STIGQter: STIG Summary: Tri-Lab Operating System Stack (TOSS) 4 Security Technical Implementation Guide Version: 2 Release: 6 Benchmark Date: 01 Jul 2026:

TOSS, for PKI-based authentication, must enforce authorized access to the corresponding private key.

DISA Rule

SV-252913r958450_rule

Vulnerability Number

V-252913

Group Title

SRG-OS-000067-GPOS-00035

Rule Version

TOSS-04-010020

Severity

CAT II

CCI(s)

• CCI-000186 - For public key-based authentication, enforce authorized access to the corresponding private key.

Weight

10

Fix Recommendation

Create a new private and public key pair that utilizes a passcode with the following command:

$ sudo ssh-keygen -n [passphrase]

Check Contents

Verify the operating system, for PKI-based authentication, enforces authorized access to the corresponding private key.

If the system does not allow PKI authentication, this requirement is Not Applicable.

Verify the SSH private key files have a passphrase.

For each private key stored on the system, use the following command:

$ sudo ssh-keygen -y -f /path/to/file

If the contents of the key are displayed, and use of un-passphrased SSH keys is not documented with the Information System Security Officer (ISSO), this is a finding.

Vulnerability Number

V-252913

Documentable

False

Rule Version

TOSS-04-010020

Severity Override Guidance

Verify the operating system, for PKI-based authentication, enforces authorized access to the corresponding private key.

If the system does not allow PKI authentication, this requirement is Not Applicable.

Verify the SSH private key files have a passphrase.

For each private key stored on the system, use the following command:

$ sudo ssh-keygen -y -f /path/to/file

If the contents of the key are displayed, and use of un-passphrased SSH keys is not documented with the Information System Security Officer (ISSO), this is a finding.

Check Content Reference

M

Target Key

5469