The application must initiate a session lock after a 15-minute period of inactivity.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-234256	LVDA-VD-000015	SV-234256r628796_rule		Medium

Description
A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their application session prior to vacating the vicinity, applications need to be able to identify when a user's application session has idled and take action to initiate the session lock. The session lock is implemented at the point where session activity can be determined and/or controlled. This is typically at the operating system-level and results in a system lock, but may be at the application-level where the application interface window is secured instead.

Description

A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their application session prior to vacating the vicinity, applications need to be able to identify when a user's application session has idled and take action to initiate the session lock. The session lock is implemented at the point where session activity can be determined and/or controlled. This is typically at the operating system-level and results in a system lock, but may be at the application-level where the application interface window is secured instead.

STIG	Date
Citrix Virtual Apps and Desktop 7.x Linux Virtual Delivery Agent Security Technical Implementation Guide	2021-02-01

Details

Check Text ( C-37441r612322_chk )
All timer values are defined in the registration table. Retrieve current value using the following command: /opt/Citrix/VDA/bin/ctxreg, /opt/Citrix/VDA/bin/ctxreg dump \|grep MaxIdleTime If MaxIdleTime is not set to "15 minutes" or less, this is a finding.

Fix Text (F-37406r612323_fix)
Set value for Idle Timer /opt/Citrix/VDA/bin/ctxreg update -k "HKLM\System\CurrentControlSet\Control\Citrix\WinStations\cgp" -v "MaxIdleTime" -d "0x0000000F" /opt/Citrix/VDA/bin/ctxreg update -k "HKLM\System\CurrentControlSet\Control\Citrix\WinStations\tcp" -v "MaxIdleTime" -d "0x0000000F" /opt/Citrix/VDA/bin/ctxreg update -k "HKLM\System\CurrentControlSet\Control\Citrix\WinStations\ssl" -v "MaxIdleTime" -d "0x0000000F" where "0x0000000F" is hexadecimal for 15

Fix Text (F-37406r612323_fix)

Set value for Idle Timer
/opt/Citrix/VDA/bin/ctxreg update -k "HKLM\System\CurrentControlSet\Control\Citrix\WinStations\cgp" -v "MaxIdleTime" -d "0x0000000F"
/opt/Citrix/VDA/bin/ctxreg update -k "HKLM\System\CurrentControlSet\Control\Citrix\WinStations\tcp" -v "MaxIdleTime" -d "0x0000000F"
/opt/Citrix/VDA/bin/ctxreg update -k "HKLM\System\CurrentControlSet\Control\Citrix\WinStations\ssl" -v "MaxIdleTime" -d "0x0000000F"
where "0x0000000F" is hexadecimal for 15