SV-29282r1: The system is configured to allow unsolicited remote assistance offers. | Windows Vista Security Technical Implementation Guide

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Assessment Title

Rule Text

The system is configured to allow unsolicited remote assistance offers.

Description

Discussion Text

This setting controls whether unsolicited offers of help to this computer are allowed. The list of users allowed to offer remote assistance to this system is accessed by pressing the Helpers button.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001090CCE-3217-7

Additional Details

Mitigations

Remote Assist - Offer v2

Third-Party Tools

Mitigation Control

This is a documentable finding on workstations with the following mitigations. -Users must be trained to include the following: -Who they can accept assistance offer from. Offer must be in response to help desk request or confirmed with help desk if unsolicited offer comes through. -Users must know how to accept request, allow view or control, and how to disconnect a remote assistance session. -Users needs monitor the assistance activity at the workstation while it is occurring. -The support personnel allowed to offer assistance (helpers) must be limited and documented. -Port 3389 should be blocked at the perimeter to prevent other access. Accounts and groups authorized to offer remote assistance (helpers) are identified in the following registry key. Registry Hive: HKEY_LOCAL_MACHINE Subkey: \Software\Policies\Microsoft\Windows NT\Terminal Services\ RAUnsolicit\ Each Account or group will be listed under a separate value name with the value equaling the value name as in the following examples. Value Name: Administrators Type: REG_SZ Value: Administrators Value Name: TestUser Type: REG_SZ Value: TestUser

Responsibility

System Administrator

References

DPMS Target Windows Vista DISA DPMS Target Windows Vista 1029

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:476
# The system is configured to allow unsolicited remote assistance offers.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# registry_object (registry_test)
function test_1 {
  return ($null -ne (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows NT\Terminal Services' -Name 'fAllowUnsolicited'))
}
# registry_object (registry_test)
function test_2 {
  return ((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows NT\Terminal Services').GetValueKind('fAllowUnsolicited').ToString()]) -eq 'reg_dword')
}
# registry_object (registry_test)
function test_3 {
  return (-not ($null -ne (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows NT\Terminal Services' -Name 'fAllowUnsolicited')))
}
# registry_object (registry_test)
function test_4 {
  return (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows NT\Terminal Services' -Name 'fAllowUnsolicited' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'fAllowUnsolicited') -eq 0)
}
# registry_object (registry_test)
function test_5 {
  return (-not ($null -ne (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows NT\Terminal Services' -Name 'fAllowUnsolicited')))
}

if ((test_1 -and (test_2 -or test_3) -and (test_4 -or test_5))) {
  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_vista target this check assesses.

# OVAL Definition: oval:mil.disa.fso.windows:def:476
if (!(Test-Path -Path "HKLM:\Software\Policies\Microsoft\Windows NT\Terminal Services\fAllowUnsolicited" -ErrorAction SilentlyContinue) -or (Get-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\Windows NT\Terminal Services\fAllowUnsolicited" -ErrorAction SilentlyContinue).fAllowUnsolicited -eq 0) {exit 1} else {exit 0}

Remediation

Configure the system to prevent unsolicited remote assistance offers by setting the policy value for Computer
Configuration -> Administrative Templates -> System -> Remote Assistance “Offer Remote Assistance” to “Disabled”.