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             AUSCERT External Security Bulletin Redistribution

                        ESB-2009.0079 -- [Solaris]
 A Security Vulnerability in the vncviewer(1) RFB Protocol Validation May
  Allow Execution of Arbitrary Code and Lead to a Denial of Service (DoS)
                              21 January 2009

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

Product:              Solaris 10 Operating System
                      OpenSolaris
Publisher:            Sun Microsystems
Operating System:     Solaris
Impact:               Execute Arbitrary Code/Commands
                      Denial of Service
Access:               Remote/Unauthenticated
CVE Names:            CVE-2008-4770

Original Bulletin:    
  http://sunsolve.sun.com/search/document.do?assetkey=1-26-248526-1

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Solution Type Sun Alert

Solution  248526 :   A Security Vulnerability in the vncviewer(1) RFB 
Protocol Validation May Allow Execution of Arbitrary Code and Lead to a 
Denial of Service (DoS)  

Bug ID
6777095

Product
Solaris 10 Operating System
OpenSolaris

Date of Resolved Release
12-Jan-2009

SA Document Body

A Security Vulnerability in the vncviewer(1) RFB Protocol Validation May 
Allow Execution of Arbitrary Code and Lead to a Denial of Service (DoS)


1. Impact

The VNC viewer for X (vncviewer(1)) contains a security vulnerability 
within the validation function for the server-supplied RFB protocol data 
that may allow a remote unprivileged user to execute arbitrary code with 
the privileges of the local user and crash the viewer.  The ability to 
crash the VNC viewer is a type of Denial of Service (DoS).

This issue is described in the following documents:

http://www.realvnc.com/pipermail/vnc-list/2008-November/059432.html

CVE-2008-4770 at http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4770

2. Contributing Factors

This issue can occur in the following releases:

SPARC Platform

    * Solaris 10 5/08 or 10/08 without patch 140455-01
    * OpenSolaris based upon builds snv_78 through snv_104

x86 Platform

    * Solaris 10 5/08 or 10/08 without patch 140456-01
    * OpenSolaris based upon builds snv_78 through snv_104

    1. Solaris 8 and 9 do not ship with the VNC Viewer software and are 
       therefore not impacted by this issue.

    2. Only OpenSolaris installations including the affected binary 
       /usr/bin/vncviewer, are impacted by this issue.

    3. OpenSolaris distributions may include additional bug fixes above and 
       beyond the base build from which it was derived.  The base build can 
       be derived as follows:

       $ uname -a
       SunOS osolsys 5.11 snv_86 i86pc i386 i86pc

3. Symptoms

There are no predictable symptoms that would indicate this issue has been 
exploited to execute arbitrary code.

In a Denial of Service occurrence, vncviewer(1) will exit prematurely and 
may generate an error message that references a segmentation violation and 
may also create a core(4) file.

4. Workaround

To avoid this issue until patches can be applied, connect only to trusted VNC 
servers.

5. Resolution

This issue is addressed in the following releases:

SPARC Platform

    * Solaris 10 with patch 140455-01 or later
    * OpenSolaris based upon builds snv_105 or later

x86 Platform

    * Solaris 10 with patch 140456-01 or later
    * OpenSolaris based upon builds snv_105 or later

For more information on Security Sun Alerts, see Technical Instruction ID 
213557.

This Sun Alert notification is being provided to you on an "AS IS" basis. 
This Sun Alert notification may contain information provided by third 
parties. The issues described in this Sun Alert notification may or may not 
impact your system(s). Sun makes no representations, warranties, or 
guarantees as to the information contained herein. ANY AND ALL WARRANTIES, 
EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION WARRANTIES OF 
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE 
HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT YOU ACKNOWLEDGE THAT SUN SHALL 
IN NO EVENT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, PUNITIVE, OR 
CONSEQUENTIAL DAMAGES THAT ARISE OUT OF YOUR USE OR FAILURE TO USE THE 
INFORMATION CONTAINED HEREIN. This Sun Alert notification contains Sun 
proprietary and confidential information. It is being provided to you 
pursuant to the provisions of your agreement to purchase services from Sun, 
or, if you do not have such an agreement, the Sun.com Terms of Use. This Sun 
Alert notification may only be used for the purposes contemplated by these 
agreements.

Copyright 2000-2008 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 
CA 95054 U.S.A. All rights reserved.

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