Title

The SSH client 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 client configuration for allowed MACs. # grep -i macs /etc/ssh/ssh_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 client configuration and remove any MACs less than "hmac-sha1". If necessary, add a "MACs" line.

Additional Identifiers

Rule ID: SV-46020r2_rule

Vulnerability ID: V-22463

Group Title: GEN005512

Expert Comments

CCIs tied to check.

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