This security update resolves a privately reported vulnerability in Microsoft Virtual PC and Microsoft Virtual Server. An attacker who successfully exploited this vulnerability could execute arbitrary code and take complete control of an affected guest operating system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
This security update is rated Important for all supported editions of Virtual PC 2004, Virtual PC 2007, and Virtual Server 2005. For more information, see the subsection, Affected and Non-Affected Software, in this section.
The security update addresses the vulnerability by enforcing validation of privilege levels when executing machine instructions. For more information about the vulnerability, see the Frequently Asked Questions (FAQ) subsection for the specific vulnerability entry under the next section, Vulnerability Information.
Recommendation. Microsoft recommends that customers apply the update at the earliest opportunity.
for more information.
Thomas W Shinder, M.D., MCSE
Sr. Consultant / Technical Writer