rights
reserved. 
- - -----------------------------------------------------------------------

Updated: Jun 22, 2006                                Document ID: 70509

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This security bulletin is provided as a service to AusCERT's members.  As
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NOTE: This is only the original release of the security bulletin.  It may
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        http://www.auscert.org.au/render.html?cid=1980

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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