Why is NTLM not secure?
No Mutual Authentication Unlike Kerberos, when a client authenticates to an active directory server using NTLM, it cannot validate the identity of the server.
This means that a malicious actor with man-in-the-middle capabilities could send the client fake/malicious data while impersonating the server..
What port does NTLM use?
NT LAN Manager (NTLM) is the default authentication scheme used by the WinLogon process; it uses three ports between the client and domain controller (DC): UDP 137 – UDP 137 (NetBIOS Name) UDP 138 – UDP 138 (NetBIOS Netlogon and Browsing) 1024-65535/TCP – TCP 139 (NetBIOS Session)
What is the main difference between NTLM and net NTLMv2?
Net-NTLMv2 The authentication steps are the same, except for the challenge-response generation algorithm, and the NTLM challenge length which in this case is variable instead of the fixed 16-bytes number at Net-NTLMv1.
How does NTLM SSO work?
Username of the logged in user is send to the server. Server generated random number challenge and send it to the client. Client encrypts the challenge with the user password hash and send it back to server. Server sends username, challenge and challenge-response to DC.
What is NTLM used for?
Windows Challenge/Response (NTLM) is the authentication protocol used on networks that include systems running the Windows operating system and on stand-alone systems. The Microsoft Kerberos security package adds greater security than NTLM to systems on a network.
Is Ntlm still used?
Current applications. NTLM authentication is still supported and must be used for Windows authentication with systems configured as a member of a workgroup. NTLM authentication is also used for local logon authentication on non-domain controllers.
How do I know if NTLM is used?
To find applications that use NTLMv1, enable Logon Success Auditing on the domain controller, and then look for Success auditing Event 4624, which contains information about the version of NTLM.
Should I disable NTLM?
The main risk of disabling NTLM is the potential usage of legacy or incorrectly configured applications that can still use NTLM authentication.
Does LDAP use NTLM?
NTLM: Authentication is the well-known and loved challenge-response authentication mechanism, using NTLM means that you really have no special configuration issues. … It gets tricky because LDAP also includes an extensible authentication framework called SASL that allows alternate authentication protocols to be added.