The amount of idle time required before suspending a session must be configured to 15 minutes or less.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-73659	WN16-SO-000220	SV-88323r1_rule		Medium

Description
Open sessions can increase the avenues of attack on a system. This setting is used to control when a computer disconnects an inactive SMB session. If client activity resumes, the session is automatically reestablished. This protects critical and sensitive network data from exposure to unauthorized personnel with physical access to the computer. Satisfies: SRG-OS-000163-GPOS-00072, SRG-OS-000279-GPOS-00109

Description

Open sessions can increase the avenues of attack on a system. This setting is used to control when a computer disconnects an inactive SMB session. If client activity resumes, the session is automatically reestablished. This protects critical and sensitive network data from exposure to unauthorized personnel with physical access to the computer. Satisfies: SRG-OS-000163-GPOS-00072, SRG-OS-000279-GPOS-00109

STIG	Date
Windows Server 2016 Security Technical Implementation Guide	2017-05-18

Details

Check Text ( C-73741r1_chk )
If the following registry value does not exist or is not configured as specified, this is a finding. Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SYSTEM\CurrentControlSet\Services\LanManServer\Parameters\ Value Name: autodisconnect Value Type: REG_DWORD Value: 0x0000000f (15) (or less)

Fix Text (F-80109r1_fix)
Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Microsoft Network Server: Amount of idle time required before suspending session" to "15" minutes or less.