Title

All TOSS networked systems must have and implement SSH to protect the confidentiality and integrity of transmitted and received information, as well as information during preparation for transmission. (Cat II impact)

Discussion

Without protection of the transmitted information, confidentiality and integrity may be compromised because unprotected communications can be intercepted and either read or altered. This requirement applies to both internal and external networks and all types of information system components from which information can be transmitted (e.g., servers, mobile devices, notebook computers, printers, copiers, scanners, and facsimile machines). Communication paths outside the physical protection of a controlled boundary are exposed to the possibility of interception and modification. Protecting the confidentiality and integrity of organizational information can be accomplished by physical means (e.g., employing physical distribution systems) or by logical means (e.g., employing cryptographic techniques). If physical means of protection are employed, then logical means (cryptography) do not have to be employed, and vice versa. Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188, SRG-OS-000425-GPOS-00189, SRG-OS-000426-GPOS-00190

Check Content

Verify that the SSH package is installed: $ rpm -q openssh-server openssh-server-8.0p1-10.el8_4.2.x86_64 If the "SSH server" package is not installed, this is a finding. Verify SSH is loaded and active with the following commands: $ sudo systemctl is-active sshd active $ sudo systemctl is-enabled sshd enabled If "sshd" does not show a status of "active" and "enabled", this is a finding.

Fix Text

Install the SSH server package onto the host with the following command: $ sudo yum install openssh-server Configure the SSH service to automatically start now and after each reboot with the following command: $ sudo systemctl enable --now sshd.service

Additional Identifiers

Rule ID: SV-252934r958908_rule

Vulnerability ID: V-252934

Group Title: SRG-OS-000423-GPOS-00187

Expert Comments

CCIs tied to check.

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