cyberstrikeus CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0 - Control 4.2.19
Profile Applicability
- Level 1 - Server
- Level 1 - Workstation
Description
The PermitRootLogin parameter specifies if the root user can log in using SSH. The default is prohibit-password.
Rationale
Disallowing root logins over SSH requires system admins to authenticate using their own individual account, then escalating to root via sudo or su. This in turn limits opportunity for non-repudiation and provides a clear audit trail in the event of a security incident.
Audit Procedure
Command Line
Run the following command and verify the output:
sshd -T | grep -i permitrootlogin
Expected Result
permitrootlogin no
Remediation
Command Line
Edit the /etc/ssh/sshd_config file to set the parameter as follows:
PermitRootLogin no
Default Value
PermitRootLogin prohibit-password
References
- NIST SP 800-53 Rev. 5: AC-6(2)
CIS Controls
v8 - 5.4 Restrict Administrator Privileges to Dedicated Administrator Accounts - Restrict administrator privileges to dedicated administrator accounts on enterprise assets.
v7 - 4.3 Ensure the Use of Dedicated Administrative Accounts.
Profile Applicability
- Level 1 - Server
- Level 1 - Workstation
Assessment Status
Automated