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Category:   Application (Directory)  >   Microsoft Active Directory Vendors:   Microsoft
Microsoft Active Directory SPN Collosions May Let Remote Authenticated Users Deny Service
SecurityTracker Alert ID:  1025042
SecurityTracker URL:  http://securitytracker.com/id/1025042
CVE Reference:   CVE-2011-0040   (Links to External Site)
Date:  Feb 9 2011
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Microsoft Active Directory. A remote authenticated user can cause denial of service conditions.

The system does not properly validate service principal name (SPN) values. A remote authenticated user can send specially crafted data to cause the target system to downgrade from Kerberos to NT LAN Manager (NTLM) and potentially cause the service to stop responding.

Impact:   A remote authenticated user can cause denial of service conditions on the target system.
Solution:   The vendor has issued the following fixes:

Windows Server 2003 Service Pack 2, Active Directory:

http://www.microsoft.com/downloads/details.aspx?familyid=651C1F4F-4E69-4D17-8AA2-72681DFC5463

Windows Server 2003 x64 Edition Service Pack 2, Active Directory:

http://www.microsoft.com/downloads/details.aspx?familyid=EC962B0E-E951-4E70-8D97-8C2AFD360C28

Windows Server 2003 with SP2 for Itanium-based Systems, Active Directory:

http://www.microsoft.com/downloads/details.aspx?familyid=4AC66EAE-E6D8-4E8B-B4EA-E7A77CC74DB0

A restart is required.

The Microsoft advisory is available at:

http://www.microsoft.com/technet/security/bulletin/ms11-005.mspx

Vendor URL:  www.microsoft.com/technet/security/bulletin/ms11-005.mspx (Links to External Site)
Cause:   State error
Underlying OS:  Windows (2003)
Underlying OS Comments:  2003 SP2

Message History:   None.


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