SV-220933r1081053: Remote calls to the Security Account Manager (SAM) must be restricted to Administrators. | Microsoft Windows 10 STIG SCAP Benchmark

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Assessment Title

Rule Text

Remote calls to the Security Account Manager (SAM) must be restricted to Administrators.

Description

Discussion Text

The Windows SAM stores users' passwords. Restricting remote rpc connections to the SAM to Administrators helps protect those credentials.

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

IA Controls

NIST SP 800-53

Not mappedCCI-002235SV-86393V-71769

References

DPMS Target Microsoft Windows 10 DISA DPMS Target Microsoft Windows 10 4072

Checks

DISA STIG (Manual Reference)

Windows 10 v1507 LTSB version does not include this setting, it is NA for those systems.

If the following registry value does not exist or is not configured as specified, this is a finding:

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

Value Name: RestrictRemoteSAM

Value Type: REG_SZ
Value: O:BAG:BAD:(A;;RC;;;BA)                                                   

If a domain application account such as for a management tool requires this user right, this is not a finding.
Vendor documentation must support the requirement for having the user right.
The requirement must be documented with the ISSO.

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.stig.windows10:def:220933
# Remote calls to the Security Account Manager (SAM) must be restricted to Administrators.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Allow Administrators group to make remote calls to SAM
# 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('RestrictRemoteSAM').ToString()]) -eq 'reg_sz') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa' -Name 'RestrictRemoteSAM' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'RestrictRemoteSAM') -eq 'O:BAG:BAD:(A;;RC;;;BA)'))
}

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

Remediation

Navigate to the policy Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network access: Restrict clients allowed to make remote calls to SAM".

Select "Edit Security" to configure the "Security descriptor:".

Add "Administrators" in "Group or user names:" if it is not already listed (this is the default).

Select "Administrators" in "Group or user names:".

Select "Allow" for "Remote Access" in "Permissions for "Administrators".

Click "OK".

The "Security descriptor:" must be populated with "O:BAG:BAD:(A;;RC;;;BA) for the policy to be enforced.