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Event Hub Namespace accepts insecure TLS versions#

Security · Event Hub · Rule · 2023_03 · Critical

Weak or deprecated transport protocols for client-server communication introduce security vulnerabilities.

Description#

The minimum version of TLS that Event Hub namespaces accept is configurable. Older TLS versions are no longer considered secure by industry standards, such as PCI DSS.

Azure lets you disable outdated protocols and require connections to use a minimum of TLS 1.2. By default, TLS 1.0, TLS 1.1, and TLS 1.2 is accepted.

When clients connect using an older version of TLS that is disabled, the connection will fail.

Recommendation#

Configure the minimum supported TLS version to be 1.2. Also consider enforcing this setting using Azure Policy.

Examples#

Configure with Azure template#

To deploy Event Hub namespaces that pass this rule:

  • Set the properties.minimumTlsVersion property to 1.2.

For example:

Azure Template snippet
{
  "type": "Microsoft.EventHub/namespaces",
  "apiVersion": "2024-01-01",
  "name": "[parameters('name')]",
  "location": "[parameters('location')]",
  "identity": {
    "type": "SystemAssigned"
  },
  "sku": {
    "name": "Standard"
  },
  "properties": {
    "disableLocalAuth": true,
    "minimumTlsVersion": "1.2",
    "publicNetworkAccess": "Disabled",
    "isAutoInflateEnabled": true,
    "maximumThroughputUnits": 10,
    "zoneRedundant": true
  }
}

Configure with Bicep#

To deploy Event Hub namespaces that pass this rule:

  • Set the properties.minimumTlsVersion property to 1.2.

For example:

Azure Bicep snippet
resource ns 'Microsoft.EventHub/namespaces@2024-01-01' = {
  name: name
  location: location
  identity: {
    type: 'SystemAssigned'
  }
  sku: {
    name: 'Standard'
  }
  properties: {
    disableLocalAuth: true
    minimumTlsVersion: '1.2'
    publicNetworkAccess: 'Disabled'
    isAutoInflateEnabled: true
    maximumThroughputUnits: 10
    zoneRedundant: true
  }
}

Configure with Azure Verified Modules

A pre-validated module supported by Microsoft is available from the Azure Bicep public registry. To reference the module, please use the following syntax:

br/public:avm/res/event-hub/namespace:<version>

To use the latest version:

br/public:avm/res/event-hub/namespace:0.9.1

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