Title

Logon options must be configured and enforced (Restricted Sites zone). (Cat II impact)

Discussion

Users could submit credentials to servers operated by malicious individuals who could then attempt to connect to legitimate servers with those captured credentials. Care must be taken with user credentials, automatic logon performance, and how default Windows credentials are passed to websites. This policy setting allows management of settings for logon options. If you enable this policy setting, you can choose from varying logon options. “Anonymous logon” disables HTTP authentication and uses the guest account only for the Common Internet File System (CIFS) protocol. “Prompt for user name and password” queries users for user IDs and passwords. After a user is queried, these values can be used silently for the remainder of the session. “Automatic logon only in Intranet zone” queries users for user IDs and passwords in other zones. After a user is queried, these values can be used silently for the remainder of the session. “Automatic logon with current user name and password” attempts logon using Windows NT Challenge Response. If Windows NT Challenge Response is supported by the server, the logon uses the user's network user name and password for login. If Windows NT Challenge Response is not supported by the server, the user is queried to provide the user name and password. If you disable this policy setting, logon is set to “Automatic logon only in Intranet zone”. If you do not configure this policy setting, logon is set to “Automatic logon only in Intranet zone”. The most secure option is to configure this setting to “Enabled”; “Anonymous logon”. This will prevent users from submitting credentials to servers in this security zone.

Check Content

The policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Internet Control Panel -> Security Page -> Restricted Sites Zone -> "Logon options" must be "Enabled", and "Anonymous logon" selected from the drop-down box. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4 Criteria: If the value 1A00 is REG_DWORD = 196608 (decimal), this is not a finding.

Fix Text

Set the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Internet Control Panel -> Security Page -> Restricted Sites Zone -> "Logon options" to "Enabled", and select "Anonymous logon" from the drop-down box.

Additional Identifiers

Rule ID: SV-45271r1_rule

Vulnerability ID: V-6311

Group Title: DTBI136-User Authentication - Logon - Restricted

Expert Comments

CCIs tied to check.

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