Title

The Deny log on through Terminal Services user right on domain controllers must prevent all access if TS is not used by the organization. If TS is used, it must be configured to prevent unauthenticated access. (Cat II impact)

Discussion

Inappropriate granting of user rights can provide system, administrative, and other high level capabilities. The "Deny log on through Terminal Services" right defines the accounts that are prevented from logging on using Terminal Services which allows remote connections. If Terminal Services is not used by the organization, the Everyone group must be assigned this right to prevent all access. If Terminal Services is used by the organization, the Guests group must be assigned this right to prevent unauthenticated access.

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 -> User Rights Assignment. If the following accounts or groups are not defined for the "Deny log on through Terminal Services" right, this is a finding: Everyone - If Terminal Services is not used by the organization. Guests - If Terminal Services is used by the organization.

Fix Text

Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> User Rights Assignment -> "Deny log on through Terminal Services" to include the following. If Terminal Services is not used by the organization, assign the Everyone group this right to prevent all access. If TS is used by the organization, assign the Guests group.

Additional Identifiers

Rule ID: SV-47138r1_rule

Vulnerability ID: V-26486

Group Title:

Expert Comments

CCIs tied to check.

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