SV-25279r2: IPv6 TCP data retransmissions must be configured to prevent resources from becoming exhausted. | Windows 7 Security Technical Implementation Guide

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Assessment Title

Rule Text

IPv6 TCP data retransmissions must be configured to prevent resources from becoming exhausted.

Description

Discussion Text

Configuring Windows to limit the number of times that IPv6 TCP retransmits unacknowledged data segments before aborting the attempt helps prevent resources from becoming exhausted.

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

IA Controls

NIST SP 800-53

Not mappedCCI-002385CCE-9487-0

Additional Details

Responsibility

System Administrator

References

DPMS Target Windows 7 DISA DPMS Target Windows 7 1712

Checks

OVAL

oval:mil.disa.fso.windows:var:374900 ← xccdf_mil.disa.stig_value_MSS_tcp_max_data_retransmissions_ipv6_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:3749
# IPv6 TCP data retransmissions must be configured to prevent resources from becoming exhausted.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies 'MSS: (TcpMaxDataRetransmissions IPv6) How many times unacknowledged data is retransmitted (3 recommended, 5 is the default)' is set to 3 or less
# 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\Services\Tcpip6\Parameters').GetValueKind('TcpMaxDataRetransmissions').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip6\Parameters' -Name 'TcpMaxDataRetransmissions' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'TcpMaxDataRetransmissions') -le 3))
}

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.

# OVAL Definition: oval:mil.disa.fso.windows:def:3749
$regPath = "HKLM:\System\CurrentControlSet\Services\Tcpip6\Parameters"
$regKey = "TcpMaxDataRetransmissions"
if (Test-Path $regPath) { $regData = Get-ItemProperty $regPath\$regKey -ErrorAction SilentlyContinue; if ($regData -and $regData.PSObject.Properties.Value -le 3) { Write-Output "PASS"; exit 0 } }
Write-Output "FAIL"; exit 1

Remediation

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "MSS: (TcpMaxDataRetransmissions IPv6) How many times unacknowledged data is retransmitted (3 recommended, 5 is default)" to "3" or less.