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                                    CERT-Renater

                         Note d'Information No. 2011/VULN321
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DATE                      : 13/04/2011

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Windows version XP, 2003, Vista, 2008, 7 running Windows DNS resolver.

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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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