AIX SSH daemon must be configured to only use Message Authentication Codes (MACs) employing FIPS 140-2 approved cryptographic hash algorithms.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-215294 | AIX7-00-002111 | SV-215294r991589_rule | Medium |
| Description |
| DoD information systems are required to use FIPS 140-2 approved cryptographic hash functions. |
| STIG | Date |
| IBM AIX 7.x Security Technical Implementation Guide | 2024-08-16 |
Details
| Check Text (C-16492r294333_chk) |
| Check the SSH daemon configuration for allowed MACs by running the following command: # grep -i macs /etc/ssh/sshd_config | grep -v '^#' MACs hmac-sha1,hmac-sha1-96,hmac-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96 If no lines are returned, or the returned MAC list contains any MAC that is not FIPS 140-2 approved, this is a finding. |
| Fix Text (F-16490r294334_fix) |
| Edit the "/etc/ssh/sshd_config" file and add/edit the following line to contain FIPS 140-2 approved ciphers: MACs hmac-sha1,hmac-sha1-96,hmac-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96 Restart SSH daemon: # stopsrc -s sshd # startsrc -s sshd Note: If the "MACs" configuration contains any ciphers that are not FIPS 140-2 approved, they should be removed from the configuration file. |