AlmaLinux OS 9 SSH client must be configured to use only Message Authentication Codes (MACs) employing FIPS 140-3-validated cryptographic hash algorithms.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-269115 | ALMA-09-003210 | SV-269115r1107608_rule | Medium |
| Description |
| Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Remote access (e.g. RDP) is access to DOD nonpublic information systems by an authorized user (or an information system) communicating through an external, nonorganization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. Cryptographic mechanisms used for protecting the integrity of information include, for example, signed hash functions using asymmetric cryptography enabling distribution of the public key to verify the hash information while maintaining the confidentiality of the secret key used to generate the hash. AlmaLinux OS 9 incorporates systemwide crypto policies by default. The /etc/ssh/ssh_config file has no effect on the ciphers, MACs, or algorithms. The employed algorithms can be viewed in the /etc/crypto-policies/back-ends/openssh.config file. |
| STIG | Date |
| CloudLinux AlmaLinux OS 9 Security Technical Implementation Guide | 2025-05-22 |
Details
| Check Text (C-73146r1107606_chk) |
| Verify the 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. |
| Fix Text (F-73047r1107607_fix) |
| Configure the 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 |