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Microsoft is aware of PetitPotam which can potentially be used in an attack on Windows domain controllers or other Windows servers.
To prevent NTLM Relay Attacks on networks with NTLM enabled, domain administrators must ensure that services that permit NTLM authentication make use of protections such as Extended Protection for Authentication (EPA) or signing features such as SMB signing. PetitPotam takes advantage of servers where Active Directory Certificate Services (AD CS) is not configured with protections for NTLM Relay Attacks.
You are potentially vulnerable to this attack if you are using Active Directory Certificate Services (AD CS) with any of the following services:
- Certificate Authority Web Enrollment
- Certificate Enrollment Web Service
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