V-223807

Discussion

Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. Cryptographic modules must adhere to the higher standards approved by the federal government since this provides assurance they have been tested and validated. Remote access (e.g., RDP) is access to DOD nonpublic information systems by an authorized user (or an information system) communicating through an external, nonorganization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. Cryptographic mechanisms used for protecting the integrity of information include, for example, signed hash functions using asymmetric cryptography enabling distribution of the public key to verify the hash information while maintaining the confidentiality of the secret key used to generate the hash.

Check Content

Locate the SSH daemon configuration file, which may be found in /etc/ssh/ directory.

Alternately:
From the Unix System Services ISPF Shell, navigate to ribbon select tools.
Select option 1 - Work with Processes.

If SSH Daemon is not active, this is not a finding.

Examine SSH daemon configuration file. 
sshd_config

If there are no "Ciphers" lines, or the ciphers list contains any cipher not starting with "aes", this is a finding.

If the MACs line is not configured to "hmac-sha1" or greater this is a finding.

Examine the z/OS-specific sshd server systemwide configuration: 
zos_sshd_config

If any of the following is untrue, this is a finding.

FIPSMODE=YES
CiphersSource=ICSF
MACsSource=ICSF