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             AUSCERT External Security Bulletin Redistribution

     Vulnerability in Kerberos Could Allow Denial of Service (2743555)
                              10 October 2012


        AusCERT Security Bulletin Summary

Product:           Microsoft Windows
Publisher:         Microsoft
Operating System:  Windows 7
                   Windows Server 2008
                   Windows Server 2008 R2
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2012-2551  

Original Bulletin: 

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Microsoft Security Bulletin MS12-069 - Important
Vulnerability in Kerberos Could Allow Denial of Service (2743555)

Published Date: October 9, 2012

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 remote attacker
sends a specially crafted session request to the Kerberos server. 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.

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

Affected Software

Windows 7 for 32-bit Systems
Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems
Windows 7 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for Itanium-based Systems
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems (Server Core installation)
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core

Vulnerability Information

Kerberos NULL Dereference Vulnerability - CVE-2012-2551

A denial of service vulnerability exists when the Microsoft Kerberos
implementation fails to properly handle a specially crafted session. An
attacker who successfully exploited this vulnerability could cause the system
to stop responding and restart.

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