STIGQter: STIG Summary: Amazon Linux 2023 Security Technical Implementation Guide Version: 1 Release: 4 Benchmark Date: 01 Jul 2026:

The Amazon Linux 2023 SSH client must be configured to use only DOD-approved Message Authentication Codes (MACs) employing FIPS 140-3-validated cryptographic hash algorithms to protect the confidentiality of SSH client connections.

DISA Rule

SV-283443r1192643_rule

Vulnerability Number

V-283443

Group Title

SRG-OS-000250-GPOS-00093

Rule Version

AZLX-23-001211

Severity

CAT I

CCI(s)

CCI-001453 - Implement cryptographic mechanisms to protect the integrity of remote access sessions.

Weight

Fix Recommendation

Configure the Amazon Linux 2023 SSH client to use only MACs employing FIPS 140-3-approved algorithms.

Reinstall crypto-policies with the following command:

$ sudo dnf -y reinstall crypto-policies

Set the crypto-policy to FIPS with the following command:

$ sudo update-crypto-policies --set FIPS

Setting system policy to FIPS

Note: Systemwide crypto policies are applied on application startup. It is recommended to restart the system for the change of policies to fully take place.

Check Contents

Verify the Amazon Linux 2023 SSH client is configured to use only MACs employing FIPS 140-3-approved algorithms.

To verify the MACs in the systemwide SSH configuration file, use the following command:

$ grep -i MACs /etc/crypto-policies/back-ends/openssh.config

MACs hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha2-256,hmac-sha2-512

If the MACs entries in the "openssh.config" file have any hashes other than "hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha2-256,hmac-sha2-512", or they are missing or commented out, this is a finding.

Vulnerability Number

V-283443

Documentable

False

Rule Version

AZLX-23-001211

Severity Override Guidance

Check Content Reference

Target Key

5700