Anonymous enumeration of shares will be restricted.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-1093	3.018	SV-32283r1_rule	ECSC-1 PRNK-1	High

Description
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. By default, Windows allows anonymous users to list account names and enumerate share names.

STIG	Date
Windows Server 2008 R2 Member Server Security Technical Implementation Guide	2015-03-09

Details

Check Text ( C-33804r1_chk )
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 and shares” is not set to “Enabled”, then this is a finding. The policy referenced configures the following registry value: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \System\CurrentControlSet\Control\Lsa\ Value Name: RestrictAnonymous 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.

Check Text ( C-33804r1_chk )

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 and shares” is not set to “Enabled”, then this is a finding.

The policy referenced configures the following registry value:

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \System\CurrentControlSet\Control\Lsa\

Value Name: RestrictAnonymous

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 (F-29449r1_fix)
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 shares” to “Enabled".