BaselineWatch
Desk
Your fleet and your work Fleetyour releases and the hardware they run onTriagewhat needs a decisionWatchlistthe products and platforms you runSaved searchesthe lists you come back to
This instance Sourceswhat is read, how often, under what termsDigestthe daily or weekly summary, and alerts
How it is drawn Appearancethe look and the colour schemeBrandingthe mark this instance wears
Owner sign-in

WN25-SH-000090 Windows Server 2025 OpenSSH private 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 private 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 private host key files permissions with the following command: C:\ > Get-ChildItem -Path "C:\ProgramData\ssh" -Filter "*_key" -File | ForEach-Object { icacls.exe $_.FullName } C:\ProgramData\ssh\ssh_host_ecdsa_key BUILTIN\Administrators:(F) NT AUTHORITY\SYSTEM:(F) Successfully processed 1 files; Failed processing 0 files C:\ProgramData\ssh\ssh_host_ed25519_key BUILTIN\Administrators:(F) NT AUTHORITY\SYSTEM:(F) Successfully processed 1 files; Failed processing 0 files C:\ProgramData\ssh\ssh_host_rsa_key BUILTIN\Administrators:(F) NT AUTHORITY\SYSTEM:(F) Successfully processed 1 files; Failed processing 0 files If any private host key file does not have the default permission as in the example output, this is a finding.

Discussion

If an unauthorized user obtains the private SSH host key file, the host could be impersonated.

Related controls

CCI-000366

Fix

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