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             AUSCERT External Security Bulletin Redistribution

         Microsoft Security Bulletin MS16-065 - Important Security
                    Update for .NET Framework (3156757)
                                11 May 2016


        AusCERT Security Bulletin Summary

Product:           Microsoft .NET Framework
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Access Privileged Data         -- Remote with User Interaction
                   Provide Misleading Information -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-0149  

Original Bulletin: 

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Microsoft Security Bulletin MS16-065 - Important Security Update for .NET 
Framework (3156757)

Published: May 10, 2016

Version: 1.0

Executive Summary

This security update resolves a vulnerability in Microsoft .NET Framework. The
vulnerability could cause information disclosure if an attacker injects 
unencrypted data into the target secure channel and then performs a 
man-in-the-middle (MiTM) attack between the targeted client and a legitimate 

This security update is rated Important for Microsoft .NET Framework 2.0 
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

Windows Vista
Windows Server 2008
Windows 7
Windows Server 2008 R2
Windows 8.1
Windows Server 2012 and Windows Server 2012 R2
Windows RT 8.1
Windows 10

Vulnerability Information

TLS/SSL Information Disclosure Vulnerability - CVE-2016-0149

An information disclosure vulnerability exists in the TLS/SSL protocol, 
implemented in the encryption component of Microsoft .NET Framework. An 
attacker who successfully exploited this vulnerability could decrypt encrypted
SSL/TLS traffic.

To exploit the vulnerability, an attacker would first have to inject 
unencrypted data into the secure channel and then perform a man-in-the-middle
(MiTM) attack between the targeted client and a legitimate server. The update
addresses the vulnerability by modifying the way that the .NET encryption 
component sends and receives encrypted network packets.

Important Microsoft recommends that customers download and test the applicable
update in controlled/managed environments before deploying it in their 
production environments.

In case of application compatibility issues, the recommended approach is to 
ensure that the server and client endpoints are correctly implementing the TLS
RFC, and that they can interpret two split records containing 1, n-1 bytes 
respectively after this update. For more information and developer guidance, 
see Microsoft Knowledge Base Article 3155464.

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

TLS/SSL Information Disclosure Vulnerability	CVE-2016-0149	Yes			No

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