Title

Unauthorized named pipes are accessible with anonymous credentials. (Cat I impact)

Discussion

This is a Category 1 finding because the potential for gaining unauthorized system access. Pipes are internal system communications processes. They are identified internally by ID numbers that vary between systems. To make access to these processes easier, these pipes are given names that do not vary between systems. This setting controls which of these pipes anonymous users may 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 -> Security Options. If the value for “Network access: Named pipes that can be accessed anonymously” contains entries besides “NETLOGON, Lsarpc, samr, browser”, 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: NullSessionPipes Value Type: REG_MULTI_SZ Value: As defined in the policy above Note: Legitimate applications may add entries to this registry value. If an application requires these entries to function properly and is documented with the IAO this would not be a finding. Documentation should contain supporting information from the vendor's instructions.

Fix Text

Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> “Network access: Named pipes that can be accessed anonymously” as defined in the Check section.

Additional Identifiers

Rule ID: SV-15089r1_rule

Vulnerability ID: V-3338

Group Title: Anonymous Access to Named Pipes

Expert Comments

CCIs tied to check.

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