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Vulnerability of VNC: privilege elevation

Synthesis of the vulnerability 

A local attacker can elevate his privileges via a vulnerability of VNC Server Service-Mode.
Impacted systems: RealVNC.
Severity of this alert: 2/4.
Creation date: 30/07/2009.
Références of this alert: VIGILANCE-VUL-8903.

Description of the vulnerability 

The VNC Enterprise Edition and VNC Personal Edition products can be started in:
 - User-Mode : direct execution
 - Service-Mode : execution as a Windows/Unix service

When Service-Mode is used, an attacker with access to the console of the host system can elevate his privileges.

 This vulnerability may be used by a local attacker to use the service in order to become administrator.
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This computer weakness announce impacts software or systems such as RealVNC.

Our Vigil@nce team determined that the severity of this security alert is medium.

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this vulnerability.

Solutions for this threat 

VNC: version 4.4.4 and 4.5.1.
Version 4.4.4/4.5.1 is corrected:
VNC Personal Edition 4.4.4
  http://www.realvnc.com/cgi-bin/download.cgi?product=personal4;filever=4.4.4;haveDetails=1
VNC Personal Edition 4.5.1
  http://www.realvnc.com/download/personal/4.5.1
VNC Enterprise Edition 4.4.4
  http://www.realvnc.com/cgi-bin/download.cgi?product=enterprise4/winvnc;filever=4.4.4;haveDetails=1
VNC Enterprise Edition 4.5.1
  http://www.realvnc.com/download/enterprise/4.5.1
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