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             AUSCERT External Security Bulletin Redistribution

                              ESB-2016.0611.2
Microsoft Security Bulletin MS16-035: Security Update for .NET Framework to
                 Address Security Feature Bypass (3141780)
                               9 March 2016

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Microsoft .NET Framework
Publisher:         Microsoft
Operating System:  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
Impact/Access:     Modify Arbitrary Files -- Remote/Unauthenticated
                   Reduced Security       -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-0132  

Original Bulletin: 
   https://technet.microsoft.com/en-us/library/security/MS16-035

Revision History:  March 9 2016: Update Impacts and access vectors for 
				 CVE-2016-0132
                   March 8 2016: Initial Release

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Microsoft Security Bulletin MS16-035: Security Update for .NET Framework to 
Address Security Feature Bypass (3141780)

Bulletin Number: MS16-035

Bulletin Title: Security Update for .NET Framework to Address Security Feature
Bypass

Severity: Important

KB Article: 3141780

Version: 1.0

Published Date: March 8, 2016

Executive Summary

This security update resolves a vulnerability in the Microsoft .NET Framework.
The security feature bypass exists in a .NET Framework component that does not
properly validate certain elements of a signed XML document.

This security update is rated Important for Microsoft .NET Framework 2.0 
Service Pack 2, Microsoft .NET Framework 3.0 Service Pack 2, Microsoft .NET 
Framework 3.5, Microsoft .NET Framework 3.5.1, Microsoft .NET Framework 4.5.2,
Microsoft .NET Framework 4.6, and Microsoft .NET Framework 4.6.1 on affected 
releases of Microsoft Windows.

Affected Software

Microsoft .NET Framework 2.0 Service Pack 2

Microsoft .NET Framework 3.0 Service Pack 2

Microsoft .NET Framework 3.5

Microsoft .NET Framework 3.5.1

Microsoft .NET Framework 4.5.2[1]

Microsoft .NET Framework 4.6 [1]

Microsoft .NET Framework 4.6.1

Windows Vista Service Pack 2

Windows Vista x64 Edition Service Pack 2

Windows Server 2008 for 32-bit Systems Service Pack 2

Windows Server 2008 for x64-based Systems Service Pack 2

Windows Server 2008 for Itanium-based Systems Service Pack 2

Windows 7 for 32-bit Systems Service Pack 1

Windows 7 for x64-based Systems Service Pack 1

Windows Server 2008 R2 for x64-based Systems Service Pack 1

Windows Server 2008 R2 for Itanium-based Systems Service Pack 1

Windows 8.1 for 32-bit Systems

Windows 8.1 for x64-based Systems

Windows Server 2012

Windows Server 2012 R2

Windows RT 8.1

Windows 10 for 32-bit Systems[3] (3140745)

Windows 10 for x64-based Systems[3] (3140745)

Windows 10 Version 1511 for 32-bit Systems[3] (3140768)

Windows 10 Version 1511 for x64-based Systems[3] (3140768)

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)

[1]For information about changes in support for .NET Framework 4.x, see 
Internet Explorer and .NET Framework 4.x Support Announcements.

[2]Windows RT 8.1 updates are available only via Windows Update.

[3]Windows 10 updates are cumulative. In addition to containing non-security 
updates, they also contain all of the security fixes for all of the Windows 
10-affected vulnerabilities shipping with the monthly security release. The 
updates are available via the Microsoft Update Catalog.

Vulnerability Information

.NET XML Validation Security Feature Bypass - CVE-2016-0132

A security feature bypass vulnerability exists in a .NET Framework component 
that does not properly validate certain elements of a signed XML document. An
attacker who successfully exploited the vulnerability could modify the 
contents of an XML file without invalidating the signature associated with the
file. If a .NET application relies on the signature to be non-malicious, the 
behavior of the application could become unpredictable. In custom 
applications, the security impact depends on the specific usage scenario.

In a .NET application attack scenario, an attacker could modify the contents 
of an XML file without invalidating the signature associated with the file. 
The update addresses the vulnerability by correcting how the .NET Framework 
validates XML documents.

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

.NET XML Validation Security Feature Bypass 	CVE-2016-0132	No 			No

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