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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
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
CVE Names: CVE-2015-1635
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
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
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)
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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