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Category:   Application (Generic)  >   Microsoft Virtual PC/Server Vendors:   Microsoft
Microsoft Virtual PC/Server Lets Local Users Gain Elevated Privileges Within a Guest Operating System
SecurityTracker Alert ID:  1022544
SecurityTracker URL:  http://securitytracker.com/id/1022544
CVE Reference:   CVE-2009-1542   (Links to External Site)
Updated:  Mar 10 2010
Original Entry Date:  Jul 14 2009
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): PC 2004 SP1, PC 2007 SP1, Server 2005, Server 2005 R2 SP1; and prior service packs
Description:   A vulnerability was reported in Microsoft Virtual PC/Server. A local user can obtain elevated privileges on the target guest operating system.

The software does not properly validate privilege levels when executing specific instructions in the Virtual Machine Monitor. A local user in the guest operating system can execute commands with kernel level privileges (within the guest).

The host operating system is not affected.

Julien Tinnes and Tavis Ormandy of Google Inc. reported this vulnerability.

Impact:   A local user in a guest operating system can obtain elevated privileges within that guest operating system.
Solution:   The vendor has issued the following fixes:

Microsoft Virtual PC 2004 Service Pack 1:

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 Service Pack 1:

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 Service Pack 1:

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

Microsoft Virtual Server 2005:

http://www.microsoft.com/downloads/details.aspx?FamilyID=092a389a-2296-4c3b-a160-2523154ec764

Microsoft Virtual Server 2005 R2 Service Pack 1:

http://www.microsoft.com/downloads/details.aspx?familyid=1481024D-B430-4D0E-BE16-2F141C6A7E57

Microsoft Virtual Server 2005 R2 x64 Edition Service Pack 1:

http://www.microsoft.com/downloads/details.aspx?familyid=1481024D-B430-4D0E-BE16-2F141C6A7E57

A restart is required.

On March 9, 2010, Microsoft reissued MS09-033 to indicate that Microsoft Virtual Server 2005 is also affected [as listed above].

The Microsoft advisory is available at:

http://www.microsoft.com/technet/security/bulletin/ms09-033.mspx

Vendor URL:  www.microsoft.com/technet/security/bulletin/ms09-033.mspx (Links to External Site)
Cause:   Access control error
Underlying OS:  Windows (Any)

Message History:   None.


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