The AIX SSH server must use SSH Protocol 2.

Without confidentiality protection mechanisms, unauthorized individuals may gain access to sensitive information via a remote access session.

Remote access is access to DoW nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless.

Encryption provides a means to secure the remote connection to prevent unauthorized access to the data traversing the remote access connection (e.g., RDP), thereby providing a degree of confidentiality. The encryption strength of a mechanism is selected based on the security categorization of the information.

From the command prompt, run the following command: # grep ^Protocol /etc/ssh/sshd_config

The above command should yield the following output: Protocol 2

If the above command does not show the ssh server supporting "Protocol 2" only, this is a finding.

Add or edit the following line in the "/etc/ssh/sshd_config" file to support "Protocol 2" only: Protocol 2

Save the change to /etc/ssh/sshd_config

Restart ssh daemon: # stopsrc -s sshd # startsrc -s sshd