Title

The SSH daemon must be configured to only use FIPS 140-2 approved ciphers. (Cat II impact)

Discussion

DoD information systems are required to use FIPS 140-2 approved ciphers. SSHv2 ciphers meeting this requirement are 3DES and AES.

Check Content

Check the SSH daemon configuration for allowed ciphers. # grep -i ciphers /etc/ssh/sshd_config | grep -v '^#' If no lines are returned, or the returned ciphers list contains any cipher not starting with 3des or aes, this is a finding.

Fix Text

Edit /etc/ssh/sshd_config and add or edit the "Ciphers" line. Only include ciphers that start with "3des" or "aes" and do not contain "cbc". For the list of available ciphers for the particular version of your software, consult the sshd_config manpage. Restart the SSH daemon.

Additional Identifiers

Rule ID: SV-26751r1_rule

Vulnerability ID: V-22458

Group Title: GEN005505

Expert Comments

CCIs tied to check.

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