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             AUSCERT External Security Bulletin Redistribution

                               ESB-2011.0419
Vulnerability in DNS Resolution Could Allow Remote Code Execution (2509553)
                               13 April 2011

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

Product:           Microsoft Windows
Publisher:         Microsoft
Operating System:  Windows XP
                   Windows Server 2003
                   Windows Vista
                   Windows Server 2008
                   Windows 7
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2011-0657  

Original Bulletin: 
   http://www.microsoft.com/technet/security/Bulletin/MS11-030.mspx

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Microsoft Security Bulletin MS11-030 - Critical
Vulnerability in DNS Resolution Could Allow Remote Code Execution (2509553)
Version: 1.0

General Information

Executive Summary

This security update resolves a privately reported vulnerability in Windows 
DNS resolution. The vulnerability could allow remote code execution if an 
attacker gained access to the network and then created a custom program to send 
specially crafted LLMNR broadcast queries to the target systems. Firewall best 
practices and standard default firewall configurations can help protect 
networks from attacks that originate outside the enterprise perimeter. Best 
practices recommend that systems that are connected to the Internet have a 
minimal number of ports exposed. In this case, the LLMNR ports should be blocked 
from the Internet.

This security update is rated Critical for all supported editions of Windows 
Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2. The security 
update is rate Important for all supported editions of Windows XP and Windows 
Server 2003. For more information, see the subsection, Affected and 
Non-Affected Software, in this section.

Affected Software 

Windows XP Service Pack 3
Windows XP Professional x64 Edition Service Pack 2
Windows Server 2003 Service Pack 2
Windows Server 2003 x64 Edition Service Pack 2
Windows Server 2003 with SP2 for Itanium-based Systems
Windows Vista Service Pack 1 and Windows Vista Service Pack 2
Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition 
  Service Pack 2
Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit 
  Systems Service Pack 2*
Windows Server 2008 for x64-based Systems and Windows Server 2008 for 
  x64-based Systems Service Pack 2*
Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for 
  Itanium-based Systems Service Pack 2
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 affected. This update applies, with the same 
severity rating, to supported editions of Windows Server 2008 or Windows 
Server 2008 R2 as indicated, whether or not installed using the Server Core 
installation option. 

Vulnerability Information

DNS Query Vulnerability - CVE-2011-0657

A remote code execution vulnerability exists in the way that the DNS client 
service handles specially crafted LLMNR queries. An attacker who 
successfully exploited this vulnerability could run arbitrary code in the 
context of the NetworkService account. An attacker could then install 
programs; view, change, or delete data; or create new accounts with full 
user rights.

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The University of Queensland
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