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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.2076
  Microsoft Security Bulletin MS15-092: Vulnerabilities in .NET Framework
               Could Allow Elevation of Privilege (3086251)
                              12 August 2015

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

Product:           Microsoft .NET Framework
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Increased Privileges -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-2481 CVE-2015-2480 CVE-2015-2479

Original Bulletin: 
   https://technet.microsoft.com/en-us/library/security/MS15-092

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Microsoft Security Bulletin MS15-092: Vulnerabilities in .NET Framework Could
Allow Elevation of Privilege (3086251)

Bulletin Number: MS15-092

Bulletin Title: Vulnerabilities in .NET Framework Could Allow Elevation of 
Privilege

Severity: Important

KB Article: 3086251

Version: 1.0

Published Date: August 11, 2015

Executive Summary

This security update resolves vulnerabilities in Microsoft .NET Framework. The
vulnerabilities could allow elevation of privilege if a user runs a specially
crafted .NET application. However, in all cases, an attacker would have no way
to force users to run the application; an attacker would have to convince 
users to do so.

This security update is rated Important for Microsoft .NET Framework 4.6 on 
all supported releases of Microsoft Windows except Itanium editions. For more
information, see the Affected Software section.

Affected Software

Windows Vista

Windows Vista Service Pack 2

Windows Vista x64 Edition Service Pack 2

Windows Server 2008

Windows Server 2008 for 32-bit Systems Service Pack 2

Windows Server 2008 for x64-based Systems Service Pack 2

Windows 7

Windows 7 for 32-bit Systems Service Pack 1

Windows 7 for x64-based Systems Service Pack 1

Windows Server 2008 R2

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

Windows 8 and Windows 8.1

Windows 8 for 32-bit Systems

Windows 8 for x64-based Systems

Windows 8.1 for 32-bit Systems

Windows 8.1 for x64-based Systems

Windows Server 2012 and Windows Server 2012 R2

Windows Server 2012

Windows Server 2012 R2

Windows RT and Windows RT 8.1

Windows RT[1]

Windows RT 8.1[1]

Windows 10

Windows 10 for 32-bit Systems[2]

Windows 10 for x64-based Systems[2]

Server Core installation option

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)

[1]The security updates for Windows RT operating systems are available via 
Windows Update only.

[2]The Windows 10 update is cumulative. In addition to containing non-security
updates, it also contains all of the security fixes for all of the Windows 
10-affected vulnerabilities shipping with this months security release. The 
update is available via the Windows Update Catalog only. See Microsoft 
Knowledge Base Article 3081435 for more information and download links.

Vulnerability Information

Multiple RyuJIT Optimization Elevation of Privilege Vulnerabilities

Elevation of privilege vulnerabilities exist in Microsoft .NET Framework when
the RyuJIT compiler improperly optimizes certain parameters resulting in a 
code generation error. An attacker who successfully exploited this 
vulnerability could take complete control of an affected system. An attacker 
could then install programs; view, change, or delete data; or create new 
accounts with full user rights. Users whose accounts are configured to have 
fewer user rights on the system could be less impacted than users who operate
with administrative user rights.

To exploit these vulnerabilities, an attacker would need to host a specially 
crafted .NET application and convince users to run the application. However, 
in all cases, an attacker would have no way to force users to run the 
application; an attacker would have to convince users to do so. The security 
update addresses the vulnerabilities by correcting RyuJIT compiler 
optimization for .NET Framework.

The following tables contain links to the standard entry for each 
vulnerability in the Common Vulnerabilities and Exposures list:

Vulnerability Title 		CVE Number 	Publicly Disclosed 	Exploited

RyuJIT Optimization Elevation 	 CVE-2015-2479	No 			No
 of Privilege Vulnerability

RyuJIT Optimization Elevation 	CVE-2015-2480	No 			No
 of Privilege Vulnerability 

RyuJIT Optimization Elevation 	CVE-2015-2481	No 			No
 of Privilege Vulnerability

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