Microsoft Windows: Multiple vulnerabilities

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.1496
        Microsoft Security Bulletin MS16-073 - Important: Security
             Update for Windows Kernel-Mode Drivers (3164028)
                               15 June 2016

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        AusCERT Security Bulletin Summary
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Product:           Microsoft Windows
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Administrator Compromise -- Existing Account
                   Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-3232 CVE-2016-3221 CVE-2016-3218

Original Bulletin: 
   https://technet.microsoft.com/en-us/library/security/MS16-073

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Microsoft Security Bulletin MS16-073 - Important: Security Update for Windows
Kernel-Mode Drivers (3164028)

Executive Summary

This security update resolves vulnerabilities in Microsoft Windows. The most 
severe of the vulnerabilities could allow elevation of privilege if an 
attacker logs on to an affected system and runs a specially crafted 
application.

This security update is rated Important for all supported releases of 
Microsoft Windows. For more information, see the Affected Software and 
Vulnerability Severity Ratings section.

The security update addresses the vulnerabilities by correcting how the 
Windows kernel-mode driver handles objects in memory, and by correcting VPCI 
memory handling.

Affected Software

Operating System

Windows Vista

Windows Server 2008

Windows 7

Windows Server 2008 R2

Windows 8.1

Windows Server 2012

Windows Server 2012 R2

Windows RT 8.1

Windows 10

Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core 
installation)

Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core 
installation)

Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core 
installation)

Windows Server 2012 (Server Core installation)

Windows Server 2012 R2 (Server Core installation)

Vulnerability Information

Multiple Win32k Elevation of Privilege Vulnerabilities

Multiple elevation of privilege vulnerabilities exist in Windows when the 
Windows kernel-mode driver fails to properly handle objects in memory. An 
attacker who successfully exploited the vulnerabilities could run arbitrary 
code in kernel mode. An attacker could then install programs; view, change, or
delete data; or create new accounts with full user rights.

To exploit the vulnerabilities, an attacker would first have to log on to the
target system. An attacker could then run a specially crafted application that
could exploit the vulnerabilities and take control over an affected system. 
The update addresses the vulnerabilities by correcting how the Windows 
kernel-mode driver handles objects in memory.

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

Win32k Elevation of Privilege Vulnerability 	CVE-2016-3218 	No 			No

Win32k Elevation of Privilege Vulnerability 	CVE-2016-3221 	No 			No

Windows Virtual PCI Information Disclosure Vulnerability - CVE-2016-3232

An information disclosure vulnerability exists when the Windows Virtual PCI 
(VPCI) virtual service provider (VSP) fails to properly handle uninitialized 
memory. An attacker who successfully exploited this vulnerability could 
potentially disclose contents of memory to which they should not have access.

To exploit the vulnerability, an attacker would first have to log on to the 
target system. An attacker could then run a specially crafted application that
could exploit the vulnerability. The vulnerability would not allow an attacker
to execute code or to elevate user rights directly, but it could be used to 
obtain information that could be used to try to further compromise the 
affected system. The update addresses the vulnerability by correcting VPCI 
memory handling.

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

Windows Virtual PCI Information Disclosure Vulnerability 	CVE-2016-3232 	No 			No

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