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WN25-SH-000110 Windows Server 2025 OpenSSH must not allow GSSAPI authentication.

DISA STIG library V1R4
All changes in this version
first version loaded CAT II

Maps to CM-5(1) via CCI-001813

Title

Windows Server 2025 OpenSSH must not allow GSSAPI authentication.

Control

If OpenSSH is not installed on the system, this requirement is not applicable. Verify the system does not allow GSSAPI authentication with the following command: C:\ > Get-Content "$env:ProgramData\ssh\sshd_config" | Select-String -Pattern '^\s*GSSAPIAuthentication' GSSAPIAuthentication no If the value is returned as "yes", the returned line is commented out, or no output is returned, this is a finding.

Discussion

Generic Security Service Application Program Interface (GSSAPI) authentication is used to provide additional authentication mechanisms to applications. Allowing GSSAPI authentication through SSH exposes the system's GSSAPI to remote hosts, increasing the attack surface of the system. Satisfies: SRG-OS-000364-GPOS-00151, SRG-OS-000480-GPOS-00228

Related controls

CCI-001813

Fix

To configure the system, add or modify the following line in the "$env:ProgramData/ssh/sshd_config" file: GSSAPIAuthentication no Restart the OpenSSH service for the settings to take effect.