Ensure 'maxURL request filter' is configured

FaibleNiveau 2Automatiséeiis

Description

The maxURL attribute of the <requestLimits> property is the maximum length (in Bytes) in which a requested URL can be (excluding query string) in order for IIS to accept. Configuring this Request Filter enables administrators to restrict the length of the requests that the server will accept. It is recommended that a limit be put on the length of URL. requestLimits maxUrl must be 4096 or lower at server level and for every site (default 4096). PowerShell 5.1 with the WebAdministration module; run elevated.

Méthode de vérification

Méthode d'audit: Commande 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.maxUrl -gt 4096 }); if ($bad.Count -eq 0) { 'compliant' } else { 'noncompliant' }

Sortie attendue: compliant

Méthode de correction

Méthode de correction: Recommandation ou correctif d'infrastructure

Set-WebConfigurationProperty -PSPath 'MACHINE/WEBROOT/APPHOST' -Filter system.webServer/security/requestFiltering/requestLimits -Name maxUrl -Value 4096

Propriétés

Systèmes d'exploitation: Tous
Étiquettes: iisrequest-filtering
Référence: CIS Microsoft IIS 10 Benchmark v1.2.1 - 4.2 Ensure 'maxURL request filter' is configured

Vérifier cet hôte

Exécutez cette commande sur une machine que vous êtes autorisé à auditer. L'analyse est en lecture seule.

shell

tmaegis scan --target iis --level 2