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.
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Subject: Microsoft Windows Active Directory SPN Collision Denial of Service
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