CIS Ubuntu 14.04 LTS - 5.2.15 Ensure SSH warning banner is configured

Verify SSH Banner is configured to display a warning message before authentication

cyberstrikeus Updated

File contents

5.2.15 Ensure SSH warning banner is configured (Scored)

Profile Applicability

  • Level 1 - Server
  • Level 1 - Workstation

Description

The Banner parameter specifies a file whose contents must be sent to the remote user before authentication is permitted. By default, no banner is displayed.

Rationale

Banners are used to warn connecting users of the particular site's policy regarding connection. Presenting a warning message prior to the normal user login may assist the prosecution of trespassers on the computer system.

Audit Procedure

Run the following command and verify that output matches:

grep "^Banner" /etc/ssh/sshd_config

Expected Result

Banner /etc/issue.net

Remediation

Edit the /etc/ssh/sshd_config file to set the parameter as follows:

Banner /etc/issue.net

Default Value

Banner none

References

  • CIS Controls: 16 - Account Monitoring and Control

Profile

  • Level 1 - Server
  • Level 1 - Workstation

cyberstrikeus/cyberstrike/tree/main/.cyberstrike/skill/CIS_benchmarks/Operating_Systems/Ubuntu/cis-ubuntu-linux-14-04-lts-benchmark-v2/cis-ubuntu1404-v210-5-2-15 commit ec09d1ea51

Frequently asked questions

npx skillmds@latest add cyberstrikeus/cis-ubuntu-14-04-lts-5-2-15-ensure-ssh-warning-banner-is-con