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             AUSCERT External Security Bulletin Redistribution

         Vulnerability in Windows Kernel-Mode Drivers Could Allow
                        Denial of Service (2617657)
                              9 November 2011


        AusCERT Security Bulletin Summary

Product:           Microsoft Windows
Publisher:         Microsoft
Operating System:  Windows 7
                   Windows Server 2008 R2
Impact/Access:     Denial of Service -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2011-2004  

Original Bulletin: 

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Microsoft Security Bulletin MS11-084 - Moderate
Vulnerability in Windows Kernel-Mode Drivers Could Allow Denial of Service 

Published: Tuesday, November 08, 2011

Version: 1.0

General Information

Executive Summary

This security update resolves a privately reported vulnerability in Microsoft 
Windows. The vulnerability could allow denial of service if a user opens a 
specially crafted TrueType font file as an e-mail attachment or navigates to a 
network share or WebDAV location containing a specially crafted TrueType font 
file. For an attack to be successful, a user must visit the untrusted remote 
file system location or WebDAV share containing the specially crafted TrueType 
font file, or open the file as an e-mail attachment. In all cases, however, an 
attacker would have no way to force users to perform these actions. Instead, an 
attacker would have to persuade users to do so, typically by getting them to 
click a link in an e-mail message or Instant Messenger message.

This security update is rated Moderate for all supported editions of Windows 7 
and Windows 2008 R2. For more information, see the subsection, Affected and 
Non-Affected Software, in this section.

Affected Software

Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems and Windows 7 for x64-based Systems 
  Service Pack 1
Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for 
  x64-based Systems Service Pack 1***
Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2 
  for Itanium-based Systems Service Pack 1

***Server Core installation not affected. The vulnerability addressed by this 
update does not affect supported editions of Windows Server 2008 or Windows 
Server 2008 R2 as indicated, when installed using the Server Core installation 
option, even though files affected by this vulnerability may be present on the 
system. However, users with the affected files will still be offered this update 
because the update files are newer (with higher version numbers) than the files 
that are currently on your system.

Vulnerability Information

TrueType Font Parsing Vulnerability - CVE-2011-2004

A denial of service vulnerability exists in the Microsoft Windows kernel. This 
vulnerability is caused when the Windows kernel improperly processes a 
specifically crafted TrueType font file. An attacker who successfully exploited 
this vulnerability could cause the affected system to stop responding and 

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