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Anonymous enumeration of SAM accounts must not be allowed.


Overview

Finding ID Version Rule ID IA Controls Severity
V-26283 WN08-SO-000051 SV-48508r2_rule ECSC-1 High
Description
Anonymous enumeration of SAM accounts allows anonymous log on users (null session connections) to list all accounts names, thus providing a list of potential points to attack the system.
STIG Date
Windows 8/8.1 Security Technical Implementation Guide 2018-02-12

Details

Check Text ( C-45159r2_chk )
Analyze the system using the Security Configuration and Analysis snap-in. (See "Performing Analysis with the Security Configuration and Analysis Snap-in" in the STIG Overview document.)
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", 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-41632r1_fix)
Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "Network access: Do not allow anonymous enumeration of SAM accounts" to "Enabled".