The F5 BIG-IP appliance must terminate all network connections associated with a communications session at the end of the session or after 15 minutes of inactivity.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
high	V-266155	SRG-NET-000213-ALG-000107	F5BI-AP-300056	SV-266155r1024382_rule	2024-09-20	1

Description
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. Quickly terminating an idle session will also free up resources committed by the managed network element. Terminating network connections associated with communications sessions includes, for example, deallocating associated TCP/IP address/port pairs at the operating system level and deallocating networking assignments at the application level if multiple application sessions are using a single operating system-level network connection. ALGs may provide session control functionality as part of content filtering, load balancing, or proxy services.

Description

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. Quickly terminating an idle session will also free up resources committed by the managed network element. Terminating network connections associated with communications sessions includes, for example, deallocating associated TCP/IP address/port pairs at the operating system level and deallocating networking assignments at the application level if multiple application sessions are using a single operating system-level network connection. ALGs may provide session control functionality as part of content filtering, load balancing, or proxy services.

ℹ️ Check
From the BIG-IP GUI: 1. Access. 2. Profiles/Policies. 3. Access Profiles. 4. Click the name of the Access Profile. 5. Verify "Inactivity Timeout" is configured for 900 seconds. If the BIG-IP appliance is not configured to terminate all network connections associated with a user (nonprivileged) communications session after 15 minutes of inactivity, this is a finding.

✔️ Fix
From the BIG-IP GUI: 1. Access. 2. Profiles/Policies. 3. Access Profiles. 4. Click the name of the Access Profile. 5. Set "Inactivity Timeout" to 900 seconds. Note: If the setting is grayed out, check the box to the right of the setting. 6. Click "Update".