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Here is a quick command line to create a null session: net use \\IP_ADDRESS\ipc$ "" /user:"" And if it’s not, someone may have done something very bad to your Windows installation.One of the technologies I have worked with the most during my time at Microsoft is SMB. Why? What is the best way to see whether SMB encryption and other security features are working?
The IP address or hostname of the system to which you want to map a null connection. It is a type of communication in which the function focuses mainly on supplying foundation of network file as well as print sharing services.One can generate a null session with the use of a Windows Net program in order to perform connection mapping while utilizing a blank name and password. Specifically, the Session Setup part, where authentication happens.Session Setup Request, NTLMSSP_AUTH, User: CONTOSO\RedUserYou will note that RedWrk sent the CONTOSO\RedUser account, even though we didn’t explicitly set that credential. IPC$ functionality has been around for ages and default access rules to IPC$ has changed with each release of Windows.
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The computer object ($) is a valid authentication object in AD and can be used to authenticate to Windows and an SMB share. No centralized authentication method means that each workgroup member must rely on their local security database, which does not contain details about the other workgroup member(s) unless those details are explicitly added. It’s like clicking the “Connect using different credentials” checkbox when mapping a drive with File Explorer, or /user with “net use”. This means that all anonymous and implicit authentication methods will fail.RedWrk and BlueWrk were joined to the domain for the next step. You guessed it, packet capture.Trying to determine accurate results from pen testing without a packet capture is like trying to discover life in the deep ocean by staring really hard at the ocean surface from a boat deck. “That’s a null session!”Remember when I said Windows really wants to make that connection work? This first command explicitly sets a NULL user (/user:) and password ("")The second command sets no explicit credentials. It is possible to log into it using a NULL session (i.e., with no login or password). NULL session does not establish a unique session key for each authentication; and thus, it cannot provide integrity or confidentiality protection. Based on studies, the attacker will just have to basically enter “net use ” and “/user:” at the command prompt in order to easily gain access into the system.There are other applications an invader may use in their attack setup when he is launching his plans and these are the Winfo, Walksam, and some sorts of Windows Resource Kit tools. The attacker can utilize the vulnerability in the null session in order to connect to an unprotected inter process communication (IPC$) share of the Windows system even from afar or over the web. Yep, they are still about.
This can happen when an IP address is used instead of a hostname or FQDN (Fully Qualified Domain Name).Same story as the previous command.
The 20-year-old null session bug still isn’t fixed!Fine, let me prove it to you.
Not only must both client and server support SMB3 and be encryption enabled, but file share or server must explicitly enable encryption.