Title

Amount of idle time required before suspending a session is improperly set. (Cat III impact)

Discussion

Administrators should use this setting 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.

Check Content

Analyze the system using the Security Configuration and Analysis snap-in. Expand the Security Configuration and Analysis tree view. Navigate to Local Policies -> Security Options. If the value for “Microsoft Network Server: Amount of idle time required before suspending a session” is not set to ”15" minutes or less, then this is a finding. The policy referenced configures the following registry value: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \System\CurrentControlSet\Services\LanManServer\Parameters\ Value Name: AutoDisconnect Value Type: REG_DWORD Value: 15

Fix Text

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 a session” to ”15” minutes or less.

Additional Identifiers

Rule ID: SV-1174r1_rule

Vulnerability ID: V-1174

Group Title: Idle Time Before Suspending a Session.

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.