From Canonical Ubuntu 16.04 LTS Security Technical Implementation Guide
Part of SRG-OS-000163-GPOS-00072
Associated with: CCI-000879 CCI-001133 CCI-002361
Automatic session termination addresses the termination of user-initiated logical sessions in contrast to the termination of network connections that are associated with communications sessions (i.e., network disconnect). A logical session (for local, network, and remote access) is initiated whenever a user (or process acting on behalf of a user) accesses an organizational information system. Such user sessions can be terminated (and thus terminate user access) without terminating network sessions.
Verify that all network connections associated with SSH traffic are automatically terminated at the end of the session or after "10" minutes of inactivity. Check that the "ClientAliveInterval" variable is set to a value of "600" or less by performing the following command: # sudo grep -i clientalive /etc/ssh/sshd_config ClientAliveInterval 600 ClientAliveCountMax 1 If "ClientAliveInterval" or "ClientAliveCountMax" does not exist, "ClientAliveInterval" is not set to a value of "600" or less and "ClientAliveCountMax" is not set to a value of "1" or greater in "/etc/ssh/sshd_config", or either line is commented out, this is a finding.
Configure the Ubuntu operating system to automatically terminate all network connections associated with SSH traffic at the end of a session or after a "10" minute period of inactivity. Modify or append the following lines in the "/etc/ssh/sshd_config" file replacing "[Interval]" with a value of "600" or less and "[CountMax] with a value of "1" or greater: ClientAliveInterval 600 ClientAliveCountMax 1 In order for the changes to take effect, the SSH daemon must be restarted. # sudo systemctl restart sshd.service
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