Network Access: Microsoft network Server: Digitally sign communications (always) must be configured to Enabled

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The server message block (SMB) protocol provides the basis for many network operations. Digitally signed SMB packets aid in preventing man-in-the-middle attacks. If this policy is enabled, the SMB server will only communicate with an SMB client that performs SMB packet signing

Remediation

To fix this configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Microsoft network server: Digitally sign communications (always)" to "Enabled".

STIG: Server 2019: https://www.stigviewer.com/stig/microsoft_windows_server_2019/2022-03-01/finding/V-205827
Server 2016: https://www.stigviewer.com/stig/microsoft_windows_server_2016/2022-03-01/finding/V-225042

NIST 800-53: SC-12(2),SC-12(3),SC-13
NIST 800-171 Rev2: 3.13.11
NIST 800-171A: 3.8.6, 3.13.11
CMMC v2.0 Mapping v1.02: SC.3.177
CMMC V2.0 Level 2: SC.L2-3.13.11
CMMC v2.0 Level 3: SC.L2-3.13.11, TBD - 3.14.1e
CSA CMM v4: CEK-01, CEK-02, CEK-03, CEK-04, DSP-10, LOG-10, LOG-11
PCI DSS 3.2: 2.2.3, 4.1
PCI DSS 4.0: 3.3.2, 8.3.2, 12.3.3
SIG: D.7.5.1
STIG: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188