Title

Anonymous shares are not restricted. (Cat I impact)

Discussion

This is a Category 1 finding because it allows anonymous logon users (null session connections) to list all account names and enumerate all shared resources, thus providing a map of potential points to attack the system.

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 “Network access: Do not allow anonymous enumeration of SAM accounts” is not set to “Enabled”, then this is a finding. If the value for “Network access: Do not allow anonymous enumeration of SAM accounts and shares” is not set to “Enabled”, then this is a finding. The policies referenced configure the following registry values: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \System\CurrentControlSet\Control\Lsa\ Value Name: RestrictAnonymousSAM (Sam accounts) And Value Name: RestrictAnonymous (Sam accounts and shares) Value Type: REG_DWORD Value: 1 Documentable Explanation: If the required settings cannot be used to allow for proper operation in a mixed Windows environment, then this should be documented with the IAO.

Fix Text

Configure the policy values for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> “Network access: Do not allow anonymous enumeration of SAM accounts” and “Network access: Do not allow anonymous enumeration of SAM accounts and shares” to “Enabled".

Additional Identifiers

Rule ID: SV-28982r1_rule

Vulnerability ID: V-1093

Group Title: Anonymous shares are not restricted

Expert Comments

CCIs tied to check.

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