cyberstrikeus CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 - Control 5.3.11
Description
The PermitRootLogin parameter specifies if the root user can log in using ssh. The default is no.
Rationale
Disallowing root logins over SSH requires system admins to authenticate using their own individual account, then escalating to root via sudo. 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 that output matches:
sshd -T -C user=root -C host="$(hostname)" -C addr="$(grep $(hostname) /etc/hosts | awk '{print $1}')" | grep permitrootlogin
Expected Result
permitrootlogin no
Run the following command and verify the output:
grep -Ei '^\s*PermitRootLogin\s+yes' /etc/ssh/sshd_config
Nothing should be returned.
Remediation
Command Line
Edit the /etc/ssh/sshd_config file to set the parameter as follows:
PermitRootLogin no
Default Value
PermitRootLogin without-password
References
- SSHD_CONFIG(5)
CIS Controls
Version 7
4.3 Ensure the Use of Dedicated Administrative Accounts - Ensure that all users with administrative account access use a dedicated or secondary account for elevated activities. This account should only be used for administrative activities and not internet browsing, email, or similar activities.
Profile Applicability
- Level 1 - Server
- Level 1 - Workstation
Assessment Status
Automated