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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-215294r508663_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 2023-08-23

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.