Title

Remote Desktop Services must be configured to use session-specific temporary folders. (Cat II impact)

Discussion

If a communal temporary folder is used for remote desktop sessions, it might be possible for users to access other users' temporary folders. If this setting is enabled, only one temporary folder is used for all remote desktop sessions. Per session temporary folders must be established.

Check Content

If the following registry value does not exist or is not configured as specified, this is a finding: Registry Hive: HKEY_LOCAL_MACHINE Subkey: \Software\Policies\Microsoft\Windows NT\Terminal Services\ Value Name: PerSessionTempDir Type: REG_DWORD Value: 1

Fix Text

Configure the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Remote Desktop Services -> Remote Desktop Session Host -> Temporary Folders -> "Do not use temporary folders per session" to "Disabled".

Additional Identifiers

Rule ID: SV-48090r1_rule

Vulnerability ID: V-3455

Group Title: TS/RDS - Do Not Use Temp Folders

Expert Comments

CCIs tied to check.

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