Bastion Host should disable shareable link

Medium Azure General bastionhosts-bastion-host-disable-shareable

Applies to

Microsoft.Network/bastionHosts

What CGPulse checks

A resource passes this rule when enableShareableLink must equal false. Anything else is reported as a finding with the evaluated property value attached as evidence.

How to fix it

Disable shareable links to prevent unauthenticated URL-based access to VMs. In Azure Portal: Bastion > Configuration > disable Shareable Link. See: https://learn.microsoft.com/en-us/azure/bastion/shareable-link

CLI

az network bastion update --ids "{id}" --enable-shareable-link false

Terraform

resource "azurerm_bastion_host" "{name}" {
  name                   = "{name}"
  resource_group_name    = "{rg}"
  location               = var.location
  sku                    = "Standard"
  shareable_link_enabled = false

  ip_configuration {
    name                 = "IpConf"
    subnet_id            = var.subnet_id
    public_ip_address_id = "<pip-id>"
  }
}

Compliance frameworks

Cloud Security: Azure Foundations

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