bugtraq - [ GLSA 200903-17 ] Real VNC: User-assisted execution of arbitrary code

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Date: Mon, 9 Mar 2009 14:58:19 +0100
From: Robert Buchholz <rbu@...too.org>
To: gentoo-announce@...too.org
Cc: bugtraq@...urityfocus.com, full-disclosure@...ts.grok.org.uk,
	security-alerts@...uxsecurity.com
Subject: [ GLSA 200903-17 ] Real VNC: User-assisted execution of arbitrary code

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Gentoo Linux Security Advisory                           GLSA 200903-17
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Real VNC: User-assisted execution of arbitrary code
      Date: March 09, 2009
      Bugs: #255225
        ID: 200903-17

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Synopsis
========

The Real VNC client is vulnerable to execution of arbitrary code when
connecting to a malicious server.

Background
==========

Real VNC is a remote desktop viewer display system.

Affected packages
=================

    -------------------------------------------------------------------
     Package       /  Vulnerable  /                         Unaffected
    -------------------------------------------------------------------
  1  net-misc/vnc       < 4.1.3                               >= 4.1.3

Description
===========

An unspecified vulnerability has been discovered int the
CMsgReader::readRect() function in the VNC Viewer component, related to
the encoding type of RFB protocol data.

Impact
======

A remote attacker could entice a user to connect to a malicious VNC
server, or leverage Man-in-the-Middle attacks, to cause the execution
of arbitrary code with the privileges of the user running the VNC
viewer.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Real VNC users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/vnc-4.1.3"

References
==========

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

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200903-17.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@...too.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2009 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5

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