The system must not permit direct logons to the root account using remote access via SSH.

From Red Hat Enterprise Linux 7 Security Technical Implementation Guide

Associated with: CCI-000366

SV-86871r2_rule The system must not permit direct logons to the root account using remote access via SSH.

Vulnerability discussion

Even though the communications channel may be encrypted, an additional layer of security is gained by extending the policy of not logging on directly as root. In addition, logging on with a user-specific account provides individual accountability of actions performed on the system.

Check content

Verify remote access using SSH prevents users from logging on directly as root. Check that SSH prevents users from logging on directly as root with the following command: # grep -i permitrootlogin /etc/ssh/sshd_config PermitRootLogin no If the "PermitRootLogin" keyword is set to "yes", is missing, or is commented out, this is a finding.

Fix text

Configure SSH to stop users from logging on remotely as the root user. Edit the appropriate "/etc/ssh/sshd_config" file to uncomment or add the line for the "PermitRootLogin" keyword and set its value to "no" (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor): PermitRootLogin no The SSH service must be restarted for changes to take effect.

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