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AUSCERT External Security Bulletin Redistribution
ESB-2016.1500
Microsoft Security Bulletin MS16-077: Security Update for WPAD (3165191)
15 June 2016
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AusCERT Security Bulletin Summary
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Product: Microsoft Windows
Publisher: Microsoft
Operating System: Windows
Impact/Access: Increased Privileges -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-3236 CVE-2016-3213
Reference: ESB-2016.1490
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS16-077
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Microsoft Security Bulletin MS16-077: Security Update for WPAD (3165191)
Executive Summary
This security update resolves vulnerabilities in Microsoft Windows. The
vulnerabilities could allow elevation of privilege if the Web Proxy Auto
Discovery (WPAD) protocol falls back to a vulnerable proxy discovery process
on a target system.
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
Windows WPAD Elevation of Privilege Vulnerability - CVE-2016-3213
An elevation of privilege vulnerability exists in Microsoft Windows when the
Web Proxy Auto Discovery (WPAD) protocol falls back to a vulnerable proxy
discovery process. An attacker who successfully exploited this vulnerability
could bypass security and gain elevated privileges on a targeted system.
To exploit the vulnerability, an attacker could respond to NetBIOS name
requests for WPAD. The update addresses the vulnerability by correcting how
Windows handles proxy discovery.
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 WPAD Elevation of Privilege Vulnerability CVE-2016-3213 No No
Windows WPAD Proxy Discovery Elevation of Privilege Vulnerability -
CVE-2016-3236
An elevation of privilege vulnerability exists when Microsoft Windows
improperly handles certain proxy discovery scenarios using the Web Proxy Auto
Discovery (WPAD) protocol method. An attacker who successfully exploited the
vulnerability could potentially access and control network traffic for which
the attacker does not have sufficient privileges. The update addresses the
vulnerability by correcting WPAD automatic proxy detection in Windows.
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 WPAD Proxy Discovery Elevation of Privilege Vulnerability CVE-2016-3236 Yes No
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