TMA-IIS-4.3

Ensure 'MaxQueryString request filter' is configured

BajaNivel 2Automatizadaiis

Descripción

The MaxQueryString Request Filter describes the upper limit on the length of the query string that the configured IIS server will allow for websites or applications. It is recommended that values always be established to limit the amount of data that can be accepted in the query string. requestLimits maxQueryString must be 2048 or lower at server level and for every site (default 2048). PowerShell 5.1 with the WebAdministration module; run elevated.

Cómo se verifica

Método de auditoría: Comando de shell

shell

Import-Module WebAdministration -ErrorAction Stop; $paths = @('MACHINE/WEBROOT/APPHOST') + @(Get-Website | ForEach-Object { "IIS:\Sites\$($_.Name)" }); $bad = @($paths | Where-Object { $c = Get-WebConfiguration -Filter 'system.webServer/security/requestFiltering/requestLimits' -PSPath $_; [long]$c.maxQueryString -gt 2048 }); if ($bad.Count -eq 0) { 'compliant' } else { 'noncompliant' }

Salida esperada: compliant

Cómo se corrige

Método de corrección: Guía o parche de infraestructura

Set-WebConfigurationProperty -PSPath 'MACHINE/WEBROOT/APPHOST' -Filter system.webServer/security/requestFiltering/requestLimits -Name maxQueryString -Value 2048

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: iisrequest-filtering
Referencia: CIS Microsoft IIS 10 Benchmark v1.2.1 - 4.3 Ensure 'MaxQueryString request filter' is configured

Verificar este host

Ejecute esto en un equipo que tenga permiso para auditar. El escaneo es de solo lectura.

shell

tmaegis scan --target iis --level 2