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MS05-042: Vulnerabilities in Kerberos could allow denial of service, information disclosure, and spoofing

Support for Windows XP has ended

Microsoft ended support for Windows XP on April 8, 2014. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

Support for Windows Server 2003 ended on July 14, 2015

Microsoft ended support for Windows Server 2003 on July 14, 2015. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

Microsoft has released security bulletin MS05-042. The security bulletin contains all the relevant information about the security update. This information includes file manifest information and deployment options. To view the complete security bulletin, visit one of the following Microsoft Web sites: For more information about the latest service pack for Windows Server 2003, click the following article number to view the article in the Microsoft Knowledge Base:
889100 How to obtain the latest service pack for Windows Server 2003
Note The security update contains some security-related changes to functionality. Besides the changes that are listed in each "Vulnerability Details" section of Security Bulletin MS05-042, the security update includes another change in functionality. An optional, but recommended, registry entry (RequireAsChecksum) has been added to help provide additional protection for potential future PKINIT-related vulnerabilities. PKINIT is an Internet Engineering Task Force (IETF) Internet Draft for "Public Key Cryptography for Initial Authentication in Kerberos." For more information, click the following article number to view the article in the Microsoft Knowledge Base:
904766 How to modify the RequireAsChecksum registry entry after you install security update 899587
update security_patch security_update security bug flaw vulnerability malicious attacker exploit registry unauthenticated buffer overrun overflow specially-formed scope specially-crafted denial of service DoS TSE WinNT Win2000
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Article ID: 899587 - Last Review: 09/30/2011 04:37:00 - Revision: 3.0

  • Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
  • Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
  • Microsoft Windows Server 2003, Standard Edition (32-bit x86)
  • Microsoft Windows Server 2003, Web Edition
  • Microsoft Windows Small Business Server 2003 Standard Edition
  • Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems
  • Microsoft Windows Server 2003, Datacenter Edition for Itanium-Based Systems
  • Microsoft Windows Server 2003 Service Pack 1
  • Microsoft Windows Server 2003, Standard x64 Edition
  • Microsoft Windows Server 2003, Enterprise x64 Edition
  • Microsoft Windows Server 2003, Datacenter x64 Edition
  • Microsoft Windows XP Tablet PC Edition
  • Microsoft Windows XP Media Center Edition 2005 Update Rollup 2
  • Microsoft Windows XP Media Center Edition 2005
  • Microsoft Windows XP Professional x64 Edition
  • Microsoft Small Business Server 2000 Standard Edition
  • kbwinserv2003sp2fix kbhotfixserver kbqfe kbsecurity kbsecbulletin kbsecvulnerability kbwinxppresp2fix kbbug kbfix kbwinserv2003presp1fix kbwin2000presp5fix kbwinnt400presp7fix KB899587
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