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TITLE:
Microsoft Virtual PC / Virtual Server Privilege Escalation
Vulnerability

SECUNIA ADVISORY ID:
SA35808

VERIFY ADVISORY:
http://secunia.com/advisories/35808/

DESCRIPTION:
A vulnerability has been reported in Microsoft Virtual PC and
Microsoft Virtual Server, which can be exploited by malicious, local
users to gain escalated privileges.

The vulnerability is caused due to the application not properly
validating required CPU privilege levels of certain machine
instructions running within the guest operating system environment.
This can be exploited to execute arbitrary code with escalated
privileges on the guest operating system.

Successful exploitation requires a valid user account on the guest
operating system.

SOLUTION:
Apply patches.

Microsoft Virtual PC 2004 SP1:
http://www.microsoft.com/downloads/details.aspx?familyid=56A160E1-59B5-45BC-AECF-DFE614A7EFAD

Microsoft Virtual PC 2007:
http://www.microsoft.com/downloads/details.aspx?familyid=5318C1FA-DAF1-4028-832B-EAEC9906A46A

Microsoft Virtual PC 2007 SP1:
http://www.microsoft.com/downloads/details.aspx?familyid=88DE1513-8D35-410F-8896-FE668F885CA0

Microsoft Virtual PC 2007 x64 Edition:
http://www.microsoft.com/downloads/details.aspx?familyid=5318C1FA-DAF1-4028-832B-EAEC9906A46A

Microsoft Virtual PC 2007 x64 Edition SP1:
http://www.microsoft.com/downloads/details.aspx?familyid=88DE1513-8D35-410F-8896-FE668F885CA0

Microsoft Virtual Server 2005 R2 SP1:
http://www.microsoft.com/downloads/details.aspx?familyid=1481024D-B430-4D0E-BE16-2F141C6A7E57

Microsoft Virtual Server 2005 R2 x64 Edition SP1:
http://www.microsoft.com/downloads/details.aspx?familyid=1481024D-B430-4D0E-BE16-2F141C6A7E57

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Julien Tinnes and Tavis Ormandy of Google Inc.

ORIGINAL ADVISORY:
MS09-033 (KB969856)
http://www.microsoft.com/technet/security/Bulletin/MS09-033.mspx

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