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AUSCERT External Security Bulletin Redistribution
ESB-2016.2676
Microsoft Security Bulletin MS16-138 - Important Security Update for
Microsoft Virtual Hard Disk Driver (3199647)
9 November 2016
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AusCERT Security Bulletin Summary
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Product: Microsoft Windows
Publisher: Microsoft
Operating System: Windows 8.1
Windows Server 2012
Windows Server 2012 R2
Windows 10
Windows Server 2016
Impact/Access: Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2016-7226 CVE-2016-7225 CVE-2016-7224
CVE-2016-7223
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS16-138
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Microsoft Security Bulletin MS16-138 - Important
Security Update for Microsoft Virtual Hard Disk Driver (3199647)
Published: November 8, 2016
Version: 1.0
Executive Summary
This security update resolves vulnerabilities in Microsoft Windows. The
Windows Virtual Hard Disk Driver improperly handles user access to certain
files. An attacker could manipulate files in locations not intended to be
available to the user by exploiting this vulnerability.
This security update is rated Important for of Windows 8.1, Windows Server
2012, Windows Server 2012 R2, Windows RT 8.1, Windows 10, and Windows
Server 2016.
Affected Software
Windows 8.1
Windows Server 2012 and Windows Server 2012 R2
Windows RT 8.1
Windows 10
Windows Server 2016
Vulnerability Information
Multiple VHD Driver Elevation of Privilege Vulnerabilities
Multiple elevation of privilege vulnerabilities exist when the Windows
Virtual Hard Disk Driver fails to properly handle user access to certain
files. An attacker who successfully exploited the vulnerabilities could
manipulate files in locations not intended to be available to the user.
To exploit the vulnerabilities, an attacker would need access to the
local system and the ability to execute a specially crafted application
on the system.
The security update addresses the vulnerabilities by correcting how the
kernel API restricts access to these files.
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
VHD Driver Elevation of Privilege Vulnerability CVE-2016-7223 No No
VHD Driver Elevation of Privilege Vulnerability CVE-2016-7224 No No
VHD Driver Elevation of Privilege Vulnerability CVE-2016-7225 No No
VHD Driver Elevation of Privilege Vulnerability CVE-2016-7226 No No
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