SV-36025r1: Anonymous enumeration of SAM accounts will not be allowed. | Windows 7 Security Technical Implementation Guide

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Assessment Title

Rule Text

Anonymous enumeration of SAM accounts will not be allowed.

Description

Discussion Text

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.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-000366CCE-9249-4

Additional Details

Responsibility

System Administrator

References

DPMS Target Windows 7 DISA DPMS Target Windows 7 1712

Checks

OVAL

oval:mil.disa.fso.windows:var:370300 ← xccdf_mil.disa.stig_value_do_not_allow_anonymous_enumeration_sam_var

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

# Windows PowerShell
# Reconstructed from oval:mil.disa.fso.windows:def:3703
# Anonymous enumeration of SAM accounts will not be allowed.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies 'Network access: Do not allow anonymous enumeration of SAM accounts' is set to 'Enabled'
# registry_object (registry_test)
function test_1 {
  return (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Lsa').GetValueKind('RestrictAnonymousSAM').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Lsa' -Name 'RestrictAnonymousSAM' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'RestrictAnonymousSAM') -eq 1))
}

if (test_1) {
  Write-Output "PASS"
} else {
  Write-Output "FAIL"
}

Assessment Script Powered by AISyntax-verified

A standalone PowerShell script to assess this control automatically. Review before running it in your environment.

Syntax-checked as valid PowerShell. Not executed here — running it for real needs the actual windows_7 target this check assesses.

$compliant = (Get-ItemProperty -Path "HKLM:\System\CurrentControlSet\Control\Lsa" -Name "RestrictAnonymousSAM" -ErrorAction SilentlyContinue).RestrictAnonymousSAM -eq 1; if ($compliant) {Write-Output "PASS"; Exit 0} else {Write-Output "FAIL"; Exit 1}

Remediation

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".