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AUSCERT External Security Bulletin Redistribution
Microsoft Security Bulletin MS16-112: Important - Security
Update for Windows Lock Screen (3178469)
14 September 2016
AusCERT Security Bulletin Summary
Product: Microsoft Windows
Operating System: Windows
Impact/Access: Increased Privileges -- Console/Physical
CVE Names: CVE-2016-3302
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Microsoft Security Bulletin MS16-112: Important - Security Update for Windows
Lock Screen (3178469)
This security update resolves a vulnerability in Microsoft Windows. The
vulnerability could allow elevation of privilege if Windows improperly allows
web content to load from the Windows lock screen.
This security update is rated Important for all supported editions of Windows
8.1, Windows RT 8.1, Windows Server 2012 R2, and Windows 10.
Windows Server 2012 R2
Windows RT 8.1
Windows Server 2012 R2 (Server Core installation)
Windows Lock Screen Elevation of Privilege Vulnerability - CVE-2016-3302
An elevation of privilege vulnerability exists when Windows improperly allows
web content to load from the Windows lock screen. To exploit the
vulnerability, an attacker with physical access to a users computer could
either connect to a maliciously configured WiFi hotspot or insert a mobile
broadband adaptor in the users computer. An attacker who successfully
exploited the vulnerability could potentially execute code on a user's locked
However, the attacker would have no way to either force a user to connect to
the hotspot or control the default browser selection on the users computer.
The security update addresses the vulnerability by correcting the behavior of
the Windows lock screen to prevent unintended web content from loading.
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 Lock Screen Elevation of Privilege Vulnerability CVE-2016-3302 No No
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