Ensure custom error messages are not off

BajaNivel 2Automatizadaiis

Descripción

When an ASP.NET application fails and causes an HTTP/1.x 500 Internal Server Error, or a feature configuration (such as Request Filtering) prevents a page from being displayed, an error message will be generated. Administrators can choose whether or not the application should display a friendly message to the client, detailed error message to the client, or detailed error message to localhost only. customErrors mode must be RemoteOnly or On (not Off) in the root web.config and every site. PowerShell 5.1 with the WebAdministration module; run elevated.

Cómo se verifica

Método de auditoría: Comando de shell

shell

Import-Module WebAdministration -ErrorAction Stop; $paths = @('MACHINE/WEBROOT') + @(Get-Website | ForEach-Object { "IIS:\Sites\$($_.Name)" }); $bad = @($paths | Where-Object { $c = Get-WebConfiguration -Filter 'system.web/customErrors' -PSPath $_; [string]$c.mode -eq 'Off' }); 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/<site>' -Filter system.web/customErrors -Name mode -Value RemoteOnly

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: iisinformation-disclosure
Referencia: CIS Microsoft IIS 10 Benchmark v1.2.1 - 3.3 Ensure custom error messages are not off

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