Title

All 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 I 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, 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 the "ssh" meta-package is installed. Check that the ssh package is installed with the following command: $ dpkg -l | grep openssh ii openssh-client 1:7.2p2-4Ubuntu2.1 amd64 secure shell (SSH) client, for secure access to remote machines ii openssh-server 1:7.2p2-4Ubuntu2.1 amd64 secure shell (SSH) server, for secure access from remote machines ii openssh-sftp-server 1:7.2p2-4Ubuntu2.1 amd64 secure shell (SSH) sftp server module, for SFTP access from remote machines If the "openssh" server package is not installed, this is a finding. Check that the "sshd.service" is loaded and active with the following command: # systemctl status sshd.service | egrep -i "(active|loaded)" Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled) Active: active (running) since Sun 2016-06-05 23:46:29 CDT; 1h 4min ago If "sshd.service" is not active or loaded, this is a finding.

Fix Text

Install the "ssh" meta-package on the system with the following command: # sudo apt install ssh Enable the "ssh" service to start automatically on reboot with the following command: # sudo systemctl enable sshd.service

Additional Identifiers

Rule ID: SV-215139r610931_rule

Vulnerability ID: V-215139

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.