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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.0925
         Microsoft Security Bulletin MS16-045: Security Update for
                         Windows Hyper-V (3143118)
                               13 April 2016

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Microsoft Windows with Hyper-V
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
                   Access Privileged Data          -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-0090 CVE-2016-0089 CVE-2016-0088

Original Bulletin: 
   https://technet.microsoft.com/en-us/library/security/MS16-045

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Microsoft Security Bulletin MS16-045: Security Update for Windows Hyper-V
(3143118)

Bulletin Number: MS16-045

Bulletin Title: Security Update for Windows Hyper-V

Severity: Important

KB Article: 3143118

Version: 1.0

Published Date: April 12, 2016

Executive Summary

This security update resolves vulnerabilities in Microsoft Windows. The
most severe of the vulnerabilities could allow remote code execution if an
authenticated attacker on a guest operating system runs a specially crafted
application that causes the Hyper-V host operating system to execute arbitrary
code. Customers who have not enabled the Hyper-V role are not affected.

This security update is rated Important for all supported editions of Windows
8.1 for x64-based Systems, Windows Server 2012, Windows Server 2012 R2,
and Windows 10 for x64-based Systems.

Affected Software

Windows 8.1 for x64-based Systems (3135456)

Windows Server 2012 and Windows Server 2012 R2

Windows 10 for x64-based Systems[1](3147461)

Windows Server 2012 (Server Core installation)(3135456)

Windows Server 2012 R2 (Server Core installation)(3135456)

[1]Windows 10 updates are cumulative. The monthly security release includes
all security fixes for vulnerabilities that affect Windows 10, in addition
to non-security updates. The updates are available via the Microsoft Update
Catalog.

Vulnerability Information

Hyper-V Remote Code Execution Vulnerability - CVE-2016-0088

A remote code execution vulnerability exists when Windows Hyper-V on a
host server fails to properly validate input from an authenticated user on
a guest operating system. To exploit the vulnerability, an attacker could
run a specially crafted application on a guest operating system that could
cause the Hyper-V host operating system to execute arbitrary code. Customers
who have not enabled the Hyper-V role are not affected.

An attacker who successfully exploited the vulnerability could execute
arbitrary code on the host operating system. The security update addresses
the vulnerability by correcting how Hyper-V validates guest operating system
user input.

The following table contains links to the standard entry for each vulnerability
in the Common Vulnerabilities and Exposures list:

Vulnerability title                           CVE number      Publicly disclosed   Exploited
Hyper-V Remote Code Execution Vulnerability   CVE-2016-0088   No                   No

Multiple Hyper-V Information Disclosure Vulnerabilities

Information disclosure vulnerabilities exist when Windows Hyper-V on a host
operating system fails to properly validate input from an authenticated user
on a guest operating system. To exploit the vulnerabilities, an attacker
on a guest operating system could run a specially crafted application
that could cause the Hyper-V host operating system to disclose memory
information. Customers who have not enabled the Hyper-V role are not affected.
An attacker who successfully exploited the vulnerabilities could gain access
to information on the Hyper-V host operating system. The security update
addresses the vulnerabilities by correcting how Hyper-V validates guest
operating system user input.

The following table contains links to the standard entry for each vulnerability
in the Common Vulnerabilities and Exposures list:

Vulnerability title                            CVE number      Publicly disclosed   Exploited
Hyper-V Information Disclosure Vulnerability   CVE-2016-0089   No                   No
Hyper-V Information Disclosure Vulnerability   CVE-2016-0090   No                   No

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