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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
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Increased Privileges -- Console/Physical
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-3302  

Original Bulletin: 

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Microsoft Security Bulletin MS16-112: Important - Security Update for Windows
Lock Screen (3178469)

Executive Summary

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.

Affected Software

Windows 8.1

Windows Server 2012 R2

Windows RT 8.1

Windows 10

Windows Server 2012 R2 (Server Core installation)

Vulnerability Information

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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