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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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