Remove From My Forums. Asked by:. Archived Forums. Windows Server General Forum. Sign in to vote. Did I miss something? Edited by jori5 Wednesday, July 25, AM.
Wednesday, July 25, AM. Hello Natip, I suggest you check configuration settings once again and check for the difference. SMB encryption is one of those settings. Not only must both client and server support SMB3 and be encryption enabled, but file share or server must explicitly enable encryption. What is the best way to see whether SMB encryption and other security features are working?
You guessed it, packet capture. Trying to determine accurate results from pen testing without a packet capture is like trying to discover life in the deep ocean by staring really hard at the ocean surface from a boat deck. So the next time you get back failed test for SMB on a pen test, remember to check those packets to make sure the test is accurate. You must be a registered user to add a comment.
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Microsoft Enterprise. Browse All Community Hubs. The following table lists the actual and effective default values for this policy. There are no differences in this security policy between Windows operating systems beginning with Windows Server Changes to this policy become effective without a computer restart when they are saved locally or distributed through Group Policy.
This section describes how an attacker might exploit a feature or its configuration, how to implement the countermeasure, and the possible negative consequences of countermeasure implementation. LM is an old protocol and very easily subverted. NTLM v2 adds several enhancements to v1 that make it much more secure. In LM authentication, the password is case-INsensitive, restricting each character to either a special character or one of the 26 letters.
Additionally, long passwords up to 14 characters are divided into 7-character chunks. The combination of a small character space and password division result in a very small overall key space. Dictionary attacks on passwords used in LM authentication are very fast case insensitive and even complete brute force attacks can succeed in relatively little time.
Recognizing this vulnerability, Microsoft introduced the NTLM protocol which simply adds case sensitivity and removes the password-division. Dictionary attacks on this protocol are still very good for weak passwords, but Microsoft claims that 2GHz machines would still take 5.
Fortunately for attackers unfortunately for you , the protocol does not offer any signing or encryption of the exchange of messages between the client and the server. Thus, the protocol is susceptible to message injection by an attacker, allowing "chosen plaintext" attacks.
This protocol expands the key space to bits, increasing the difficulty of exhaustive brute force attacks according to Microsoft. The secure channel is established using a key set created specifically for that purpose i.
Encryption can also effectively obscure the messages, preventing the offline cracking attempts that work so well against LM and NTLM authentication. While settings are obvious, the distinction between the last three is less clear. In all of them , machines will use only NTLMv2 to outgoing authentication. LM should never, ever, ever be allowed as authentication to or from a member server.
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