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Anonymous enumeration of SAM accounts will not be allowed.


Overview

Finding ID Version Rule ID IA Controls Severity
V-26283 3.019 SV-33732r1_rule High
Description
This is a Category 1 finding as it allows anonymous logon users (null session connections) to list all account names, thus providing a list of potential points to attack the system.
STIG Date
Windows Server 2008 R2 Member Server Security Technical Implementation Guide 2019-06-18

Details

Check Text ( C-33725r1_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” 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: RestrictAnonymousSAM

Value Type: REG_DWORD
Value: 1
Fix Text (F-29359r1_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” to “Enabled".