Anonymous enumeration of shares will be restricted.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-1093	3.018	SV-25090r1_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 7 Security Technical Implementation Guide	2014-04-02

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".