Operating System:

[Win]

Published:

09 November 2016

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.2673
        Microsoft Security Bulletin MS16-135 - Important: Security
             Update for Windows Kernel-Mode Drivers (3199135)
                              9 November 2016

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

Product:           Microsoft Windows
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Increased Privileges     -- Existing Account
                   Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-7255 CVE-2016-7246 CVE-2016-7218
                   CVE-2016-7215 CVE-2016-7214 

Original Bulletin: 
   https://technet.microsoft.com/en-us/library/security/MS16-135

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Microsoft Security Bulletin MS16-135 - Important: Security Update for Windows 
Kernel-Mode Drivers (3199135)

Severity: 		Important
KB Article: 		3199135
Version: 		1.0

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 that
could exploit the vulnerabilities and take control of an affected system.

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

Affected Software

Windows Vista
Windows Server 2008
Windows 7
Windows Server 2008 R2
Windows 8.1
Windows Server 2012 and Windows Server 2012 R2
Windows RT 8.1
Windows 10
Windows Server 2016

Vulnerability Information

Win32k Information Disclosure Vulnerability - CVE-2016-7214

An Information disclosure vulnerability exists in the Windows kernel that could
allow an attacker to retrieve information that could lead to a Kernel Address
Space Layout Randomization (ASLR) bypass. An attacker who successfully
exploited the vulnerability could retrieve the memory address of a kernel 
object.

To exploit the vulnerability, an attacker would have to log on to an affected
system and run a specially crafted application. The security update addresses 
the vulnerability by correcting how the Windows kernel handles memory 
addresses.

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 Information Disclosure Vulnerability	CVE-2016-7214	No			No

Win32k Elevation of Privilege Vulnerability

Multiple elevation of privilege vulnerabilities exists when the Windows 
kernel-mode driver fails to properly handle objects in memory. An attacker who 
successfully exploited the vulnerability 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
system. An attacker could then run a specially crafted application that could
exploit the vulnerabilities and take control of 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-2016-7215	No			No
Win32k Elevation of Privilege Vulnerability	CVE-2016-7246	No			No
Win32k Elevation of Privilege Vulnerability	CVE-2016-7255	Yes			Yes*

*Note for CVE-2016-7255: Microsoft implemented new exploit mitigations in the 
Windows 10 Anniversary Update version of the win32k kernel component. These
Windows 10 Anniversary Update mitigations, which were developed based on 
proactive internal research, stop all observed in-the-wild instances of this 
exploit.

Windows Bowser.sys Information Disclosure Vulnerability - CVE-2016-7218

An information disclosure vulnerability exists in Windows when the Windows 
bowser.sys kernel-mode driver fails to properly handle objects in memory. 
To exploit this vulnerability, an authenticated attacker would run a 
specially crafted application. The update addresses this vulnerability 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
Microsoft Browser Information Disclosure Vulnerability	CVE-2016-7218	No			No

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