312-50V9 · Question #587
In the context of Windows Security, what is a 'null' user?
The correct answer is C. A pseudo account that has no username and password. A null user in Windows represents an anonymous connection established with no username or password, exploiting the null session capability of SMB/NetBIOS.
Question
In the context of Windows Security, what is a 'null' user?
Options
- AA user that has no skills
- BAn account that has been suspended by the admin
- CA pseudo account that has no username and password
- DA pseudo account that was created for security administration purpose
How the community answered
(26 responses)- A4% (1)
- B4% (1)
- C92% (24)
Why each option
A null user in Windows represents an anonymous connection established with no username or password, exploiting the null session capability of SMB/NetBIOS.
User skill level is a personnel concept unrelated to Windows security account definitions or authentication mechanisms.
A suspended or disabled account still has associated credentials; it is simply blocked from logging in, which is entirely different from an anonymous pseudo-account.
A null session is an unauthenticated connection to a Windows share using empty string credentials (no username, no password). Attackers can use null sessions to enumerate users, groups, shares, and other system information via NetBIOS and SMB on older or misconfigured Windows systems, making it a significant information disclosure risk.
Null sessions are not created for administrative purposes - they are an inherent Windows networking feature that attackers exploit for anonymous enumeration, not a sanctioned administrative tool.
Concept tested: Windows null session anonymous access vulnerability
Source: https://learn.microsoft.com/en-us/windows/security/threat-protection/security-policy-settings/network-access-restrict-anonymous-access-to-named-pipes-and-shares
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