The SSH daemon ClientAliveInterval option must be set correctly.

From Apple OS X 10.8 (Mountain Lion) Workstation STIG

Associated with: CCI-001133

SV-65557r1_rule The SSH daemon ClientAliveInterval option must be set correctly.

Vulnerability discussion

This requirement applies to both internal and external networks. Terminating network connections associated with communications sessions means de-allocating associated TCP/IP address/port pairs at the operating system level.The time period of inactivity may, as the organization deems necessary, be a set of time periods by type of network access or for specific accesses.

Check content

To check which the idle timeout setting for SSH sessions, run the following: grep ClientAliveInterval /etc/sshd_config If these setting is not "600", or commented out, this is a finding.

Fix text

In order to make sure that the correct ClientAliveInterval is set correctly, run the following command: sudo sed -i.bak 's/.*ClientAliveInterval.*/ClientAliveInterval 600/' /etc/sshd_config

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