4.2.16 Ensure sshd MaxSessions is configured

Information

The MaxSessions parameter specifies the maximum number of open sessions permitted from a given connection.

To protect a system from denial of service due to a large number of concurrent sessions, use the rate limiting function of MaxSessions to protect availability of sshd logins and prevent overwhelming the daemon.

Solution

Edit the /etc/ssh/sshd_config file to set the parameter above any Include entries as follows:

MaxSessions 10

Note: First occurrence of a option takes precedence, Match set statements withstanding. If Include locations are enabled, used, and order of precedence is understood in your environment, the entry may be created in a file in Include location.

See Also

https://workbench.cisecurity.org/benchmarks/15286

Item Details

Category: ACCESS CONTROL

References: 800-53|AC-10

Plugin: Unix

Control ID: 96f69a2be3c659b6043363ccd4fdf515e009434902d1ea32fb0226482bd11619