Ensure 'Idle timeout' is less than or equal to 10 minutes for SSH connections

MediumLevel 1Automatedf5-bigip

Description

To set an idle timeout for SSH sessions PASS requires sys sshd inactivity-timeout between 1 and 600 seconds. Audited against tmsh output with defaults shown: save the concatenated output of 'tmsh list auth password-policy all-properties', 'tmsh list auth source all-properties', 'tmsh list auth remote-user all-properties', 'tmsh list auth radius all-properties', 'tmsh list sys httpd all-properties', 'tmsh list sys sshd all-properties', 'tmsh list sys global-settings all-properties', 'tmsh list cli global-settings all-properties', 'tmsh list sys ntp', 'tmsh list sys snmp all-properties', 'tmsh list sys syslog' and 'tmsh list net self all-properties'. Patterns are scoped to the named top-level block.

How it is checked

Audit method: Configuration pattern

Pattern: (?m)^sys sshd \{\n(?:[ \t]+[^\n]*\n)*?[ \t]+inactivity-timeout (?:[1-9]\d?|[1-5]\d\d|600)[ \t]*$

How it is fixed

Fix method: Guidance or infrastructure patch

tmsh modify sys sshd inactivity-timeout 600 tmsh save sys config # CIS guidance: 1-Log in to tmsh by typing the following command: tmsh 2-To configure an automatic logout idle time (10 minutes) for SSH sessions, use the following command syntax: modify /sys sshd inactivity-timeout 600 3-Save the change by typing the following command: save /sys config

Properties

Operating systems: Any
Tags: f5-bigipmanagement
Reference: CIS F5 Networks Benchmark v1.0.0 - 4.2 Ensure 'Idle timeout' is less than or equal to 10 minutes for SSH connections

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

shell

tmaegis scan --target f5-bigip