Check: AOSX-09-000720
Apple OS X 10.9 Workstation STIG:
AOSX-09-000720
(in version v1 r2)
Title
The SSH daemon ClientAliveInterval option must be set correctly. (Cat II impact)
Discussion
SSH should be configured to log users out after a 15 minute interval of inactivity and to only wait 30 seconds before timing out login attempts. Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle session or an incomplete login attempt will also free up resources committed by the managed network element.
Check Content
The SSH daemon ClientAliveInterval option must be set correctly. To check the idle timeout setting for SSH sessions, run the following: sudo grep ^ClientAliveInterval /etc/sshd_config If the setting is not '600', this is a finding.
Fix Text
In order to make sure that ClientAliveInterval is set correctly, run the following command: sudo sed -i.bak 's/.*ClientAliveInterval.*/ClientAliveInterval 600/' /etc/sshd_config
Additional Identifiers
Rule ID: SV-72813r1_rule
Vulnerability ID: V-58383
Group Title:
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-001133 |
The information system terminates the network connection associated with a communications session at the end of the session or after an organization-defined time period of inactivity. |
Controls
Number | Title |
---|---|
SC-10 |
Network Disconnect |