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Microsoft Windows Active Directory SPN Collision Denial of Service

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Release Date:  2011-02-08    Views:  3,915

Secunia Advisory SA43215

Where:

From local network

Impact:

DoS

Solution Status:

Vendor Patch

CVE Reference(s):

Description


A vulnerability has been reported in Microsoft Windows, which can be exploited by malicious users to cause a DoS (Denial of Service).

The vulnerability is caused due to an error in Active Directory when handling SPN (Service Principal Name) update requests. This can be exploited to cause SPN collisions via specially crafted packets sent to the Active Directory server, causing services using SPN and configured to negotiate to downgrade to NTLM (NT LAN Manager) while services not configured to negotiate become unavailable.

Successful exploitation requires local Administrator privileges on a domain-joined computer.


Solution:
Apply patches.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Reported by the vendor.

Original Advisory:
MS11-005 (KB2478953):
http://www.microsoft.com/technet/security/Bulletin/MS11-005.mspx

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Microsoft Windows Active Directory SPN Collision Denial of Service

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