Network Access: Must prevent NTLM from falling back to a Null session

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Network Access: Must prevent NTLM from falling back to a Null session

793452ad-d37f-461b-a270-cc4e0ea1c2a5

NTLM sessions that are allowed to fall back to Null (unauthenticated) sessions may gain unauthorized access.

Remediation

To fix this configure the policy value for
Computer Configuration
|_ Windows Settings
|_ Security Settings
|_ Local Policies
|_ Security Options
|_ Network security: Allow LocalSystem NULL session fallback to "Disabled".

STIG
Server
2022: https://stigviewer.com/stigs/microsoft_windows_server_2022/2022-08-25/finding/V-254471
2019: https://stigviewer.com/stigs/microsoft_windows_server_2019/2022-03-01/finding/V-205917

Desktop:
W11: https://stigviewer.com/stigs/microsoft_windows_11/2022-06-24/finding/V-253458
W10: https://stigviewer.com/stigs/microsoft_windows_10/2022-04-08/finding/V-220934

Nist 800-53: AC-6(10)
Nist 800-171A: 3.1.7[a], 3.1.7[b], 3.1.7[c], 3.1.7[d]"
Owasp: A01:2021
CMMC v2.1: AC.L2-3.1.7 AC.L2-3.1.7

Tags

stig-medium-server compliance-server security-server stig-medium-desktop compliance-desktop security-desktop nist800-171-desktop nist800-171-server cmmc2-l2-desktop cmmc2-l2-server tisax