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WN25-SH-000100 Windows Server 2025 OpenSSH public host key files must conform to minimum requirements.

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

Maps to CM-6 via CCI-000366

Title

Windows Server 2025 OpenSSH public host key files must conform to minimum requirements.

Control

If OpenSSH is not installed on the system, this requirement is not applicable. Verify the SSH public host key files permissions with the following command: C:\ > Get-ChildItem -Path "C:\ProgramData\ssh" -Filter "*key.pub" -File | ForEach-Object { icacls.exe $_.FullName } C:\ProgramData\ssh\ssh_host_ecdsa_key.pub BUILTIN\Administrators:(F) NT AUTHORITY\SYSTEM:(F) Successfully processed 1 files; Failed processing 0 files C:\ProgramData\ssh\ssh_host_ed25519_key.pub BUILTIN\Administrators:(F) NT AUTHORITY\SYSTEM:(F) Successfully processed 1 files; Failed processing 0 files C:\ProgramData\ssh\ssh_host_rsa_key.pub BUILTIN\Administrators:(F) NT AUTHORITY\SYSTEM:(F) Successfully processed 1 files; Failed processing 0 files If any public host key file does not have the default permission as in the example output, this is a finding.

Discussion

If a public host key file is modified by an unauthorized user, the SSH service may be compromised.

Related controls

CCI-000366

Fix

Maintain the permissions of the public host key files as follows: BUILTIN\Administrators:(F) NT AUTHORITY\SYSTEM:(F)