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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.2145
         Microsoft Security Bulletin MS16-111: Security Update for
                         Windows Kernel (3186973)
                             14 September 2016

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

Product:           Microsoft Windows
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Administrator Compromise -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-3373 CVE-2016-3372 CVE-2016-3371
                   CVE-2016-3306 CVE-2016-3305 

Original Bulletin: 
   https://technet.microsoft.com/en-us/library/security/MS16-111

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Microsoft Security Bulletin MS16-111: Security Update for Windows Kernel 
(3186973)

Executive Summary

This security update resolves vulnerabilities in Microsoft Windows. The 
vulnerabilities could allow elevation of privilege if an attacker runs a 
specially crafted application on a target system.

This security update is rated Important for all supported releases of 
Microsoft Windows.

Affected Software

Windows Vista

Windows Server 2008

Windows 7

Windows Server 2008 R2

Windows 8.1

Windows Server 2012

Windows Server 2012 R2

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 Windows Session Object Elevation of Privilege Vulnerabilities

Multiple Windows session object elevation of privilege vulnerabilities exist 
in the way that Windows handles session objects. A locally authenticated 
attacker who successfully exploited the vulnerabilities could hijack the 
session of another user.

To exploit the vulnerabilities the attacker could run a specially crafted 
application.

The update corrects how Windows handles session objects to prevent user 
session hijacking.

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 Session Object Elevation of Privilege Vulnerability 	CVE-2016-3305 	No 			No

Windows Session Object Elevation of Privilege Vulnerability 	CVE-2016-3306 	No 			No

Windows Kernel Elevation of Privilege Vulnerability - CVE-2016-3371

An elevation of privilege vulnerability exists in the way that the Windows 
Kernel API enforces permissions. An attacker who successfully exploited the 
vulnerability could gain access to information that is not intended for the 
user.

To exploit the vulnerability a locally-authenticated attacker could run a 
specially crafted application.

The security update addresses the vulnerability by helping to ensure that the
Windows Kernel API properly enforces permissions.

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 Kernel Elevation of Privilege Vulnerability 	CVE-2016-3371 	No 			No

Windows Kernel Elevation of Privilege Vulnerability - CVE-2016-3372

An elevation of privilege vulnerability exists in the way that the Windows 
Kernel API enforces permissions. An attacker who successfully exploited the 
vulnerability could impersonate processes, interject cross-process 
communication, or interrupt system functionality.

To exploit the vulnerability a locally-authenticated attacker could run a 
specially crafted application.

The security update addresses the vulnerability by helping to ensure that the
Windows Kernel API properly enforces permissions.

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 Kernel Elevation of Privilege Vulnerability 	CVE-2016-3372 	No 			No

Windows Kernel Elevation of Privilege Vulnerability - CVE-2016-3373

An elevation of privilege vulnerability exists when the Windows Kernel API 
improperly allows a user to access sensitive registry information. An attacker
who successfully exploited the vulnerability could gain access to user account
information that is not intended for the user.

A locally-authenticated attacker could exploit this vulnerability by running a
specially crafted application.

The security update addresses the vulnerability by helping to ensure that the
Windows Kernel API correctly restricts access to user account information.

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 Kernel Elevation of Privilege Vulnerability 	CVE-2016-3373 	No 			No

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