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AUSCERT External Security Bulletin Redistribution
ESB-2016.1495
Microsoft Security Bulletin MS16-072: Security Update for
Group Policy (3163622)
15 June 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Windows
Publisher: Microsoft
Operating System: Windows
Impact/Access: Administrator Compromise -- Existing Account
Provide Misleading Information -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2016-3223
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS16-072
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Microsoft Security Bulletin MS16-072: Security Update for Group Policy
(3163622)
Executive Summary
This security update resolves a vulnerability in Microsoft Windows. The
vulnerability could allow elevation of privilege if an attacker launches a
man-in-the-middle (MiTM) attack against the traffic passing between a domain
controller and the target machine.
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 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
Group Policy Elevation of Privilege Vulnerability - CVE-2016-3223
An elevation of privilege vulnerability exists when Microsoft Windows
processes group policy updates. An attacker who successfully exploited this
vulnerability could potentially escalate permissions or perform additional
privileged actions on the target machine.
To exploit this vulnerability, an attacker would need to launch a
man-in-the-middle (MiTM) attack against the traffic passing between a domain
controller and the target machine. An attacker could then create a group
policy to grant administrator rights to a standard user. The security update
addresses the vulnerability by enforcing Kerberos authentication for certain
calls over LDAP.
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
Group Policy Elevation of Privilege Vulnerability CVE-2016-3223 No No
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