Title

The SSH daemon must be configured to only use Message Authentication Codes (MACs) employing FIPS 140-2 approved cryptographic hash algorithms. (Cat II impact)

Discussion

DoD information systems are required to use FIPS 140-2 approved cryptographic hash functions.

Check Content

Check the SSH daemon configuration for allowed MACs. Procedure: # grep -i macs /etc/ssh/sshd_config | grep -v '^#' If no lines are returned, or the returned MACs list contains any MAC less than "hmac-sha1", this is a finding.

Fix Text

Edit the SSH daemon configuration and remove any MACs less than "hmac-sha1". If necessary, add a "MACs" line. Restart the SSH daemon. # /sbin/service sshd restart

Additional Identifiers

Rule ID: SV-46012r3_rule

Vulnerability ID: V-22460

Group Title: GEN005507

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.