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17 April 2015

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             AUSCERT External Security Bulletin Redistribution

              Microsoft Security Bulletin MS15-034 - Critical
                               17 April 2015


        AusCERT Security Bulletin Summary

Product:           Microsoft Windows
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-1635  

Original Bulletin: 

Comment: AusCERT has received reports that active exploits exist for this 
         vulnerability and are being exploited to cause denial of service, 
         and possibly code execution. AusCERT recommends that administrators 
         patch affected systems as soon as possible.

Revision History:  April 17 2015: Reports of active exploitation
                   April 15 2015: Initial Release

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Microsoft Security Bulletin MS15-034 - Critical

Vulnerability in HTTP.sys Could Allow Remote Code Execution (3042553)

Published: April 14, 2015

Version: 1.0

Executive Summary

This security update resolves a vulnerability in Microsoft Windows. The 
vulnerability could allow remote code execution if an attacker sends a 
specially crafted HTTP request to an affected Windows system.

This security update is rated Critical for all supported editions of Windows 
7, Windows Server 2008 R2, Windows 8, Windows Server 2012, Windows 8.1, and 
Windows Server 2012 R2. For more information, see the Affected Software 

Affected Software

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 Server 2008 R2 for Itanium-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

Server Core installation option

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

HTTP.sys Remote Code Execution Vulnerability - CVE-2015-1635

A remote code execution vulnerability exists in the HTTP protocol stack 
(HTTP.sys) that is caused when HTTP.sys improperly parses specially crafted 
HTTP requests. An attacker who successfully exploited this vulnerability could
execute arbitrary code in the context of the System account.

To exploit this vulnerability, an attacker would have to send a specially 
crafted HTTP request to the affected system. The update addresses the 
vulnerability by modifying how the Windows HTTP stack handles requests.

Microsoft received information about this vulnerability through coordinated 
vulnerability disclosure. When this security bulletin was originally issued, 
Microsoft had not received any information to indicate that this vulnerability
had been publicly used to attack customers.

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