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4.2.17 Ensure SSH warning banner is configured

Information

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.

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.

Solution

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

Banner /etc/issue.net

Note: First occurrence of a option takes precedence, Match set statements withstanding.

See Also

https://workbench.cisecurity.org/benchmarks/13007

Item Details

Category: CONFIGURATION MANAGEMENT, IDENTIFICATION AND AUTHENTICATION

References: 800-53|CM-1, 800-53|CM-2, 800-53|CM-6, 800-53|CM-7, 800-53|IA-5

Plugin: Unix

Control ID: 146963945d9a6f08391fdeb3282d62fdbddfd4068235cd1a84ab64d39c0a7f73