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Microsoft Virtual PC and Virtual Server Privilege Escalation Vulnerability

Risk

Medium

Date Discovered

July 14, 2009

Description

Microsoft Virtual PC and Virtual Server are prone to a privilege-escalation vulnerability caused by an error in decoding privileged instructions. Note that this issue affects only systems that do not use hardware-assisted virtualization. Successful exploits may allow local attackers to elevate privileges within a guest operating system.

Technologies Affected

  • Microsoft Virtual PC 2004
  • Microsoft Virtual PC 2004 SP1
  • Microsoft Virtual PC 2007
  • Microsoft Virtual PC 2007 SP1
  • Microsoft Virtual PC 2007 x64 Edition
  • Microsoft Virtual PC 2007 x64 Edition SP1
  • Microsoft Virtual Server 2005 Enterprise Edition
  • Microsoft Virtual Server 2005 Enterprise Edition R2
  • Microsoft Virtual Server 2005 R2 SP1
  • Microsoft Virtual Server 2005 R2 SP1 x64 Edition
  • Microsoft Virtual Server 2005 Standard Edition
  • Microsoft Virtual Server 2005 Standard Edition R2

Recommendations

Permit local access for trusted individuals only. Where possible, use restricted environments and restricted shells.

Allow only trusted individuals to have local accounts and physical access to vulnerable computers and resources.
The vendor has released an advisory and updates. Please see the references for details.

Credits

Julien Tinnes and Tavis Ormandy of Google Inc
Copyright © Symantec Corporation.
Permission to redistribute this alert electronically is granted as long as it is not edited in any way unless authorized by Symantec Security Response. Reprinting the whole or part of this alert in any medium other than electronically requires permission from secure@symantec.com.

Disclaimer
The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
Symantec, Symantec products, Symantec Security Response, and secure@symantec.com are registered trademarks of Symantec Corp. and/or affiliated companies in the United States and other countries. All other registered and unregistered trademarks represented in this document are the sole property of their respective companies/owners.

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